CN105174680A - Method for improving sludge pretreatment efficiency and dehydration effect through stepped hydrolysis - Google Patents
Method for improving sludge pretreatment efficiency and dehydration effect through stepped hydrolysis Download PDFInfo
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- CN105174680A CN105174680A CN201510613992.XA CN201510613992A CN105174680A CN 105174680 A CN105174680 A CN 105174680A CN 201510613992 A CN201510613992 A CN 201510613992A CN 105174680 A CN105174680 A CN 105174680A
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Abstract
The invention discloses a sludge pretreatment method. The sludge pretreatment method is characterized in that according to the bonding strength of carbon sources in sludge, hydrolysis intensity is improved step by step to treat the sludge in stages, after each stage is finished, the released carbon sources are recovered, and then treatment in the next stage is carried out.
Description
Technical field
The invention belongs to organic solid waste process and resource utilization field.More specifically, the present invention relates to a kind of method being released carbon raising sludge pretreatment efficiency and dehydrating effect by staged hydrolysis.
Background technology
Sludge treatment is one of China's the most urgent current environmental problem with disposing, and by the end of the end of the year 2010, nearly 2,200 ten thousand tons of Chinese dewatered sludge output, will at least reach 2,615 ten thousand tons at the end of predicting 2015.Anaerobic digestion is the important technology of sludge reduction, stabilization and resource utilization, but the provide protection of Extracellular polymers and cohesion and microorganism wall, make hydrolysis become the rate-limiting step of anaerobic sludge digestion.For promoting sludge hydrolytic, people have carried out large quantifier elimination to different pretreatment processs, comprise heating method, add chemical method (acid adding, add alkali), mechanical crushing method, cold method and biological hydrolysis process etc.
But there is following problem demanding prompt solution in the pretreatment process of traditional single intensity: (1) sludge hydrolytic process energy and material consumption excessive, the cell of sludge microbe is needed to crack, the just hydrolysis power of necessary additional some strength, as high temperature, highly basic etc.(2) hydrolysis method is too single, does not match with the complicacy of sludge components, energy and material wastage serious.Adopt the hydrolysis method of single intensity, the sludge carbon source causing bonding force large on the one hand can not discharge effectively; On the other hand, for the sludge carbon source that bonding force is weak, high strength is hydrolyzed, and wastes energy, and the carbon source even making part discharge is converted into not available material, again as melanoidin etc.(3) release the materials such as a large amount of protein in sludge hydrolytic process, sewage sludge viscosity is increased, more difficult dehydration, cause the carbon source rate of recovery lower.
For above problem, the present invention, according to the occurrence form of carbon source in mud, selects the pretreatment condition of respective strengths, impels the carbon source in mud progressively discharged in born of the same parents by born of the same parents and reclaim outward, reach energy-saving and cost-reducing, raising hydrolysis efficiency, and improve the object of pretreating sludge dehydration usefulness.
Summary of the invention
The object of the present invention is to provide a kind of method being released carbon raising sludge pretreatment efficiency and dehydrating effect by staged hydrolysis, according to the occurrence form of carbon source in mud, select the pretreatment condition of respective strengths, impel carbon source in mud by born of the same parents' release progressively and recovery in born of the same parents outward, to reach energy-saving and cost-reducing, improve pre-treatment efficiency and the object improving pretreating sludge dehydration usefulness.
To achieve these goals, technical scheme of the present invention is as follows: the I stage: select relatively mild pretreatment condition, impels the carbon source be free in mud to be discharged preferably.In the II stage: select slightly strong pretreatment condition, impel being combined more weak carbon source (as sponginess EPS) with microorganism cells and better being discharged.In the III stage: strengthen further hydrolysis intensity, impel being combined stronger carbon source (as compactness EPS) with microorganism cells and better being discharged.The IV stage: then strengthen hydrolysis intensity, impel the carbon source be present in born of the same parents to be discharged preferably.And each stage Mo first reclaims the carbon source that it discharges, then carbon is released in the hydrolysis carrying out next stage.
Compared with the pretreatment process of traditional single intensity, the present invention has the following advantages: (1), according to the existence form of sludge carbon source, selects pretreatment condition targetedly, has both avoided the waste of energy, impel again the carbon source in mud to discharge comparatively fully, improve pre-treatment efficiency.(2) by release stage by stage with reclaim carbon source, avoid the materials such as the protein that single intensity pre-treatment discharges to the deterioration of dewatering performance of sludge, enhance the dewatering of pretreating sludge, improve the rate of recovery of release carbon source.(3) by carrying out stepped recovery to discharged carbon source, avoiding the excessive hydrolysis discharging carbon source, decreasing the formation of difficult degradation by product, improve the overall quality of release carbon source.
