CN100591633C - Sludge concentration bridging dehydration method - Google Patents
Sludge concentration bridging dehydration method Download PDFInfo
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- CN100591633C CN100591633C CN200810059917A CN200810059917A CN100591633C CN 100591633 C CN100591633 C CN 100591633C CN 200810059917 A CN200810059917 A CN 200810059917A CN 200810059917 A CN200810059917 A CN 200810059917A CN 100591633 C CN100591633 C CN 100591633C
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- sludge
- mud
- bed course
- particle bed
- dehydration method
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Abstract
The present invention discloses a sludge bridging dewatering method which is suitable for filtering and dewatering the active sludge with larger viscosity. The sludge bridging dewatering method arranges a trolley layer between the filtering medium and the sludge of the tension compression or opposite-pressure compression of the belt filter press, the trolley layer is a particle cushion layer facilitating the compressing discharging of the moisture in the sludge, and the particles of the particle cushion layer is coated on the filtering medium through a distributing device on the upper side ofthe filtering medium at the feeding side of the belt filter press. The trolley layer formed by the particle cushion layer arranged between the filtering medium and the sludge leads to that the sludgedoes not contact the filtering medium directly and settles the problem that the filtering medium is blocked and the filtering dewatering effect is affected in the sludge filtering dewatering process of the prior art, facilitates that not only the moisture in the active viscous sludge is discharged through the trolley layer smoothly but also the filter cake is easily separated from the filtering medium in the discharging of the filter press.
Description
Technical field
The present invention relates to a kind of mud dewatering method, particularly a kind of sludge concentration bridging dehydration method that is applicable to the active sludge that the filter dehydration viscosity ratio is bigger.
Background technology
The active sludge viscosity ratio is bigger, easy blocking filtering medium and influence the filter dehydration effect in filter dehydration process.The measure that prior art is taked is a cleaning and regeneration of strengthening filtration medium, but problem is, stop up and often to occur in before filter dehydration also do not finish, and be to carry out filtration medium regeneration synchronously in dehydration, so can not fundamentally solve the plugged filtration media problem, can not effectively improve the filter dehydration effect.
Chinese patent application 90107715.1 " printing and dyeing wait the mud dewatering method after the sewage disposal " discloses the activated sludge dehydration method that granularity is less, viscosity ratio is bigger that industries such as a kind of printing and dyeing, papermaking produce.After this dewatering adopts slush pump that sludge slurry is squeezed into agitator, 5～20% wrap up in and take agent that in agitator, adds sludge slurry weight---coal dust or flyash, and after stirring 10 minutes with 60～70 rev/mins of rotating speeds, deliver to plate-and-frame filter press or vacuum filter and carry out filter dehydration.This dewatering required equipment is simple, volume is little, cost is low, can save investment 70% than indoor mummification method.Yet this dewatering uses wraps up in and takes agent and surrounded by active sludge as the core of mud flocculation group, and the outside surface of mud flocculation group remains heavy-gravity, and still easy blocking filtering medium influences the filter dehydration effect.
Chinese patent application 200410072729.6 " method of dry-treating municipal sludge by biological dehydrating machinery " discloses the treatment process of a kind of municipal wastewater treatment plant mud.This dewatering with the dewatered sludge of Sewage Plant water ratio 78% be that granule sludge below 10% is mixed to water ratio 50%～55% through mechanical mummification water ratio, input is added with in the biologically dehydrating pond of biologically dehydrating bacterial classification, through biochemical temperature reaction in 8～10 days, water ratio was reduced to below 35%; The biologically dehydrating municipal sludge enters mechanical anhydration system, and to carry out mummification to water ratio be below 10%, and a finished particle part is returned with the mud that wets and mixed, and rest part is municipal sludge and disposes final product.This biologically dehydrating adds mechanical mummification processed activated sludge process and has reduced working cost significantly, yet there is following defective in this dehydration treatment method: 1, the production cycle long, each batch needs 8～10 days are unfavorable for large-scale industrial production.2, biochemical intensification will consume a large amount of combustiblesubstance in the mud, thereby reduce the calorific value of dewatered sludge.3, the wet mud of establishing water ratio 78% is that the dried mud of X, water ratio 10% is Y, to mix the back water ratio be 50%, (78%X+10Y)/(X+Y)=50% then, get X: Y=1: 1.43, the ratio that the dried mud of this dewatering finished product mixes back in the wet mud is higher, the internal recycling amount is big, causes the actual treatment ability of equipment to reduce greatly.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the defective that prior art exists, and provides a kind of and can effectively solve the sludge concentration bridging dehydration method that makes plugged filtration media in the active sludge filter dehydration process, influences the filter dehydration effect problem.
