CN102515466A - Continuous thermal hydrolysis pretreatment process capable of reinforcing high temperature anaerobic fermentation of residual sludge - Google Patents
Continuous thermal hydrolysis pretreatment process capable of reinforcing high temperature anaerobic fermentation of residual sludge Download PDFInfo
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- CN102515466A CN102515466A CN2011104097021A CN201110409702A CN102515466A CN 102515466 A CN102515466 A CN 102515466A CN 2011104097021 A CN2011104097021 A CN 2011104097021A CN 201110409702 A CN201110409702 A CN 201110409702A CN 102515466 A CN102515466 A CN 102515466A
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- temperature anaerobic
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- 239000010802 sludge Substances 0.000 title claims abstract description 42
- 238000009283 thermal hydrolysis Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000855 fermentation Methods 0.000 title claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 title abstract 2
- 230000029087 digestion Effects 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims description 15
- 238000006460 hydrolysis reaction Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000007062 hydrolysis Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 238000005728 strengthening Methods 0.000 claims description 7
- 238000002513 implantation Methods 0.000 claims description 5
- 239000010801 sewage sludge Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 4
- 238000007669 thermal treatment Methods 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000009996 mechanical pre-treatment Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 210000001082 somatic cell Anatomy 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009997 thermal pre-treatment Methods 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
The invention discloses a continuous thermal hydrolysis pretreatment process capable of reinforcing the high temperature anaerobic fermentation of residual sludge. The method of the invention is characterized in that secondary steam is used for preheating a raw material, the heat steam with pressure of 0.9-1.1MP and the temperature of 182-186 DEG C is used for thermal hydrolysis pretreatment, and the treated material is placed in a traditional high temperature anaerobic fermentation system for treatment. Compared with the traditional high temperature anaerobic digestion system, the system processing capability of the process of the invention is enhanced by 2-3 times, the gas production of methane can reach 85%, and the high efficiency reuse of the heat steam can realize high quantitative reduction degree of the sludge and circular utilization with high efficiency of the energy.
Description
Technical field
The present invention relates to the solid waste disposal technical field, relate in particular to a kind of Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation.
Background technology
In recent years, along with the continuous reinforcement of China's rapid economy development and national environmental pollution management, drive the raising gradually of wastewater treatment in China efficient, meanwhile, sewage treatment process produces a large amount of excess sludges to be had pending.
The excess sludge treating method mainly contains aerobic sigestion technology and anaerobic digestion process, and wherein, there are shortcomings such as energy consumption is big, efficient is low in aerobic sigestion; And the large amount of organic matter in the mud can reduce sludge volume through the anaerobic digestion effect, destroys pathogenic micro-organism; Improve mud stability and improve biogas output simultaneously; Reclaim biomass energy, therefore, the research about sludge treatment at present mainly concentrates in the anaerobic digestion.The rate-limiting step of anaerobic sludge digestion is a sludge hydrolytic, and this structure and composition characteristics with mud is relevant.Most of organic substance is wrapped in the cell in the mud, and cell walls is high to the enzymolysis tolerance, and active somatic cell is difficult to participate in hydrolysis reaction under the protection of cell walls, limited anaerobic digestion speed.On the other hand, organic macromolecule such as protein, volume influence the fermentation substrate mass transfer process much larger than the cell fenestra, have hindered hydrolysis reaction and have carried out.Therefore, the traditional sludge anaerobic digestion process also exists the residence time long (20～30 days), digestion rate to wait problem slowly, need carry out certain pre-treatment, destroys cellularstructure, decomposes organic macromolecule, improves the anaerobic digestion performance of mud.
Pretreatment process comprises mechanical pretreatment, ultrasonic degradation, thermal treatment and chemical treatment etc., and wherein, thermal treatment can realize higher cell crashing ratio at the lesser temps and the residence time, and the organism dissolution rate is high, therefore obtains broad research.