More specifically, the invention provides the following:
1. sludge pre-treatment method, is characterized in that: according to carbon source bonding strength in mud, by progressively improving the process that hydrolysis intensity is carried out stage by stage to mud, and after each stage terminates, first reclaims the carbon source of release, then carries out next stage process.
2. the method for the 1st, described method comprises with the next stage:
In the I stage: select relatively mild condition lignin-sludge, the free carbon source in mud is impelled to be discharged; In the II stage: the condition lignin-sludge that the Selection radio I stage is stronger, impel the microorganism cells in mud to be combined more weak carbon source and discharged; In the III stage: the condition lignin-sludge that the Selection radio II stage is stronger, impel the microorganism cells in mud to be combined stronger carbon source and discharged; In the IV stage: the condition lignin-sludge that the Selection radio III stage is stronger, the carbon source in the microorganism cells in mud is impelled to be discharged,
Wherein after each stage terminates, mud-water separation is carried out to reclaim the carbon source discharged to the mud of process, then the residue of gained is used for next stage.
3. the method for the 2nd, the wherein said I stage is gentle thermal treatment, the described II stage is the thermal treatment higher than described I phase temperature, the described III stage pH of mud is adjusted to alkalescence while the temperature keeping the described II stage to carry out hot alkali treatment, and the described IV stage is the hot alkali treatment of carrying out in temperature higher compared with the described III stage and pH.
4. the method for the 3rd, the treatment condition of wherein said four-stage are: the I stage: 50 DEG C-70 DEG C, do not regulate sludge pH; The II stage: 70 DEG C-90 DEG C, do not regulate sludge pH; The III stage: 70 DEG C-90 DEG C, sludge pH is adjusted to 10-12; The IV stage: 80 DEG C-100 DEG C, sludge pH is adjusted to 11-13.
5. the method for the 3rd, the treatment condition of wherein said four-stage are: the I stage: 60 DEG C, do not regulate sludge pH; The II stage: 80 DEG C, do not regulate sludge pH; The III stage: 80 DEG C, sludge pH is adjusted to 11; The IV stage: 90 DEG C, sludge pH is adjusted to 12.
6. the method for the 2nd, wherein before treatment, the concentration of mud is adjusted to 20-70gTS/L by with water.
7. the method for the 2nd, wherein after each stage terminates, by the mud after this stage processing under 7000r centrifugal 10 minutes to carry out mud-water separation, carry out next stage after the residue water of gained is recalled to original content.
8. the 4th or the method for 5, the treatment time in wherein said I stage and II stage is 2-5 hour, and the treatment time in described III stage and IV stage is 5-8 hour.
9. the 1st or the method for 2, to be wherein take from the second pond of municipal wastewater treatment plant or the mud of settling tank by the mud of described method process.
Accompanying drawing explanation
Fig. 1 is the releasing rule that ladder releases SCOD in carbon process.
Fig. 2 is the release conditions figure of traditional single intensity pretreating sludge SCOD.
Fig. 3 is the changing conditions that ladder releases CST in carbon process.
Fig. 4 is the changing conditions of the CST of traditional single intensity pretreating sludge.
Embodiment
The present invention is further described below in conjunction with accompanying drawing and example, but not by the restriction of drawings and Examples.
The excess sludge being applicable to the inventive method takes from second pond or the settling tank of municipal wastewater treatment plant, and in mud, essential substance is the organism such as protein, polysaccharide and organic acid, accounts for more than 50% of mud total mass.
Embodiment 1
With after municipal sewage plant's second pond through the mud of overdraft for object, its water ratio is about 85%, with distilled water, its concentration is transferred to 30gTS/L.Experimental program is: the I stage: 60 DEG C, the lignin-sludge 3h when not regulating sludge pH; The II stage: 80 DEG C, the lignin-sludge 3h when not regulating sludge pH; The III stage: 80 DEG C, by the pH regulator to 11 of mud, process 6h; The IV stage: 90 DEG C, by the pH regulator to 12 of mud, process 6h.Mud eppendorf5804R whizzer after process is all carried out mud-water separation in centrifugal 10 minutes under 7000r by per stage Mo, is called by residue after distilled water recalls to original content and carries out next stage.By 90 DEG C, under pH=12 condition pre-treatment 3h mud in contrast.Fig. 1 and Fig. 2 is respectively the SCOD that the present invention and the single intensity pre-treatment of tradition discharge.As can be seen from Figure 1, the release of SCOD presents steps rule, and compares the pre-treatment with traditional single intensity, and final the discharged SCOD of present method adds about 25%.
