CN102627384A - Sludge treatment method capable of improving marsh gas yield - Google Patents
Sludge treatment method capable of improving marsh gas yield Download PDFInfo
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- CN102627384A CN102627384A CN2012101215463A CN201210121546A CN102627384A CN 102627384 A CN102627384 A CN 102627384A CN 2012101215463 A CN2012101215463 A CN 2012101215463A CN 201210121546 A CN201210121546 A CN 201210121546A CN 102627384 A CN102627384 A CN 102627384A
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- sludge
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- marsh gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention provides a sludge treatment method capable of improving marsh gas yield. The sludge treatment method comprises the steps of firstly dewatering and pretreating sludge produced in the sewage treatment process to keep the water content of the sludge to be 87-93 percent; heating and pressurizing the dewatered and pretreated sludge, wherein the heating temperature is 160-190 DEG C, the pressure is 5-10 times of atmospheric pressure and the duration is 25-50 minutes; reducing to normal pressure and decreasing the temperature; and after the temperature of the sludge is decreased to 30-36 DEG C, conducting medium-temperature anaerobic digestion treatment to produce mash gas. By heating and pressurizing the sludge to crack cells in the sludge, liquid in the cells flows out, organic matters are released, the fluidity of the sludge is improved, the anaerobic digestion efficiency is improved, the rate of conversion from organic matters to the marsh gas is improved to more than 60 percent, the yield of the marsh gas is improved by more than one time, the energy recovery rate is improved, the produced energy can make up the energy consumed in the sewage treatment process and the economic benefit of the sewage treatment is increased.
Description
Technical field
The treatment process of the mud that the present invention relates to produce in a kind of sewage treatment process belongs to technical field of sludge treatment.
Background technology
Activated sludge process is to be the main method of the biological wastewater treatment of main body with the active sludge, bubbling air continuously in waste water, the sludge-like throw out that behind certain hour, forms because of the aerobic microbial reproduction.Perching on it with the zoogloea is main micropopulation, has the very strong absorption and the ability of oxidation of organic compounds.Existing activated sludge sewage processing system comprises coarse rack pond, fine fack pond, settling pit, biological reaction tank and settling tank; Settling tank is connected with biological reaction tank through return line; After the coarse rack of sewage in the coarse rack pond held back thick suspended substance, promote entering fine fack pond, behind fine fack, flow in the settling pit again through sump pump; Mixed solution in settling pit behind the deposition removal coarse sand gets into biological reaction tank and carries out a biological disposal upon, and gets into settling tank at last.Upper strata clear water in the heavy pond is discharged, and bottom mud major part is back to biological reaction tank again and forms active sludge intermixture, concentrates after redundance is then discharged to make its water ratio reach 97 ~ 98%, carries out Anaerobic Digestion then, produces biogas, realizes reusing of energy source.Mud after the anaerobic digestion is discharged processed again and is fallen.
The microorganism cells that carries out in the mud of anaerobic digestion contains large amount of organic; These organism are present in the mud with microorganism cells always; Be not fully utilized, cause the efficient of anaerobic digestion lower, the biogas amount of generation does not increase; Tradition anaerobic digestion process organic matter transformation is that the transformation efficiency of biogas is about 30%, and this problem is a great problem in the sludge handling process.
Chinese patent document CN102241464A discloses a kind of " municipal sludge treatment process and equipment thereof "; This method comprise the steps: to heat get into behind thickened sludge to 45 ~ 55 ℃ in the pyrohydrolysis acidification reactor at pH be 6.5 ~ 7.5, temperature is to carry out warm water under 40 ~ 55 ℃ of conditions to separate anaerobic digestion reaction 2 ~ 5 days, the acidication product; After the temperature of acidication product reduced to 35 ~ 40 ℃, to produce the methane digestion reactor be to carry out medium temperature hydrolyzation anaerobic digestion reaction 10 ~ 17 days under 35 ~ 38 ℃ of conditions in temperature to temperature in the entering, biogas and digested sludge; Biogas is carried out desulfurization to be handled; Digested sludge is dewatered, produce dewatered sludge and Digestive system.Though this method is to make microbial cell wall sporoderm-broken rate in the mud through the pyrohydrolysis acidifying; Organism in the cell is discharged, increase biogas output, but its process also is that present anaerobic sludge digestion technology is general; Not only process is complicated; Handle excessive cycle, microbial cell is fully broken, biogas output increases limited.
Summary of the invention
The present invention is directed to the problem that anaerobic digestion efficient is low, the biogas quantum of output is low of the technology existence of existing sludge treatment, a kind of method for sludge treatment that can improve anaerobic digestion efficient and biogas quantum of output is provided.
The method for sludge treatment of raising biogas output of the present invention is:
At first through the dehydration pre-treatment, making moisture percentage in sewage sludge is 87 ~ 93%, to the pretreated mud heating and pressurizing of dewatering with the mud that produces in the sewage treatment process; Heating temperature is 160 ~ 190 ℃, and moulding pressure is 5 ~ 10 normal atmosphere, continues 25 minutes ~ 50 minutes; Reduce to normal pressure then; And cooling, after being cooled to 30 ~ 36 ℃, mud gets into anaeration in normal temperature digestion process process, produce biogas.