As far back as 1970; Existing report is pointed out the pretreatment process of thermal treatment as the residual active sludge anaerobic digestion; The sludge treatment TR is at 150～200 ℃; The thermal treatment of lesser temps also has report, and Hiraoka in 1989 etc. heat-treat mud under 60～100 ℃, and 60 ℃ reach maximum gas production rate.Li YY in 1992 etc. heat-treat mud under 62～175 ℃, handle 60min for 170 ℃, and methane production has increased by 100%, and the volatile solid clearance improves 30%.Tanaka S in 1997 etc. heat-treat anaerobically digested sludge under 180 ℃, and methane production improves 90%, and the volatile solid clearance improves 30%.Climent M in 2007 etc. 70 ℃ to pyrolyzing sludge 9h, biogas output improves 50%.Along with further developing of mud thermal hydrolysis technology; More existing industrialization instances have been developed based on the pretreated Cambi technology of thermal hydrolysis like a tame Norway company, and system carries out thermal hydrolysis at 180 ℃ to mud; 30min solid solubilising is about 30%, produces the corresponding increase by 150% of biogas amount.In addition, Veolia company also sold the pyrolyzing sludge method of BioThelys by name.Mud is handled the back centrifuge dehydration through " thermal hydrolysis-anaerobic digestion ", obtains solids content and be 40%～50% mud cake, has significantly reduced sludge volume.But " thermal hydrolysis-anaerobic digestion " handled the heat-processed of residual active sludge and consumed great amount of heat energy; There are a large amount of waste heats in hydrolysis mud later; Cause calorific loss, and how a kind of technology of appropriate design can be utilized or the high efficiente callback that realizes heat energy is the important topic of research at present again to waste heat.
Summary of the invention
The purpose of this invention is to provide a kind of Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation; With the raising processing efficiency, and, hot steam is carried out efficient reuse through heat reclaiming system; Further energy efficient reduces and produces and running cost.
The present invention solves the problems of the technologies described above with following technical scheme:
The present invention can strengthen the Continuous Heat hydrolysis pretreatment technology of excess sludge high-temperature anaerobic fermentation, specifically may further comprise the steps:
(1) initial excess sludge is delivered to preheating can, is used to mud preheated processing from the secondary steam of whirlwind separator;
(2) mud after the preheating is sent in the thermal hydrolysis pipe continuously and quantitatively, and be that 80 ± 2 ℃ hot water is adjusted to 80-85% with moisture percentage in sewage sludge through implantation temperature;
(3) adopting multiple spot to feed pressure to the mud in the thermal hydrolysis pipe is that 1.0 ± 0.1MP, temperature are that 184 ± 2 ℃ steam carries out thermal hydrolysis and handled 10-60 minute;
(4) utilize the thermal hydrolysis pipe pressure, the mud after the interior steam of thermal hydrolysis pipe is handled with above-mentioned thermal hydrolysis is together spurted in the cyclonic separator through dumper;
(5) will the mud after cyclonic separator is handled deliver in the conventional high-temperature anaerobically fermenting treatment system and carry out digestion process, the secondary steam of collecting through cyclonic separator then is back to preheating can, is used for initial excess sludge is preheated processing.
In said (1) step, the water ratio of initial excess sludge is 75-83%, and the mud heated temperatures is 80-90 ℃.
In said (2) step, the mud after the preheating is to adopt the duplex gauger to be pumped in the T shape pipe by spiral pump continuously and quantitatively, gets in the lump in the thermal hydrolysis pipe with the hot water that injects again.
In said (4) step, the dumper of employing is the dumper that is provided with the perforated plate blow-off valve.
In said (5) step, the mud solid content after cyclonic separator is handled is 10-13%.