Embodiment 2
With after municipal sewage plant's second pond through the mud of overdraft for object, its water ratio is about 85%, with distilled water, its concentration is transferred to 30gTS/L.Experimental program is: the I stage: 60 DEG C, the lignin-sludge 3h when not regulating sludge pH; The II stage: 80 DEG C, the lignin-sludge 3h when not regulating sludge pH; The III stage: 80 DEG C, by the pH regulator to 11 of mud, process 6h; The IV stage: 90 DEG C, by the pH regulator to 12 of mud, process 6h.Mud eppendorf5804R whizzer after process is all carried out mud-water separation in centrifugal 10 minutes under 7000r by per stage Mo, carries out next stage after residue distilled water being recalled to original content.By 90 DEG C, under pH=12 condition pre-treatment 3h mud in contrast.Fig. 3 and Fig. 4 is the changing conditions of the CST of the single intensity pretreating sludge of present method and tradition respectively, and as can be seen from the figure, what the CST value of present method terminal stage was more traditional have dropped about 1/2.Thus present method can the dewatering of improvement pretreating sludge to a certain degree.
Claims (9)
1. sludge pre-treatment method, is characterized in that: according to carbon source bonding strength in mud, by progressively improving the process that hydrolysis intensity is carried out stage by stage to mud, and after each stage terminates, first reclaims the carbon source of release, then carries out next stage process.
2. the method for claim 1, described method comprises with the next stage:
In the I stage: select relatively mild condition lignin-sludge, the free carbon source in mud is impelled to be discharged; In the II stage: the condition lignin-sludge that the Selection radio I stage is stronger, impel the microorganism cells in mud to be combined more weak carbon source and discharged; In the III stage: the condition lignin-sludge that the Selection radio II stage is stronger, impel the microorganism cells in mud to be combined stronger carbon source and discharged; In the IV stage: the condition lignin-sludge that the Selection radio III stage is stronger, the carbon source in the microorganism cells in mud is impelled to be discharged,
Wherein after each stage terminates, mud-water separation is carried out to reclaim the carbon source discharged to the mud of process, then the residue of gained is used for next stage.
3. the method for claim 2, the wherein said I stage is gentle thermal treatment, the described II stage is the thermal treatment higher than described I phase temperature, the described III stage pH of mud is adjusted to alkalescence while the temperature keeping the described II stage to carry out hot alkali treatment, and the described IV stage is the hot alkali treatment of carrying out in temperature higher compared with the described III stage and pH.
4. the method for claim 3, the treatment condition of wherein said four-stage are: the I stage: 50 DEG C-70 DEG C, do not regulate sludge pH; The II stage: 70 DEG C-90 DEG C, do not regulate sludge pH; The III stage: 70 DEG C-90 DEG C, sludge pH is adjusted to 10-12; The IV stage: 80 DEG C-100 DEG C, sludge pH is adjusted to 11-13.
5. the method for claim 3, the treatment condition of wherein said four-stage are: the I stage: 60 DEG C, do not regulate sludge pH; The II stage: 80 DEG C, do not regulate sludge pH; The III stage: 80 DEG C, sludge pH is adjusted to 11; The IV stage: 90 DEG C, sludge pH is adjusted to 12.
6. the method for claim 2, wherein before treatment, the concentration of mud is adjusted to 20-70gTS/L by with water.
7. the method for claim 2, wherein after each stage terminates, by the mud after this stage processing under 7000r centrifugal 10 minutes to carry out mud-water separation, carry out next stage after the residue water of gained is recalled to original content.
8. the method for claim 4 or 5, the treatment time in wherein said I stage and II stage is 2-5 hour, and the treatment time in described III stage and IV stage is 5-8 hour.
9. the method for claim 1 or 2 will be wherein take from the second pond of municipal wastewater treatment plant or the mud of settling tank by the mud of described method process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873877A (en) * | 2022-04-10 | 2022-08-09 | 同济大学 | Method for representing organic matter bonding strength in sludge extracellular polymer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873877A (en) * | 2022-04-10 | 2022-08-09 | 同济大学 | Method for representing organic matter bonding strength in sludge extracellular polymer |
| CN114873877B (en) * | 2022-04-10 | 2023-07-04 | 同济大学 | Method for representing organic matter bonding strength in sludge extracellular polymer |
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