CN103596657B - For the method and system filtered and cake layer is formed - Google Patents
For the method and system filtered and cake layer is formed Download PDFInfo
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- CN103596657B CN103596657B CN201280027655.7A CN201280027655A CN103596657B CN 103596657 B CN103596657 B CN 103596657B CN 201280027655 A CN201280027655 A CN 201280027655A CN 103596657 B CN103596657 B CN 103596657B
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- filter cake
- liquid
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- activated sludge
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- 235000012970 cakes Nutrition 0.000 title abstract description 13
- 239000012065 filter cake Substances 0.000 claims abstract description 285
- 239000007788 liquid Substances 0.000 claims abstract description 121
- 239000010802 sludge Substances 0.000 claims abstract description 101
- 239000007787 solid Substances 0.000 claims abstract description 76
- 239000002245 particle Substances 0.000 claims abstract description 75
- 238000007667 floating Methods 0.000 claims abstract description 43
- 239000008187 granular material Substances 0.000 claims abstract description 41
- 238000001914 filtration Methods 0.000 claims abstract description 36
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 42
- 239000000706 filtrate Substances 0.000 claims description 38
- 238000005429 turbidity Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000004062 sedimentation Methods 0.000 claims description 9
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- 239000000126 substance Substances 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 230000001112 coagulant Effects 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
- 238000000527 sonication Methods 0.000 claims description 3
- 241000894006 Bacteria Species 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 241000276438 Gadus morhua Species 0.000 claims 2
- 235000019516 cod Nutrition 0.000 claims 2
- 238000002156 mixing Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 abstract description 10
- 230000000903 blocking Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 239000002028 Biomass Substances 0.000 description 6
- 238000007906 compression Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
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- 230000001580 bacterial Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 201000005977 erythrokeratodermia variabilis Diseases 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
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Abstract
The present invention relates to the method for filtration feed and use the Waste Water Treatment of described filter method.Described method utilizes the filter cake for filtering, and wherein said filter cake is formed from by the composition in different for the described charging to be filtered liquid formed by being included in have.The method that the invention particularly relates to contain the liquid of various sizes of solid particle for bag filter, it utilizes the granuloplastic filter cake in the liquid at least partly and the most only comprising various sizes of solid particle described in being included in.The granule of described filter cake is deposited on filter cake supporter and described method includes being divided into the liquid comprising various sizes of solid particle two parts: the part of the solid particle comprising more than certain size and the part comprising less granule, and is comprised the part of smaller particle by described cake filtration.According to the preferred aspect of the present invention, by the described charging filtered, for activated sludge floating layer, described filter cake is formed by the flco of activated sludge mixed liquor.
Description
Invention field
The present invention relates to the method for filtration feed and use the Waste Water Treatment of described filter method.Described method utilizes
For the filter cake filtered, this filter cake is fractal by the one-tenth being included in from described charging to be filtered has in the different liquid formed
Become.The invention particularly relates to for the bag filter method of liquid containing various sizes of solid particle, its utilize at least partly and
Described in being included in, the most only comprise the granuloplastic filter cake in the liquid of various sizes of solid particle.Described filter cake
Grain is deposited on filter cake supporter and described method includes being divided into the liquid comprising various sizes of solid particle two parts:
A part comprises the solid particle of more than certain size, and a part comprises less granule, and by described cake filtration bag
Part containing smaller particle.According to the preferred aspect of the present invention, have described charging to be filtered be activated sludge floating layer and
Described filter cake is formed by the flco of activated sludge mixed liquor.
Background technology and the target of the present invention
It is known that the filter in the waste water treatment process carried out in such as membrane bioreactor (MBR) is led
Cause by the restricted in flow of described filter even without the dirty flowed and the puzzlement of the shortcoming of blocking.Filter generally by comprising
The film with the highest production cost the microfiltration with quite fragile filter design or ultrafiltration provide.Described Gao Sheng
Producing cost and be distinctly claimed the regeneration of described film, it is cleaned by back flush, chemistry or enzyme and provides.
Latest developments are (see the such as " spy of the self-forming Dynamic Membrane being combined with the bioreactor processed for municipal wastewater
Property (Characteristics of a Self-Forming Dynamic Membrane Coupled with a
Bioreactor for Municipal Waste water Treatment)”,Environ.Sci.Technol.2002,36,
5245-5251) show that the biomass layer on rough net improves solid-liquid separation.In proposed method, described biology
The thickness of matter layer constantly increases during filtering.In order to control to increase, bottom use, aeration constantly dissipates from surface and institute
State some solids of biomass layer and keep described thickness almost unchanged.The thickness of dirty layer on the membrane depends on many
Factor: slightly steep aeration rate, the geometry of filter module, Sludge Property etc., it is very difficult for therefore selecting optimum condition；Thing
In reality, described cake layer, or usual described biomass layer, almost spontaneously form, therefore its rejection ability (rejection
Capabilities) it is indefinite to a great extent.Equally, film slightly steeps the largest source of the running cost that aeration is MBR
One of, and film needs Chemical cleaning, and it is both costly and complicated.
In JP 2004167393, disclose the example of such Waste Water Treatment, it discloses wherein by using
Being placed in the bubbler below filter cell makes filter surfaces be exposed to bubble to keep described filter cell cleaning
System.
Therefore, the mode realizing the improvement that biomass retain in waste water treatment process will be favourable, the most more
Effective and/or filtration reliably will be favourable.
The further object of the present invention is to provide the substitute technology of prior art.Especially, it is provided that with the biology of compression
Matter realizes the new method solution device of problem of prior art mentioned above of film quality filtration, system and method is considered this
The target of invention.
Summary of the invention
Therefore, target as described above and other several targets are contemplated by the different aspect of the present invention and obtain, its
The method that first aspect relates to the bag filter liquid containing various sizes of solid particle.Described method utilizes at least partly
And the most only by the granuloplastic filter cake being included in the liquid comprising various sizes of solid particle, and these solids
Grain is deposited on the filter cake supporter of the porous member as porous layer and forms described filter cake.Described filter cake and supporter allow liquid
Body flows through described filter cake to provide filtrate, and described method includes
-the described liquid comprising various sizes of solid particle is divided into two parts: the solid comprising more than certain size
One part of granule, comprises a part of less granule, and
-provide the part including smaller particle with the direction towards and through filter cake supporter (4) towards and through described
The flowing of filter cake (18), thus the filtration of the part comprising less solid particle is provided.