The present invention addresses the above problem the technical scheme that is adopted: sludge concentration bridging dehydration method, be characterized in: this dewatering is the concentration bridging dehydration method that Stilt layer is set between the squeezing of belt filter press tension force or filtration medium that pressure is squeezed and mud, described Stilt layer is to make things convenient for the particle bed course that the moisture press filtration is deviate from the mud, the particle of described particle bed course by the distributor place mat of device above belt filter press feed end filtration medium on filtration medium.The Stilt layer that the particle bed course that is provided with between filtration medium and mud forms, mud is not directly contacted with filtration medium, fundamentally solved blocking filtering medium problem in the active sludge filter dehydration process, both allowed the interior moisture of active sticking shape mud deviate from by Stilt layer smoothly, during the pressure filter discharging, filter cake is easy to again separate with filtration medium.
The particle diameter of the described particle bed course of sludge concentration bridging dehydration method of the present invention is less than the pore diameter of filtration medium, and the particulate filtration resistivity is less than the specific drainage pressure of mud.
The particle place mat consumption of the described particle bed course of sludge concentration bridging dehydration method of the present invention requires to be controlled at 5～15% of wet mud weight according to mud kind and final mass dryness fraction.
The thickness both sides of the described particle bed course of sludge concentration bridging dehydration method of the present invention are thick, the middle part thin.Both reduced the place mat consumption of particulate material, and can avoid mud to be extruded again from both sides.
The described particle bed course of sludge concentration bridging dehydration method of the present invention is horizontally arranged with rib shape raised item.Retreating when having avoided sticking shape mud to enter nip drum increases inlet amount.
The present invention compared with prior art has the following advantages: this invention sludge concentration bridging dehydration method has overcome the defective that prior art exists in handling active sticking shape mud, can make belt filter press effectively handle active sticking shape mud, such as municipal sludge, leather mud etc., because the existence of particle bed course, blocking filtering medium when having avoided sticking shape mud by press filtration, make dewatering speed increase substantially, guarantee the filter-press dehydration effect.Test shows, the belt filter press that door is 1.5 meters adopts sludge concentration bridging dehydration method of the present invention, handling the wet mud of municipal administration day can reach more than 50 tons, the outlet mass dryness fraction is more than 50%, can directly act as a fuel, the multiduty utilization of fertilizer, soil conditioner or the like, or carry out landfill, burn or the like disposal by all kinds of means according to the mud shale.
Description of drawings
Fig. 1 is a sludge concentration bridging dehydration method embodiment principle of work synoptic diagram of the present invention.
Fig. 2 is an embodiment of the invention particle bed course synoptic diagram 1.
Fig. 3 is an embodiment of the invention particle bed course synoptic diagram 2.
The distributor structural representation that Fig. 4 adopts for sludge concentration bridging dehydration method embodiment of the present invention.
Fig. 5 is Fig. 4 distributor part sectioned view.
Fig. 6 is the local enlarged diagram of the sieve plate of Fig. 4 distributor.
Embodiment
Below by embodiment, in conjunction with the accompanying drawings the present invention is further described.
The embodiment sludge concentration bridging dehydration method is the concentration bridging dehydration method that Stilt layer is set between the squeezing of belt filter press tension force or filtration medium that pressure is squeezed and mud.Stilt layer is to make things convenient for the particle bed course that the moisture press filtration is deviate from the mud, the particle of this particle bed course by the distributor place mat of device above belt filter press feed end filtration medium on filtration medium.Under the very big situation of mud viscosity, during such as the processing domestic sludge, upper and lower filtration medium is all spread the particle bed course with on the mud contact surface, allows and all makes somebody a mere figurehead between upper and lower filtration medium and the mud; When handling paper-making deinking active sludge or printing and dyeing sludge, use the method for single berth particle bed course.Embodiment sludge concentration bridging dehydration method principle of work is referring to Fig. 1, the filtration medium of embodiment is a filter screen, particle bed course 5 place mats are on lower filter screen 3, during work, mud 6 wraps the tension force squeezing that is subjected to pressure roller 1 between upper filter screen 2 and particle bed course 5, lower filter screen 3 or to pressing squeezing, the filtrate 4 in the mud 6 leaches by particle bed course 5, lower filter screen 3.When Stilt layer---particle bed course 5 makes belt filter press carry out press dewatering, mud is not with filtration medium---lower filter screen 3 directly contacts, moisture in the active sticking shape mud 6 can be deviate from by particle bed course 5 smoothly, filter cake is easy to again separate with lower filter screen 3 during discharging, and concentration bridging dehydration method has fundamentally solved the disadvantage of active sludge blocking filtering medium.
The particulate material requirement of embodiment particle bed course, particle diameter are less than the pore diameter of filtration medium, and specific drainage pressure is less than the specific drainage pressure of mud.The particulate matter of particle bed course specifically can be selected ashes, coal powder, coal ash for use, perhaps the particulate matter that requires of other particulate material that meets the particle bed course.Particle place mat consumption requires to decide according to mud kind and final mass dryness fraction, is controlled at 5～15% of wet mud weight.Such as, deinked sludge requires final water ratio 45%, and then particle place mat consumption is 5% of wet mud weight; The final mass dryness fraction of municipal sludge requires to reach 50%, and then the particle consumption is 10% of wet mud weight; The final water ratio 50% of leather-making mud, then the particle consumption is controlled at 15% of wet mud weight; Generally, particle bed course particle consumption is controlled at water ratio about 80% wet more than 5% of mud weight.If the particle consumption is 5% of wet mud weight, wet moisture percentage in sewage sludge is 80%, solid content is 20%, and then over dry solid substance part by weight is 5: 20 in particulate matter consumption and the mud, promptly 1: 4; Embodiment particulate matter consumption is controlled at 5～15% of wet mud weight, then particulate matter consumption: in the mud over dry solid substance weight equal 1: 4～1.33.