The present invention makes in the mud microbial cell break through heating and pressurizing, and intracellular liquid flows out, fully releasing organics; Improved the flowability of mud self, made anaerobic digestion efficient improve, organic matter transformation is that the transformation efficiency of biogas is brought up to more than 60%; Biogas output is more than doubled; The energy recovery rate is improved, and the energy of generation can replenish the energy consumption in the sewage treatment process, has increased the economic benefit of WWT.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
Embodiment
Method for sludge treatment of the present invention, process is fairly simple, and its flow process is as shown in Figure 1.At first through the dehydration pre-treatment, make moisture percentage in sewage sludge reach 87 ~ 93% in the mud that produces in the sewage treatment process.To the pretreated mud heating and pressurizing of dewatering, Heating temperature is 160 ℃ ~ 190 ℃, and moulding pressure is 5 ~ 10 normal atmosphere, and the heating and pressurizing process continues 25 minutes ~ 50 minutes.The mud release of pressure is to normal pressure then, and carries out heat exchange through watercooler and make mud be cooled to 30 ~ 36 ℃, then gets into existing traditional anaeration in normal temperature Digestive tract (middle temperature is produced the methane digestion reactor) and carries out anaeration in normal temperature digestion, generation biogas.The anaerobic digestion of mud is meant that mud is under oxygen free condition; By amphimicrobe and anaerobic bacterium the biodegradable organism in the mud is resolved into carbonic acid gas, methane and water etc.; Making mud obtain stable process, is one of conventional means of sludge reduction, stabilization.Postdigestive mud carries out other treatment and disposal by the existing conventional method after dewatering.
Tradition anaerobic digestion process organic matter transformation is that the transformation efficiency of biogas is about 30%, and through behind the method for sludge treatment of the present invention, transformation efficiency is brought up to more than 60%, and biogas output is more than doubled.
Claims (1)
1. plant the method for sludge treatment that improves biogas output, it is characterized in that:
At first through the dehydration pre-treatment, making moisture percentage in sewage sludge is 87 ~ 93%, to the pretreated mud heating and pressurizing of dewatering with the mud that produces in the sewage treatment process; Heating temperature is 160 ~ 190 ℃, and moulding pressure is 5 ~ 10 normal atmosphere, continues 25 minutes ~ 50 minutes; Reduce to normal pressure then; And cooling, after being cooled to 30 ~ 36 ℃, mud gets into anaeration in normal temperature digestion process process, produce biogas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101215463A CN102627384A (en) | 2012-04-24 | 2012-04-24 | Sludge treatment method capable of improving marsh gas yield |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101215463A CN102627384A (en) | 2012-04-24 | 2012-04-24 | Sludge treatment method capable of improving marsh gas yield |
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| CN102627384A true CN102627384A (en) | 2012-08-08 |
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| CN2012101215463A Pending CN102627384A (en) | 2012-04-24 | 2012-04-24 | Sludge treatment method capable of improving marsh gas yield |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482110A (en) * | 2016-12-14 | 2017-03-08 | 北京神雾环境能源科技集团股份有限公司 | A kind of pyrolysis and the system and method for anaerobic digestion coupling processing rubbish |
| CN108218176A (en) * | 2017-12-07 | 2018-06-29 | 上海梵煦环境科技有限公司 | A kind of sludge carbonization all-in-one machine and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631821A (en) * | 2004-12-17 | 2005-06-29 | 清华大学 | Urban sludge treatment method |
| US20060000108A1 (en) * | 2004-03-02 | 2006-01-05 | Daewoo Engineering & Construction Co., Ltd. | Method and apparatus for treating sludge using micro-wave and hot air |
| CN101012095A (en) * | 2007-01-29 | 2007-08-08 | 清华大学 | Low consumption highly effective sludge drying method |
-
2012
- 2012-04-24 CN CN2012101215463A patent/CN102627384A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060000108A1 (en) * | 2004-03-02 | 2006-01-05 | Daewoo Engineering & Construction Co., Ltd. | Method and apparatus for treating sludge using micro-wave and hot air |
| CN1631821A (en) * | 2004-12-17 | 2005-06-29 | 清华大学 | Urban sludge treatment method |
| CN101012095A (en) * | 2007-01-29 | 2007-08-08 | 清华大学 | Low consumption highly effective sludge drying method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482110A (en) * | 2016-12-14 | 2017-03-08 | 北京神雾环境能源科技集团股份有限公司 | A kind of pyrolysis and the system and method for anaerobic digestion coupling processing rubbish |
| CN108218176A (en) * | 2017-12-07 | 2018-06-29 | 上海梵煦环境科技有限公司 | A kind of sludge carbonization all-in-one machine and method |
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Application publication date: 20120808 |