In the present context, many terms use in the way of routine to those skilled in the art.But, these arts
Some in language are explained as follows:
Various sizes of solid particle is preferred for meaning that size is from about 1 micron (single bacterial cell) to more than 1 millimeter
The granule of the activated sludge mixed liquor of (polymer of active pollution index, big inorganic particle).Described " size " generally with
Mode conventional for the definition of particle size uses, and represents such as particle size based on volume the most in a conventional manner
Diameter, it is equal to the diameter of the spheroid identical with given particle volume." granule " is preferred for including that activated sludge is wadded a quilt with cotton
Body and its aggregation and other solid constituent being present in fluid.Solid is preferred for meaning not to be the thing of liquid or gas
Matter.
Porous is preferred for meaning if applying pressure is poor, it is allowed to the material property that fluid passes through.
Certain size is preferred for meaning that the short grained activity that its sedimentation is significantly faster than that in activated sludge floating layer is dirty above
Larger particles in sludge mixed material liquid.But the restriction of " certain size " generally and is preferably defined by such as isolation technics,
Such as produce district's otherwise between sedimentation and non-sedimented particle, can limit described in preliminary election.It is typically used for the value of described restriction
Can be 10 microns.
Active pollution index is preferred for meaning that the microorganism forming most of activated sludge mixed liquor suspended solid gathers
Collection thing.Additionally active pollution index is also, it is preferred that be used for meaning by antibacterial, protista with by by poly-outside bacteriogenic born of the same parents
Compound matter combines that other granule of (as glue) is made, form described activated sludge mixed liquor can subsidence part
The bacterial polymer divided.
Activated sludge mixed liquor is preferred for meaning to be present in performing what waste water processed according to described activated sludge process
Active pollution index in one or more process tanks of device and the mixture of activated sludge floating layer.Therefore, activated sludge mixes
Close feed liquid and be preferably liquid (usually water) and the mixture of biological floe block.
Activated sludge floating layer is preferred for meaning that remaining described activated sludge mixes after described active pollution index settles
Close the top section of feed liquid, comprise the granule that can not settle and a small amount of active pollution index.Generally and preferably carry out described sedimentation
Until the top section of activated sludge floating layer is it will be evident that as the most obvious.Therefore, activated sludge floating layer is preferably by living
Property mud mixed liquor sedimentation, centrifugal or be generally separated, be such as included in described activated sludge mixed liquor by separating out
Flco and/or other solid constituent and the aqueous phase that produces.Described separation provides the floor portions of activated sludge mixed liquor,
It is characterized in that having than unsegregated activated sludge mixed liquor higher flco concentration.
Filter cake granule removal mechanisms at work is preferred for the mechanism meaning to be removed particle-removing by filter cake.Such filter cake is generally by energy
Enough active pollution index compositions being removed the granule being present in activated sludge floating layer by in-depth filtration technique.From described activity
The little granule of mud floating layer enters porous filter cake and is adsorbed in the surface of the active pollution index forming described filter cake.These
The absorption of grain causes reducing and the increase of the pressure drop through described filter cake therefore of the internal porosity of described filter cake.Through institute
State the Progressive symmetric erythrokeratodermia of filter cake caused by the compressed state of active pollution index described in the pressure drop the most also reason of filter cake to cave in and increase
Add (referring also to this paper Fig. 3).
Generally, described filter cake is preferably passed through granule on filter cake supporter by the liquid comprising various sizes of solid particle
Deposition make.In this respect, granule typically refers to described granule from liquid deposition and is initially contained in described fluid and from institute
State fluid and " move " position to described filter cake supporter.
In a preferred embodiment of the invention, described filter cake can be by the portion of the liquid comprising various sizes of solid particle
Point being made by granule deposition on filter cake supporter, it comprises the solid particle of more than certain size.
The described liquid comprising various sizes of solid particle is preferably activated sludge mixed liquor, including smaller particle
Part be preferably activated sludge floating layer, and wherein more than certain size solid particle is preferably wadded a quilt with cotton for activated sludge
Body.Further, the liquid comprising various sizes of solid particle can be the most untreated waste water.
In preferred embodiments, described activated sludge mixed liquor is preferably to process technique from biological wastewater
Activated sludge mixed liquor.
Further, described activated sludge floating layer can be preferably processed municipal administration by sedimentation activated sludge mixed liquor
Or the municipal administration of biological processes or industrial wastewater present in the system of industrial wastewater, provide.
Described filter cake is preferably provided by the flco being included in described activated sludge mixed liquor and implements at some
Scheme is also provided by the material of the condensation provided by adding coagulant in described mud.In some embodiments,
Described filter cake can only be provided, although the invention is not limited in this feelings by the flco from described activated sludge mixed liquor
Condition.
In preferred embodiments, described filter cake can be formed on the backing layer on described filter cake supporter.Described backing layer
Preferably include there is permission filtrate by allowing filter cake the accumulation paper in aperture of (build-up), net or the like simultaneously, and
And wherein said filter cake removes together with described backing layer.
The method according to the invention can farther include the removal of described filter cake.This removal preferably includes providing liquid
By filter cake supporter towards the flow step of filter cake (18), it removes filter cake from described filter cake supporter under many circumstances.
The removal of filter cake or its residue can farther include mechanism such as scraping, chemical action, bubbly flow, heat work
With, use ultrasonic Sonication or be intended to from above support separate described filter cake any other method remove.
The method according to the invention can farther include to be back to comprise activated sludge mixed liquor by the filter cake removed
Or in the process tank of the fluid usually comprising different size solid particle.
The preferred embodiments of the invention farther include the foundation of described filter cake and described foundation preferably includes carrying
Supply
-liquid is to the flowing of described filter cake supporter, and described liquid is liquid or the bag comprising different size solid particle
Containing the part of solid particle more than certain size,
-through described filter cake supporter and when time deposited thereon the pressure differential of described flco, to provide liquid to pass through institute
State filter cake supporter and the flowing of flco deposited thereon；Until filter cake has been formed.
Setting up filter cake and can farther include by comprising before the described partial flushing filter cake of smaller particle according to the present invention
Region thus remove filter cake set up during use liquid.