The particle of embodiment particle bed course 5 is selected ashes for use, and distributor 7 place mats by being installed in belt filter press feed end lower filter screen 3 tops are on lower filter screen 3.Distributor 7 structures that embodiment adopts are referring to Fig. 4～6, during cloth, ashes enter from the opening for feed 71 of distributor 7, through fan-shaped decollator 75 the little lump in the ashes are broken up, prevent that ashes from luming in distributor 7, the ashes through breaing up fall from the sieve plate 73 of distributor 7 lower ends.The supporting filter screen of the width of sieve plate 73 and belt filter press is wide or slightly narrow, and the sieve aperture of control ashes flow is arranged on the sieve plate 73, the flow size and the place mat distribution situation on filter screen of the density of sieve aperture and unit perforated area decision ashes.Referring to Fig. 6, the unit perforated area is big on the big and limit, the aperture of the limit sieve aperture 731 on sieve plate 73 both sides, and intermediary sieve aperture 732 apertures are little and intermediate unit's perforated area is little.Among Fig. 4, Fig. 5 72 is that distributor outer wall, 74 is the distributor inwall.Sieve plate 73 adopt the both sides perforated areas big in the middle of the little method of perforated areas, 52 thin in the middle of making the place mat of ashes on filter cloth distribute to be, both sides 51 are thick, the thickness of embodiment particle bed course 5 is as shown in Figure 2.The place mat method that 51 thick, middle 52 positions, particle bed course both sides are thin has certain preventing to act on to the filter screen phenomenon of expecting that easily goes back and forth between two places, and has reduced the consumption of place mat particulate material again.Retreating when sticking shape mud enters nip drum, as shown in Figure 3, embodiment can also be on particle bed course 5 arranged transversely rib shape raised item 53.The setting of rib shape raised item 53 also is to realize by distributing mode and the program of controlling distributor 7.
Cloth of the present invention can also be selected the distributor of other type for use, such as, disclosed distributor also can be suitable in the Chinese patent 97205595.9 " distributor ".
" bridging " of the present invention refers to built on stilts filtration medium and mud when press dewatering, is the industry nomenclature.
The material to be drained off that " mud " of the present invention general reference industry filter-press dehydration is sayed can be industrial sludge, public works mud and plant's mud or the like such as paper industry, dyeing, leather industry, chemical industry, food service industry.
Claims (4)
1, a kind of sludge concentration bridging dehydration method, it is characterized in that: this dewatering is the concentration bridging dehydration method that Stilt layer is set between the squeezing of belt filter press tension force or filtration medium that pressure is squeezed and mud, described Stilt layer is to make things convenient for the particle bed course that the moisture press filtration is deviate from the mud, the particle of described particle bed course by the distributor place mat of device above belt filter press feed end filtration medium on filtration medium, the particle diameter of described particle bed course is less than the pore diameter of filtration medium, and the particulate filtration resistivity is less than the specific drainage pressure of mud.
2, sludge concentration bridging dehydration method according to claim 1 is characterized in that: the particle place mat consumption of described particle bed course requires to be controlled at 5～15% of wet mud weight according to mud kind and final mass dryness fraction.
3, sludge concentration bridging dehydration method according to claim 2 is characterized in that: the thickness both sides of described particle bed course are thick, the middle part thin.
4, sludge concentration bridging dehydration method according to claim 3 is characterized in that: described particle bed course is horizontally arranged with rib shape raised item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810059917A CN100591633C (en) | 2008-03-04 | 2008-03-04 | Sludge concentration bridging dehydration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810059917A CN100591633C (en) | 2008-03-04 | 2008-03-04 | Sludge concentration bridging dehydration method |
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| CN101239772A CN101239772A (en) | 2008-08-13 |
| CN100591633C true CN100591633C (en) | 2010-02-24 |
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| CN200810059917A Expired - Fee Related CN100591633C (en) | 2008-03-04 | 2008-03-04 | Sludge concentration bridging dehydration method |
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| CN104445863A (en) * | 2014-12-31 | 2015-03-25 | 梁毅 | Method for achieving deep sludge dehydration and energy utilization on plate-and-frame filter press |
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Address after: 314500 Zhenhua Road, second industrial zone, Tongxiang Economic Development Zone, Zhejiang, Tongxiang 1068, China Patentee after: Zhejiang Huazhang Technology Co., Ltd. Address before: 314500 Zhenhua Road, second industrial zone, Tongxiang Economic Development Zone, Zhejiang, Tongxiang 1068, China Patentee before: Huazhang Electric (Tongxiang) Co., Ltd. |
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