The present invention is directed to the constructional feature of mud self and the deficiency of traditional anaerobic digestion techniques, under high-temperature and high-pressure conditions,, discharge organic substance wherein the mud destruction that is hydrolyzed; And can decompose the organic macromolecule material is organic molecule; Effectively improve the anaerobism biodegradability of mud, fundamentally improve the efficient of anaerobic sludge digestion, shorten aerogenesis peak and sludge retention time; Thereby shorten the cycle of operation, reduce running cost.The relative conventional high-temperature anaerobic digester system of the present invention, system processing power has improved 2～3 times, and the methane gas production rate reaches 85%.In addition, the present invention carries out thermal pretreatment through recycling secondary steam to excess sludge, when improving sludge high temperature anaerobic digestion efficient; Realized the efficient reuse of hot steam; Further save energy has good environment and economic benefit, gets final product effective system energy consumption; Realize that the sludge reduction degree is high, the high efficiency of energy recycle.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
Embodiment 1
Municipal sewage plant's water ratio is after 75% excess sludge is delivered to preheating can, to be used to from the secondary steam of whirlwind separator it preheated processing, and the mud temperature after heating is 85 ℃; The mud of preheating pumps into T shape pipe by spiral pump continuously and quantitatively through the duplex gauger, with T shape pipe top implantation temperature be that 80 ℃ hot water gets in the thermal hydrolysis pipe in the lump, moisture percentage in sewage sludge is adjusted to 80%.To the mud in the thermal hydrolysis pipe; The multiple spot injection pressure is 1.0MP; Temperature is that 184 ℃ steam carries out thermal hydrolysis and handles after 60 minutes, spurts in the cyclonic separator through the dumper of perforated plate blow-off valve, and be that 11% mud is delivered to high-temperature anaerobic fermentation system and carried out digestion process with solid content in the cyclonic separator; Isolated secondary steam then is back to preheating can, is used for preheating of excess sludge.
Embodiment 2
Municipal sewage plant's water ratio is after 80% excess sludge is delivered to preheating can, to be used to from the secondary steam of whirlwind separator it preheated processing, and the mud temperature after heating is 90 ℃; The mud of preheating pumps into T shape pipe by spiral pump continuously and quantitatively through the duplex gauger, with T shape pipe top by a certain percentage implantation temperature be that 82 ℃ hot water gets in the thermal hydrolysis pipe in the lump, moisture percentage in sewage sludge is adjusted to 83%.To the mud in the thermal hydrolysis pipe; The multiple spot injection pressure is 1.1MP; Temperature is that 186 ℃ steam carries out thermal hydrolysis and handles after 30 minutes, spurts in the cyclonic separator through the dumper of perforated plate blow-off valve, and be that 10% mud is delivered to high-temperature anaerobic fermentation system and carried out digestion process with solid content in the cyclonic separator; Isolated secondary steam then is back to preheating can, is used for preheating of excess sludge.
Embodiment 3
Municipal sewage plant's water ratio is after 83% excess sludge is delivered to preheating can, to be used to from the secondary steam of whirlwind separator it preheated processing, and the mud temperature after heating is 80 ℃; The mud of preheating pumps into T shape pipe by spiral pump continuously and quantitatively through the duplex gauger, with T shape pipe top by a certain percentage implantation temperature be that 78 ℃ hot water gets in the thermal hydrolysis pipe in the lump, moisture percentage in sewage sludge is adjusted to 85%.To the mud in the thermal hydrolysis pipe; The multiple spot injection pressure is 0.9MP; Temperature is that 182 ℃ steam carries out thermal hydrolysis and handles after 10 minutes, spurts in the cyclonic separator through the dumper of perforated plate blow-off valve, and be that 13% mud is delivered to high-temperature anaerobic fermentation system and carried out digestion process with solid content in the cyclonic separator; Isolated secondary steam then is back to preheating can, is used for preheating of excess sludge.
Claims (5)
1. the Continuous Heat hydrolysis pretreatment technology that can strengthen the excess sludge high-temperature anaerobic fermentation is characterized in that this treatment process may further comprise the steps:
(1) initial excess sludge is delivered to preheating can, is used to mud preheated processing from the secondary steam of whirlwind separator;
(2) mud after the preheating is sent in the thermal hydrolysis pipe continuously and quantitatively, and be 80 ± 2 ℃ hot water, moisture percentage in sewage sludge is adjusted to 80-85% through implantation temperature;
(3) adopting multiple spot to feed pressure to the mud in the thermal hydrolysis pipe is that 1.0 ± 0.1MP, temperature are that 184 ± 2 ℃ steam carries out thermal hydrolysis and handled 10-60 minute;
(4) utilize the thermal hydrolysis pipe pressure, the mud after the interior steam of thermal hydrolysis pipe is handled with above-mentioned thermal hydrolysis is together spurted in the cyclonic separator through dumper;
(5) will the mud after cyclonic separator is handled deliver in the conventional high-temperature anaerobically fermenting treatment system and carry out digestion process, the secondary steam of collecting through cyclonic separator then is back to preheating can, is used for initial excess sludge is preheated processing.