Filter cake set up during through described filter cake supporter and when time deposited thereon the pressure differential of described flco can be 1
Under Palestine and Israel, under 0.5 Palestine and Israel, even below 0.1 bar, and more preferably between 0 to 200 millibars.Currently preferred
In embodiment, the described pressure differential during filter cake is set up changes according to concrete attribute, such as to allow through mistake
The flowing of filter support is constant during filter cake is set up.
According to the preferred embodiments of the invention, the described pressure differential during filter cake is set up can be the most constant, or
During filter cake is set up, liquid is the most constant by the flowing of described filter cake and filter cake supporter, or flows and the equal root of pressure
Change over according to predefined overview.
Preferably, when the solid masses of the per unit area of described filter cake supporter has reached the level of preliminary election, definable
For having formed described filter cake.According to the preferred embodiments of the invention, the level of described preliminary election can arrive at every square metre 0.05
Select within the scope of 10kg dry solid.
In other embodiments, during filter cake is set up, described filter cake supporter is passed and described in when time deposited thereon
The pressure differential of flco increases in time.Preferably, when described pressure differential has reached the level of preliminary election, may be defined as having formed institute
State filter cake.
The preferred embodiments of the invention can farther include to measure has passed through described filter cake supporter or described filter cake
One or more parameters of liquid, such as turbidity, suspended sediment concentration, total count of bacteria, organic carbon concentration, chemical oxygen demand
Amount (COD), described mensuration is by measuring and/or having calculated.
Preferably, described method can further include at it and have been used for the bag filter described part containing less solid particle
The described filter cake of rear capture or its granule.After it has been used, the filter cake of capture represents mud the therefore present invention offer of dehydration
Dewatered sludge and the effect that the filter cake that used is removed as superfluous activated sludge from Waste Water Treatment.
In many preferred embodiments, the method for filtration includes that following circulation repeats:
The foundation of-filter cake,
-comprise the filtration of part of less solid particle, and
The removal of-described filter cake.
In second aspect, the present invention forms a part for method of wastewater treatment.
In the third aspect, present invention is preferably related to include following filtration system:
-for accommodating the process tank of the liquid comprising various sizes of solid particle,
-for receive from the liquid of described process tank and the liquid comprising various sizes of solid particle is divided into
The separative element of lower part: the part of the solid particle comprising more than certain size and the part comprising smaller particle, and
-there is the filter element of two chambers and allow liquid only to pass through filter cake supporter and filter cake at said two chamber
Between flowing porous filter cake supporter,
Described filtration system farther includes:
-for feeding liquid and/or the bag comprising different size solid particle to the same chamber of described filter element
The liquid connecting line of the part containing solid particle more than certain size,
-control valve, control to have to be filtered as described in liquid, comprise part or the bag of the solid particle of more than certain size
Whether the part containing smaller particle is fed to the pass valve closing of the described chamber of filter element.
In preferred embodiments, comprise the liquid of various sizes of solid particle can be activated sludge mixed liquor also
And said two part can be activated sludge mixed liquor and the activated sludge floating layer with higher concentration.
Described system can further include at the backing layer on filter cake supporter, and described backing layer preferably includes have permission filtrate
By the paper in aperture allowing filter cake to gather, net or the like simultaneously.
As presented hereinbefore, the liquid comprising various sizes of solid particle is typically divided into lower part: comprise one
The part of solid particle more than sizing and the part comprising less solid particle.In many preferred embodiments, this
Two parts are only two parts that described liquid is separated, although described liquid can be separated into other part.This
It is described in the other embodiments of invention disclosure below and in claim.
Various aspects of the invention can each combine with any other side.With reference to hereinafter describe embodiments, this
These and other aspect of invention will be apparent to and be illustrated.
Brief description
It is more fully described the present invention and particularly preferred embodiment thereof now with reference to accompanying drawing.The display of described accompanying drawing is real
Execute the mode of the present invention, and be not construed as limiting other the possible embodiment party fallen within the scope of appended claims
Case.
Fig. 1 illustrates and shows the enforcement according to the present invention,
Fig. 2 a and b each diagram shows that display pressure P, flow Q and filter cake amount ω on dry basis are (with per unit area
Kilogram meter filter cake dry weight measure) (kg/m2) overview.Overview set up by the filter cake of Fig. 2 a display constant voltage mode and Fig. 2 b shows
By the constant current mode overview of described filter cake during filter cake foundation.
Fig. 3 illustrates strobe utility and the blocking of display filter cake 18.
The granule density that Fig. 4 illustrates in display pressure P, flow Q, filtrate (is designated as Cf) overview.Fig. 4 particularly illustrates it
Middle filter cake is designed (designed) (building (engineered)) and necessarily retrains (at C for meeting in the quality of filtratefIn figure
Be designated as vertical dotted line) embodiment of the present invention.
Fig. 5 a shows about separating and filtering a kind of operator scheme that especially biomass separate and filter,
Fig. 5 b shows about separating and filtering a kind of operator scheme that especially biomass separate and filter,
Fig. 6 shows the exemplary cake filtration technique fortune carried out with the flow of 700LMH (liter per hour every square metre)
OK.
Specific embodiments
Enforcement now with reference to the open present invention of Fig. 1.It should be noted that enforcement disclosed herein relates to the present invention
Embodiment and be not construed as limit the scope of the present invention.
Fig. 1 discloses Waste Water Treatment I by way of illustration.Described system I includes process tank 1, separative element 2, filters
Unit 3 and filtrate tank 7.
Waste water such as municipal administration or industrial wastewater are carried out a biological disposal upon in process tank 1, and therefore activated sludge mixed liquor goes out
Now in described tank 1.Described activated sludge mixed liquor can be by using the liquid between described process tank 1 and separative element 2
Pump 9 on connecting line 33 flows to separative element 2.The described flowing entering separative element 2 can be cut off by using valve 12.Described
Liquid connecting line 33 includes and the bifurcation 34 of the connecting line 25 with valve 16.Described liquid connecting line 25 is by using pump 9
Activated sludge mixed liquor can be made to flow to the chamber 5 of filter element 3.Activated sludge mixed liquor is to the inflow of filter element 3
Can cut off by using pass valve closing 16.
Separative element 2 is typically embodied as settling tank, and wherein said activated sludge mixed liquor has relatively by settling into
The activated sludge mixed liquor of high concentration flco floats with having the activated sludge above the activated sludge mixed liquor of higher concentration
Layer and separate.Merit attention, although the embodiment of Fig. 1 uses the isolation technics relating to sedimentation, but can also apply
Other isolation technics such as centrifugal, filtration etc..
Therefore, embodiment disclosed in Fig. 1 relates to wherein comprising the liquid of different size solid particle for being comprised in
State the embodiment of activated sludge mixed liquor in process tank.And, described in comprise different size solid particle liquid pass through
Described separative element 2 is divided into two parts:
Comprising the part of the solid particle of more than certain size, it is to be produced in separative element 2 by sedimentation process
And by the activated sludge mixed liquor thickened of fluid line connector 32 returning charge to process tank 1,
Comprising the part of less solid particle, it is produced by sedimentation process and is fed to by fluid line connector 31
The activated sludge floating layer of filter element.
Filter element 3 be embodied as having the inside of described filter element 3 is divided into accept activated sludge mixed liquor or
The chamber 5 of activated sludge floating layer (will be the most specifically disclosed by liquid connecting line 31) and accept by as described in filter
The container of the filter cake supporter 4 of the chamber 6 of the filtrate of the filter cake 18 formed on cake supporter 4.Merit attention, will be by filter
Cake supporter 4 also enters the liquid of chamber 6 and is referred to as filtrate, and no matter whether filter cake 18 is present on filter cake supporter 4.Chamber 5 He
Pressure differential between chamber 6 can be measured by pressure transducer 17.
Filter cake supporter 4 is porous member, and its porosity is supported to keep by by framework or similar supporting construction
The net that net stretches provides.Described net can be to provide to allow the opening of liquid communication to prevent what flco and/or granule from passing through to knit simultaneously
Thing net, metal mesh shaped thing or the like.Therefore, described net has and be enough to stop the granule of certain size and/or flco to pass through
Size of mesh.Described size of mesh preferably 1-100 micron is multiplied by the magnitude of 1-100 micron, and described network optimization choosing is made
For the fabric produced by paper, synthesis or natural fiber or metal or non-woven, such as stainless (steel) wire net.Additionally, described filter cake
Supporter 4 can be provided by the structure with coarse grid and described in the size of mesh that be enough to stop granule and/or flco to pass through lead to
Cross and dispose backing layer to provide in coarse grid structure.Described backing layer preferably includes have permission filtrate by allowing filter cake to gather simultaneously
The paper in aperture, net or the like.
Two outlets 13 and 14 each with pass valve closing are provided by chamber 5.Described outlet 13 is by liquid connecting line 26
It is connected to process tank 1 so that liquid can flow into process tank 1 from chamber 5.Described outlet 14 is connected to store by liquid connecting line 27
Pond 20 (being commonly used for storing the cistern of liquid) is so that liquid can flow into cistern 20 from chamber 5.
Liquid connecting line 28 between chamber 6 and filtrate tank 7 is provided.Described liquid connecting line 28 includes three-way valve 15, borrows
This filtrate can flow to three-way valve 15 from chamber 6, and it guides filtrate enter filtrate tank 7 or returned by liquid connecting line 29
Purpose to process tank 1 three-way valve 15 will disclose in more detail below.The amount of the filtrate of outflow filter unit 3 is passed through
Effusion meter 21 measures, and the turbidity of described filtrate is provided by turbidity transducer 19.Merit attention, described effusion meter 21 He
The position of turbidity transducer 19 may select and is different from the shown liquid connecting line 28 between filter element 3 and three-way valve 15
On position.In addition to three-way valve 15, liquid connecting line 28 farther include the pass valve closing 23 being in three-way valve 15 upstream with
Stop backflow, say, that liquid is flowed to by liquid connecting line 28 from filtrate tank 7 or process tank 1 (via liquid connecting line 29)
The chamber 6 of filter element 3.Described pass valve closing 23 is proportioning valve (or adjustable valve of other kind) and right by control system 8
Its ratio and its degree of opening are controlled；As will the most more specific disclosed in, when utilizing, constant current or constant voltage are general
During condition, in the foundation of filter cake 18, generally use the specific function of proportioning valve 23.
Filtrate tank 7 includes the liquid connecting line 30 between the chamber 6 of filtrate tank 7 and filter element 3 with pump 11, filters whereby
Filtrate in flow container 7 can flow to chamber 6.Liquid connecting line 30 farther includes to avoid the pass valve closing 24 of backflow, say, that liquid
Body flows to filtrate tank 7 from chamber 6 by liquid connecting line 30.The purpose making liquid retract chamber 6 will be disclosed below.
The liquid connecting line 31 including pump 10 floating layer will produce in separative element 2 or the compound of high concentration are provided
Liquid feeds the chamber 5 to filter element 3.Described liquid connecting line 31 farther includes to stop the pass valve closing 22 of backflow, namely
Say that liquid is flowed to separative element 2 by described liquid connecting line 31 from chamber 5.
Outlet at the separative element 2 for discharging the activated sludge mixed liquor being included in separative element 2 provides liquid
Connecting line 32.Described liquid connecting line 32 connects separative element 2 with process tank 1 so that the activated sludge mixed liquor of higher concentration
Can be by single liquid connecting line (not showing in Fig. 1) or by connecting the outlet of the separative element of activated sludge mixed liquor
The liquid connecting line 32 (as shown in Figure 1) being connected 29 with liquid flows to process tank 1.Activated sludge floating layer at separative element 2
Thicken and will occur and described liquid connecting line 32 is typically designed to and performs the activated sludge mixed liquor that thickens and returns tank 1
Transport.This liquid is referred to as returning activated sludge mixed liquor (RAS).
Liquid connecting line between cells is typically embodied as pipeline and liquid flowing between cells by controlling
The control system 8 of pump 9,10 and 11 and valve 12,13,14,15,16,22,23,24 controls.It addition, from pressure transducer
17, the reading of effusion meter 21 and turbidity transducer 19 is received by described control system 8 and is used in the control of system I.
Although above disclosure focus on the parts of described system and liquid by and flow between the components
Probability, but described system generally operates with three phases (A, B and C refer to the stage that Fig. 2 a and b shows respectively):
The foundation of A filter cake
The filtration of B floating layer
The removal of C filter cake
Each in these stages be will be described in further detail now.