2. the Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation according to claim 1 is characterized in that, in said (1) step, the water ratio of initial excess sludge is 75-83%, and the mud heated temperatures is 80-90 ℃.
3. the Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation according to claim 1; It is characterized in that; In said (2) step; Mud after the preheating is to adopt the duplex gauger to be pumped in the T shape pipe by spiral pump continuously and quantitatively, gets in the lump in the thermal hydrolysis pipe with the hot water that injects again.
4. the Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation according to claim 1 is characterized in that in said (4) step, the dumper of employing is the dumper that is provided with the perforated plate blow-off valve.
5. the Continuous Heat hydrolysis pretreatment technology of strengthening the excess sludge high-temperature anaerobic fermentation according to claim 1 is characterized in that, in said (5) step, the mud solid content after cyclonic separator is handled is 10-13%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396815A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院城市环境研究所 | Method for preparing carbon materials by use of sludge |
| CN103880259A (en) * | 2012-12-19 | 2014-06-25 | 同济大学 | Method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge |
| CN104071956A (en) * | 2014-07-01 | 2014-10-01 | 青岛畅恒环保技术有限公司 | Pretreatment method for continuous flow of sludge or organic solid waste |
| CN104843963A (en) * | 2015-05-20 | 2015-08-19 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN105347637A (en) * | 2015-12-14 | 2016-02-24 | 北京洁绿科技发展有限公司 | Continuous sludge pyrohydrolysis system and method |
| CN105948448A (en) * | 2016-06-22 | 2016-09-21 | 湖南大学 | System and method for promoting hydrolysis of PAM (polyacrylamide) in dewatered sludge and simultaneously producing short-chain fatty acids |
Citations (3)
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|---|---|---|---|---|
| CN1569699A (en) * | 2004-04-26 | 2005-01-26 | 清华大学 | Process for treating excess sludge |
| JP2009101293A (en) * | 2007-10-23 | 2009-05-14 | Toshiba Corp | Sludge treatment system |
| CN101948228A (en) * | 2010-10-15 | 2011-01-19 | 北京科技大学 | High-temperature anaerobic fermentation process method for pretreating municipal sludge by using industrial waste heat |
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2012
- 2012-01-09 CN CN 201110409702 patent/CN102515466B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569699A (en) * | 2004-04-26 | 2005-01-26 | 清华大学 | Process for treating excess sludge |
| JP2009101293A (en) * | 2007-10-23 | 2009-05-14 | Toshiba Corp | Sludge treatment system |
| CN101948228A (en) * | 2010-10-15 | 2011-01-19 | 北京科技大学 | High-temperature anaerobic fermentation process method for pretreating municipal sludge by using industrial waste heat |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880259A (en) * | 2012-12-19 | 2014-06-25 | 同济大学 | Method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge |
| CN103880259B (en) * | 2012-12-19 | 2016-04-20 | 同济大学 | Utilize calcium peroxide to promote sludge hydrolytic and improve the method for anaerobic sludge digestion effect |
| CN103396815A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院城市环境研究所 | Method for preparing carbon materials by use of sludge |
| CN104071956A (en) * | 2014-07-01 | 2014-10-01 | 青岛畅恒环保技术有限公司 | Pretreatment method for continuous flow of sludge or organic solid waste |
| CN104843963A (en) * | 2015-05-20 | 2015-08-19 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN104843963B (en) * | 2015-05-20 | 2017-01-18 | 江苏沐淼环保科技有限公司 | Quick starting method of high-grade thermal-hydrolysis digestion system |
| CN105347637A (en) * | 2015-12-14 | 2016-02-24 | 北京洁绿科技发展有限公司 | Continuous sludge pyrohydrolysis system and method |
| CN105948448A (en) * | 2016-06-22 | 2016-09-21 | 湖南大学 | System and method for promoting hydrolysis of PAM (polyacrylamide) in dewatered sludge and simultaneously producing short-chain fatty acids |
| CN105948448B (en) * | 2016-06-22 | 2019-05-21 | 湖南大学 | A kind of method PAM hydrolysis in promotion dewatered sludge while producing short chain fatty acids |
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