The foundation of A: filter cake
Activated sludge mixed liquor by pump 9 from process tank 1 via liquid connecting line 33 and 25 and pass through valve 16 and (opening
Put state) pump into chamber 5.In the meantime, valve is in following state:
| Valve | 12 | 13 | 14 | 15 | 16 | 22 | 23 | 24 |
| State | Close | Open | Close | To 1 | Open | Close | Close | Close |
The active sludge intermixture that this configuration provides of valve enters the flowing of chamber 5.When chamber 5 is mixed by activated sludge
Close feed liquid when being completely filled with, valve be set to following state:
| Valve | 12 | 13 | 14 | 15 | 16 | 22 | 23 | 24 |
| State | Close | Close | Close | To 1 | Open | Close | Regulation | Close |
From process tank 1, activated sludge mixed liquor is pumped into chamber 5 with pump 9 and to discharge the unique channel of pressure be liquid warp
Filter cake supporter 4 is also overflowed by liquid connecting line 28 and valve 23.Sufficiently large stay the flco on filter cake supporter with heavy
Form filter cake 18.Valve 23 can be 100% open, and then filter cake is set up and carried out according to constant voltage mode, and wherein pressure is determined by pump 9.
Or, valve can be regulated by control system 8 by reading based on effusion meter 21, in order to when the thickness of filter cake 18 increases and produces more
Water resistance time, valve 23 gradually opens to maintain by the constant flow of filter cake supporter 4.When filter cake passes achieved with by pressure
During the preferable thickness that sensor 17 shows indirectly, process terminates.
By pressure differential and the performance of fixing fabric structure filter cake 18 of the liquid of the open discharge of filter cake supporter 4, and by
Differential pressure pick-up 17 and effusion meter 21 are monitored.When pressure differential reaches instruction achieved with preferable filter cake thickness and the preset value of performance
Time, valve 13 is opened and the activated sludge mixed liquor of excess flows into chamber by valve 22 and liquid connecting line 31 because of floating layer
5 and discharge chamber 5 and return into process tank 1.Therefore, at the end of filter cake establishment model, valve is in following state:
| Valve | 12 | 13 | 14 | 15 | 16 | 22 | 23 | 24 |
| State | Open | Open | Close | To 1 | Close | Open | Close | Close |
Although disclosure above focuses on wherein by the granule comprised in the activated sludge mixed liquor in process tank 1
Deposition prepare the operator scheme of filter cake 18, but filter cake can also be by the return being left knockout drum 2 by liquid connecting line 32
Prepared by the deposition of the granule comprised in activated sludge mixed liquor (RAS).This diagram is disclosed in Fig. 5 b.In this kind of embodiment
In, liquid connecting line disclosed in Fig. 1 is altered to described return activated sludge mixed liquor can be fed to filter element 3
Chamber 5.
The filtration of B: floating layer
Being filtered through of activated sludge floating layer is aspirated activated sludge floating layer by means of pump 10 from separative element 2 and is passed through filter cake
18 occur.The quality of filtrate is monitored by turbidity transducer 19.If quality is acceptable, generally mean that turbidity compares present count
Little, then described filtrate is directly entered filtrate tank 7 by three-way valve 15.If quality is unacceptable, then described filtrate
It is directly entered process tank 1 by three-way valve 15.Therefore, the valve during filtered model is in following state:
| Valve | 12 | 13 | 14 | 15 | 16 | 22 | 23 | 24 |
| State | Open | Close | Close | - | Close | Open | Open | Close |
The removal of C: filter cake
During floating layer filtration stage, the granule comprised in described floating layer will blocking filter cake 18.Along with through filter cake 18
The increase of pressure differential, detects the blocking of filter cake.If proceeding to filter, the blocking of filter cake 18 will not be flowed as final result
Move or flow through filter cake 18 generally without liquid.In many cases, the result of blocking is that pressure buildup is quickly also with regard to described system
System uses up pump discharge to produce the limit reaching system for bigger pressure, or compressed too hard of filter cake 18 to such an extent as to remove
It becomes extremely difficult.
Therefore, when reaching preset level through the pressure differential of filter cake 18, filtration stage terminates and removes the rank of filter cake
Section starts.Change the first scheme in filter cake stage to include removing the filter cake 18 being present on filter cake supporter 4.This is by using pump
11 aspirate filtrate from filtrate tank 7 completes to the chamber 6 of filter element 3.During this first scheme, valve is in following
State:
| Valve | 12 | 13 | 14 | 15 | 16 | 22 | 23 | 24 |
| State | Close | Open | Close | To 7 | Close | Close | Close | Open |
Then aspirate filtrate by pump 11 from filtrate tank 7 and enter the chamber 6 of filter element 3 and generate by filter cake 18 and filter
The flowing of cake supporter 4 and through filter cake 18 and the pressure differential of filter cake supporter 4, separates filter cake from filter cake supporter 4.Then institute
The filter cake of release comes through valve 13 and returns process tank 1 (as shown above) or enter described cistern by valve 14
To be further processed as superfluous mud.
Therefore, removing of filter cake 18 generally passes through to be characterized by including that the most reverse liquid flows back
The mode washed is carried out.Replace this removal (or in combination), filter cake 18 or its residual components such as can be scraped by mechanism
Sonication that wiping, chemical action, heat effect, use are ultrasonic or other remove.
Once filter cake is removed, and is at filter cake supporter 4 by establishment stage (as described above) result of execution filter cake 18
The filter cake that upper foundation is new.
When filter cake is established, perform floating layer filtration stage until re-starting the replacing of filter cake.Therefore, filter usual leading to
The circulation crossing following phases repeats to carry out: the foundation of filter cake, the filtration of floating layer and the removal of filter cake.
Fig. 2 a and b illustrates respectively and shows through filter cake 18 (when it is present) and the pressure P of filter cake supporter 4, by filter
Cake 18 (when it is present) and the flow Q of filter cake supporter 4 and filter cake amount ω on dry basis (by per unit area kilogram in terms of
Filter cake dry weight measure) (kg/m2) overview.In this context, the amount of dry refers to the wadding being deposited on filter cake supporter 4
The content of body.Fig. 2 a display filter cake set up during the overview of constant voltage mode and Fig. 2 b display filter cake set up during constant current mode
Overview.Amount ω that it should be noted that filter cake dry can indirect reformer be filter cake thickness.Fig. 2 a and b is only two realities
Executing example, pressure and flow all to change according to specific overview, any combination the most therebetween is all can
Can.
As disclosed in Fig. 2 a, during filter cake establishment model A, the volume flow Q of filtrate subtracts as the function of time
Little.Meanwhile, pressure differential P through filter cake supporter 4 and filter cake 18 (when being established) keeps constant.This sets up owing to filter cake
Mode, namely by operation pump 9 with activated sludge mixed liquor filled chamber 5 and by activated sludge floating layer feed to chamber
5.Along with flowing and increasing active pollution index is deposited on filter cake supporter 4 to chamber 6 due to liquid, it is deposited on filter
The amount increase of the dry on cake supporter 4 causes the flow resistance in filter cake 18 to increase.Because pressure remained constant, so
Volume flow Q declines in time.When filter cake amount reaches predefined level, filter cake establishment stage A terminates and filtration stage B opens
Begin.
During filtration stage B, operation pump 10 is to provide the steady flow to chamber of the mixed liquor floating layer and thus filtrate
Leave the steady flow of chamber 6.During filtered model, the granule comprised in mixed liquor floating layer is filtered off in filter cake 18 and sinks
Amass in filter cake 18.The cumulative blocking of filter cake 18 adds filter cake 18 and the pressure differential on filter cake supporter 4, and it shows at Fig. 2 a
It is shown as increasing considerably of at the end of filtered model B pressure P.Generally the terminal of filtered model B is chosen as when pressure P arrives
During certain predefined level.
After floating layer filtration stage B terminates, start filter cake and remove C.This is comprised and is propped up by filter cake as disclosed
Being inverted such that by passing through the effect of the liquid that filter cake supporter 4 flows from filter cake from chamber 6 to chamber 5 of the flowing of support thing
Supporter 4 removes filter cake 18.In fig. 2 a, this reverse flow is shown as negative fluid flow Q, reverse pressure differential and deposition
The minimizing of the dry ω on filter cake supporter 4.It should be noted that generally, be deposited on the dry on filter cake supporter 4
Amount not by directly measuring and carry out filter cake displacement when pressure differential P reaches certain level such as less than 10 millibars
The termination of C.Noticing that back scrubbing filter cake is only the one from supporter is removed filter cake and cleaned numerous approach of supporter (can
Apply other technology any) it is critically important.
It is similar to Fig. 2 a, Fig. 2 b and also show each stage A, B and C.But, with the operating system schema of display in Fig. 2 a
On the contrary, the operation of the system in Fig. 2 b contains the constant flow velocity during filter cake establishment model A.This constant flow rate is by operation
Pump 9 provides, in order to produces pressure differential P being gradually increased as shown in Mode A in Fig. 2 b and (or maintains the constant speed of pump 9 and tune
Joint valve 23).Result compared with the embodiment of Fig. 2 a is deposited on the growth speed of the amount of the dry on filter cake supporter 4
Degree is different.In Fig. 2 a (constant voltage), deposition velocity time function changes, but heavy as flow constant (Fig. 2 b)
Long-pending speed time function is almost unchanged.
In figure 3, it is illustrated that disclose to property strobe utility and the blocking of filter cake 18.Be deposited on filter cake supporter 4 is dry
Material i.e. active pollution index is shown as and will be filtered through the relatively small component 37 comprised in the activated sludge floating layer of filter cake 18
The bigger composition 36 compared.Activated sludge floating layer towards and by filter cake 18 flow during, and when filter cake 18 be porous
During component, some less granules by the space being trapped between described flco 36 surface being adsorbed to them, and some
Will be by filter cake 18.It is desirable that all of less granule will be trapped in filter cake.The amount of stranded granule 37 depends on filter cake
Thickness and the porosity of filter cake 18 and be possibly also dependent on whether filter cake 18 is compressed；The compression of filter cake 18 can be by increasing
Pressure differential on filter cake and filter cake supporter is carried out.
Therefore, the filter cake 18 being made up of active pollution index can be removed by depth-type filtration technique and be present in activated sludge
The granule of floating layer.Little granule 37 from activated sludge floating layer enters the filter cake 18 of porous and is adsorbed to be formed the work of filter cake 18
The surface of property mud flco.The reduction being adsorbed with the internal porosity helping filter cake of these granules also hence helps to through filter cake
The increase of the pressure drop of 18.The filter cake caused through the compressibility of the pressure drop P also reason active pollution index of filter cake 18
Progressive symmetric erythrokeratodermia caves in and increases.
(i.e. the concentration of granule in filtrate, is designated as C to the quality of the filtrate produced during filtration stage in the diagramf) can join
Machine is monitored and controlled.Turbidity transducer is a kind of approach obtaining online quality measurement.
Constraint to filtrate quality (being represented the Cmax of granule in filtrate in the diagram by horizontal dotted line) can be set
(as being less than 1NTU, maybe when the solid concentration suspended is less than 1mg/L when turbidity), and meet the approach of described constraint for passing through
Increasing by the flow velocity of filter cake, according to specific attribute compression filter cake (little by little or step-by-step movement), it will cause through filter cake
Gradually (or step-by-step movement) of pressure drop increases.The porosity increased changing filter cake 18 of this pressure drop, and therefore increase it
The efficiency of particle-removing is gone from charging.When having met described quality constraints, can be returned to initially by the flow velocity (flow) of filter cake
It is worth owing to quality described in the height irreversibility of compression process will keep higher.Described result will be also the pressure by filter cake
Power general who has surrendered is higher than initial value before compression.
The method and system of the present invention presents favourable self-regeneration effect.If during described establishment stage, filter
The part of cake 18 is removed, reduces or the most no longer formed the part of filter cake 18, then selfreparing mechanism will occur.As
Really the part of filter cake 18 is being lost, then the shortage at the flco of that part of filter cake 18 will cause obtaining having less water resistance
The regional area of the filter cake 18 of power, trends towards attracting to cause described flco to be deposited on the liquid of flco to such region
Described region thus with flco fill described region to re-establish filter cake 18.This hole in cake will be as two chambers 5
And the pressure drop between 6 reduce the liquid turbidity sensing via pressure transducer and the increase measured by turbidity induction apparatus 19
Arrive.If big infiltration being detected in operation (filtration stage) period, activated sludge mixed liquor can be given to repair and perfect
Described filter cake.
Fig. 5 a with b shows two kinds of different operator schemes of the preferred embodiments of the invention.In Figure 5, such as this area
Technical staff is conventional use of, by have connect two angles line cuboid display filter (i.e. filter cake supporter (4) and
The combination of filter cake (18)), and described filter cake 18 preferably by be present in return activated sludge (i.e. there is the compound of higher concentration
Liquid, such as when leaving separative element 2 by liquid connecting line 32) or from the activated sludge mixed liquor of process tank 1
Active pollution index provides.Fig. 5 a and 5b further include at activated sludge floating layer by filter cake 8 replace before separate out solid and/or
The equipment of other solid constituent being included in described mud.
Fig. 5 a shows that the formation of wherein filter cake (18) is completed by activated sludge mixed liquor, say, that filter cake 18 is by granule
From liquid being filtered being deposited on filter cake supporter (4) operator scheme prepared.Before filtration, described activated sludge
Mixed liquor is divided into two parts: be designated as part and the mark of the mixed liquor (return activated sludge) comprising higher concentration of RAS
Non-sedimented particle and the part of water processed is comprised for activated sludge floating layer.Therefore it provides two parts: comprise a scale
The part of very little above solid particle (RAS) and the part comprising less solid particle (activated sludge floating layer).For filtering, only
Activated sludge floating layer is moved through filter cake 18, and RAS is then moved back into the region that wherein biodegradation occurs.
The another kind of operator scheme 3 of Fig. 5 b display, wherein mud is divided into two parts: the solid comprising more than certain size
The part of grain (RAS) and the part comprising less solid particle (activated sludge floating layer).Only RAS is moved toward filter cell 5
For forming filter cake 18.Activated sludge floating layer is moved back into region that wherein biodegradation occurs or is moved into separation chamber and (does not shows
Show).For filtering, only activated sludge floating layer is moved through filter cake 18, and RAS is then moved back into the region that wherein biodegradation occurs
(process tank 1).
In addition to forming filter cake 18 from active pollution index, filter cake 18 also can be by by adding to activated sludge mixed liquor
The material of the condensation that coagulant provides is formed.The combination of the material of active pollution index and condensation is used for forming filter cake also can be at this
Within the scope of invention.
Sludge dewatering
In addition the invention provides and the probability of dehydration activity mud in (setup) is set above-disclosed filtration.Especially
The valve 14 of its design drawing 1 and cistern 20 are for removing and having been loaded into granule the use compressed during capture operation
Filter cake 18.If used filter cake is captured rather than the material of used filter cake 18 is sent into process tank 1, then logical
Often filter cake 18 is compressed and solidify so that it water content with can be at sludge dewatering unit such as belt press, pressure filter and centrifuge
Middle acquisition similar, the auxiliary that may be no longer needed for sludge dewatering whereby in the system according to the present invention and invention sets
Standby.
Result of the test
During filter cake 18 is set up, the pressure differential through filter cake supporter 4 with the solid particle being deposited on generally arrives 0
Between 200 millibars and during operation through the pressure differential generally up to 200 millibars of filter cake 18 and filter cake supporter 4.But,
Stress level is usually set the limit and is probably different.But, the stress level in 1 Palestine and Israel there is presently no and finds it
Reasonability.
The flow that realizes (being flowed the area divided by filter cake by the liquid of filter cake) (rises every 100 to 2000-3000LMH
Hour every square metre) in the range of.It has been found that higher flow causes the shorter filter cake life-span (in blocking to promoting replacing
Life-span before degree).Filter cake 18 usual survival 5-15 minute (high flow capacity, such as 1500-2000LMH) to a few hours (as
300LMH 5 hours), it has also been observed that it depends on the granule density in sludge characteristics and floating layer.
Fig. 6 shows the exemplary cake filtration technique fortune carried out with the flow of 700LMH (liter per hour every square metre)
OK.Embodiment shown in described cake filtration process operation Fig. 1 is carried out.In order to follow the trail of raising filter cake in terms of granule removal
Efficiency and show the quality of the filtrate produced by the present invention, during described technique, measure the turbidity of described filtrate for several times.
When arriving 40 millibars through the pressure drop of filter cake, described process operation terminates.
Although the present invention has combined specific embodiment and has been described, but it should not explained by any way
For being limited to the embodiment provided.The scope of the present invention is illustrated by appended claims.Background in described claim
Under, term " includes (comprising) " or " including (comprises) " is not excluded for other possible element or steps.Equally
Ground, the mentioning should not be construed as of labelling (references) such as " with (a) " or " with (an) " etc. does not includes plural number.Show about accompanying drawing
The use in the claims of the label of the element shown also should not be interpreted as limiting the scope of the present invention.Additionally, weigh in difference
During profit requires, mentioned single feature can be advantageously combined possibly, and it is special to mention these in different claims
Levy and be not excluded for the combination of these features and be impossible and be favourable.
Claims (25)
1. the method containing the liquid of various sizes of solid particle for bag filter, described method utilizes at least partly by institute
Stating the granuloplastic filter cake (18) comprised in the liquid comprising various sizes of solid particle, described solid particle is allowing liquid
Body flows through described filter cake (18) and deposits on the filter cake supporter (4) of the porous member of filtrate to provide, and described method includes:
-liquid comprising various sizes of solid particle is divided into lower part: the solid that a part comprises more than certain size
Granule and a part comprise less solid particle, and
-offer comprises the part of less solid particle with court from described in the liquid separation comprising various sizes of solid particle
To and by the direction of filter cake supporter (4) towards and through the flowing of described filter cake (18), thus comprise less described in providing
The filtration of the part of solid particle.
Method the most according to claim 1, wherein said filter cake (18) is passed through by the liquid comprising various sizes of solid particle
Granule deposition on filter cake supporter (4) is made.
Method the most according to claim 1, wherein said filter cake (18) is by the bag of the liquid comprising various sizes of solid particle
Part containing solid particle more than certain size is made by granule deposition on filter cake supporter (4).
Method the most according to claim 1, the liquid wherein comprising various sizes of solid particle is untreated waste water.
5., according to the method for any one of aforementioned claim, the liquid wherein comprising various sizes of solid particle is dirty for activity
Sludge mixed material liquid and include that the part of smaller particle is activated sludge floating layer, and wherein more than certain size solid particle
For active pollution index.
Method the most according to claim 5, wherein said activated sludge mixed liquor is to process technique from biological wastewater
Activated sludge mixed liquor.
Method the most according to claim 5, wherein said activated sludge floating layer is by sedimentation activated sludge mixed liquor.
Method the most according to claim 5, wherein said filter cake (18) is by the flco comprised in described activated sludge mixed liquor
With the material offer by adding the condensation that coagulant provides in described mud.
Method the most according to claim 1, the wherein said filter cake (18) backing layer on filter cake supporter is formed, the described back of the body
Layer has the aperture allowing filtrate by allowing filter cake accumulation simultaneously, and wherein said filter cake is removed together with described backing layer.
Method the most according to claim 1, farther includes the removal of filter cake (18), and described removal includes providing towards described
The flowing of the liquid by filter cake supporter (4) of filter cake (18).
11. methods according to claim 1, farther include by mechanism as scraping, chemical action, the flowing of bubble,
Heat effect, use ultrasonic Sonication or be intended to from any other method of above support separation filter cake to remove filter cake
Or its residue (18).
12. methods according to claim 10, farther include to return the filter cake (18) removed to comprise activated sludge mixing
The process tank (1) of feed liquid.
13. methods according to claim 11, farther include to return the filter cake (18) removed to comprise activated sludge mixing
The process tank (1) of feed liquid.
14. methods according to claim 1, farther include the foundation of filter cake (18), and described foundation includes providing:
Liquid to the flowing of described filter cake supporter (4), described liquid be the liquid comprising different size solid particle or
Comprise the part of the solid particle of more than certain size,
Through described filter cake supporter (4) and when time deposited thereon the pressure differential of flco, described to provide liquid to pass through
Filter cake supporter (4) and the flowing of flco deposited thereon；
Until filter cake (18) has been formed.
15. methods according to claim 14, wherein the foundation of filter cake (18) farther includes:
In order to prevent further filter cake from increasing, by the district comprised before the described partial flushing filter cake (18) of smaller particle
Territory thus remove filter cake (18) set up during use liquid.
16. methods according to claim 14, wherein during filter cake (18) is set up, through filter cake supporter (4) with when deposition
Under time on it, the pressure differential of described flco is 1 Palestine and Israel.
17. methods according to claim 15, wherein during filter cake (18) is set up, through filter cake supporter (4) with when deposition
Under time on it, the pressure differential of described flco is 1 Palestine and Israel.
18. methods according to claim 14, the described pressure differential wherein according to predefined attribute, during filter cake (18) foundation
The most constant, or the flowing by described filter cake and the liquid of filter cake supporter during filter cake (18) foundation is the most permanent
Determine, or flowing and pressure all change over.
19. methods according to claim 14, wherein reach when the solid masses of the per unit area of described filter cake supporter
When the level of preliminary election such as every square metre 0.05 is to dry solid between 10kg, it is defined as filter cake (18) and has been formed.
20. methods according to claim 14, wherein during filter cake (18) is set up, through filter cake supporter (4) with when deposition
Time on it, the pressure differential of described flco increases in time.
21. methods according to claim 20, wherein when described pressure differential has reached the level of preliminary election, are defined as filter cake (18)
Formed.
22. methods according to claim 1, farther include to measure and have passed through filter cake supporter (4) and the liquid of filter cake (18)
One or more parameters of body such as turbidity, suspended sediment concentration, total count of bacteria, organic carbon concentration, COD
(COD), described mensuration is by measuring and/or having calculated.
23. methods according to claim 1, further include at filter cake (18) and have been used for bag filter containing less solid particle
Capture described filter cake (18) or its granule after part and it is removed from such as Waste Water Treatment as superfluous activated sludge.
24. methods according to claim 1, wherein said filter method includes that following circulation repeats:
The foundation of filter cake (18),
Comprise the filtration of the part of less solid particle,
The removal of filter cake (18).
25. methods according to claim 1, wherein said method forms a part for method of wastewater treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610596651.0A CN106178636B (en) | 2011-04-05 | 2012-03-27 | Method and system for filtering and cake layer is formed |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201170160 | 2011-04-05 | ||
| DKPA201170160 | 2011-04-05 | ||
| PCT/DK2012/050093 WO2012136214A1 (en) | 2011-04-05 | 2012-03-27 | Method and system for filtration and filtration cake layer formation |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610596651.0A Division CN106178636B (en) | 2011-04-05 | 2012-03-27 | Method and system for filtering and cake layer is formed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103596657A CN103596657A (en) | 2014-02-19 |
| CN103596657B true CN103596657B (en) | 2016-11-30 |
Family
ID=
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| US3715191A (en) * | 1970-07-13 | 1973-02-06 | Whiting Corp | Apparatus for making wet process phosphoric acid |
| US4539097A (en) * | 1984-02-29 | 1985-09-03 | Standard Oil Company (Indiana) | Method for filtering solvent and tar sand mixtures |
| EP1270514A1 (en) * | 2000-03-27 | 2003-01-02 | Ebara Corporation | Method and apparatus for treating waste water |
| WO2003089103A2 (en) * | 2002-04-16 | 2003-10-30 | Conocophilips Company | Optimized solid/liquid separation system for multiphase converters |
| CN1625428A (en) * | 2002-01-31 | 2005-06-08 | 科斯洛技术公司 | Precoat filter media, and methods of making and using |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3715191A (en) * | 1970-07-13 | 1973-02-06 | Whiting Corp | Apparatus for making wet process phosphoric acid |
| US4539097A (en) * | 1984-02-29 | 1985-09-03 | Standard Oil Company (Indiana) | Method for filtering solvent and tar sand mixtures |
| EP1270514A1 (en) * | 2000-03-27 | 2003-01-02 | Ebara Corporation | Method and apparatus for treating waste water |
| CN1625428A (en) * | 2002-01-31 | 2005-06-08 | 科斯洛技术公司 | Precoat filter media, and methods of making and using |
| WO2003089103A2 (en) * | 2002-04-16 | 2003-10-30 | Conocophilips Company | Optimized solid/liquid separation system for multiphase converters |
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