CN112680327B - Organic waste anaerobic digestion efficient treatment system and treatment method thereof - Google Patents
Organic waste anaerobic digestion efficient treatment system and treatment method thereof Download PDFInfo
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- CN112680327B CN112680327B CN202110146625.9A CN202110146625A CN112680327B CN 112680327 B CN112680327 B CN 112680327B CN 202110146625 A CN202110146625 A CN 202110146625A CN 112680327 B CN112680327 B CN 112680327B
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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
- Y02E50/10—Biofuels, e.g. bio-diesel
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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 discloses an organic waste anaerobic digestion high-efficiency treatment system and a treatment method thereof. The invention effectively improves anaerobic fermentation efficiency, improves biogas yield and reduces the sulfur content of biogas.
Description
Technical Field
The invention relates to an anaerobic digestion treatment system and a treatment method thereof, in particular to an organic waste anaerobic digestion efficient treatment system and a treatment method thereof, belonging to the field of garbage treatment.
Background
With the rapid development of the restaurant industry and the promotion of garbage classification work, the proportion and the yield of organic wastes are rapidly increased. At present, in urban household garbage in China, the organic waste content is up to 30% -50%, the annual production amount is hundreds of tons, and the urban living environment is seriously influenced. The biogas is produced by the organic waste through anaerobic digestion, so that the recycling of the organic waste is realized, the environmental pollution is lightened, and the method has important significance for solving the problem of energy shortage.
However, anaerobic digestion can generate a large amount of residue biogas residues, and besides rich in nutrient components, the biogas residues also contain harmful substances such as pathogenic microorganisms and the like, and secondary pollution of soil and water can be caused after the biogas residues enter the environment. Meanwhile, the content of sulfur in the biogas generated by anaerobic digestion is high, and a complex biogas purification treatment process is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing an efficient treatment system and a treatment method for anaerobic digestion of organic wastes, and the anaerobic digestion efficiency of the organic wastes is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
an organic waste anaerobic digestion high-efficiency treatment system is characterized in that: including blender, anaerobic reactor, pyrolysis reactor, the gas holder, first check valve, the second check valve, gaseous aspirator and circulating pump, anaerobic reactor discharge gate is connected with the pyrolysis reactor feed inlet, pyrolysis reactor's biological charcoal discharge gate and blender access connection, the blender export is connected with the feed inlet of anaerobic reactor, pyrolysis reactor's gaseous discharge gate and gas holder access connection, gas holder exit linkage second check valve one end, the second check valve other end is connected with the air inlet of first check valve one end and gaseous aspirator, anaerobic reactor's liquid level upside intercommunication is connected to the other end of first check valve, anaerobic reactor's liquid level below is connected to the one end of circulating pump, gaseous aspirator's feed inlet is connected to the other end of circulating pump, anaerobic reactor is connected to the exit linkage of gaseous aspirator.
Further, a biogas outlet at the upper end of the anaerobic reactor is connected with a biogas utilization unit through a pipeline.
Further, the feed inlet of the anaerobic reactor is arranged at the lower end of one side of the anaerobic reactor, and the discharge outlet of the anaerobic reactor is arranged at the lower end of the other side of the anaerobic reactor.
Further, a dehydrator and a dryer are arranged between the discharge port of the anaerobic reactor and the pyrolysis reactor, the discharge port of the anaerobic reactor is connected with the inlet of the dehydrator through a pipeline, the solid outlet of the dehydrator is connected with the inlet of the dryer, and the outlet of the dryer is connected with the feed port of the pyrolysis reactor.
Further, the sewage outlet of the dehydrator is connected with a sewage treatment system through a pipeline.
Further, a heat exchanger and a condenser are arranged between the pyrolysis reactor and the gas holder, a gas outlet of the pyrolysis reactor is connected with one end of one path of the heat exchanger through a pipeline, the other end of one path of the heat exchanger is connected with an inlet of the condenser through a pipeline, the other path of the heat exchanger is connected with a dryer, and a gas outlet of the condenser is connected with an inlet of the gas holder through a pipeline.
Further, a liquid outlet of the condenser is connected with the oil-water separator through a pipeline.
Further, the ratio of the gas and the liquid of the gas aspirator is 10-40: 1.
an efficient treatment method for anaerobic digestion of organic wastes is characterized by comprising the following steps:
step one: mixing different types of organic wastes, entering an anaerobic reactor, allowing fermented biogas residues to enter a dehydrator for dehydration after the residence time of 25 days in the anaerobic reactor, allowing the dehydrated biogas residues to enter a dryer for drying the biogas residues at 80 ℃, and allowing filtrate generated by dehydration to enter a sewage treatment system;
step two: the dried biogas residue is conveyed to a pyrolysis reactor, synthesis gas and biochar are generated after the biogas residue is subjected to pyrolysis reaction under the reaction condition of 450 ℃, the generated biochar enters a mixer, and the generated synthesis gas enters a heat exchanger;
step three: the synthetic gas enters a condenser to be condensed and then enters a gas holder 12 to be buffered, the synthetic gas is mixed with methane generated by anaerobic digestion through a second one-way valve and then enters a gas aspirator to be mixed with methane liquid from a circulating pump, the ratio of the gas to the methane liquid is 10:1, and finally the gas-liquid mixture enters an anaerobic reactor.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the invention, the biogas residues after anaerobic digestion of the organic wastes are utilized to generate the biochar, and the biochar is mixed with the organic materials and then enters the anaerobic reactor, so that the sulfide content in the biogas can be reduced by more than 15%, and the biogas purification treatment cost is effectively reduced. After the biochar enters the anaerobic reactor, the formed specific strain is used for immobilizing the biochar, so that sulfide in the biogas can be adsorbed and removed; meanwhile, the biochar has adsorption capacity on sulfides in the biogas.
2. According to the invention, part of generated biogas and synthetic gas generated by pyrolysis of biogas residues are mixed with circulating biogas slurry, and biochar generated by pyrolysis of biogas residues is mixed with feed and then enters the anaerobic reactor, so that the biogas yield can be improved by more than 20%, and the anaerobic digestion efficiency of organic wastes can be effectively improved.
3. The invention utilizes the biochar and the synthetic gas generated by the pyrolysis of the biogas residues to recycle the biochar and the synthetic gas in the anaerobic digestion system of the organic waste, thereby not only realizing the recycling of the anaerobic digested biogas residues to the maximum extent, but also effectively improving the efficiency of producing methane by the anaerobic digestion of the organic waste.
Drawings
FIG. 1 is a schematic diagram of an efficient treatment system for anaerobic digestion of organic waste in accordance with the present invention.
Detailed Description
In order to explain in detail the technical solutions adopted by the present invention to achieve the predetermined technical purposes, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that technical means or technical features in the embodiments of the present invention may be replaced without inventive effort, and the present invention will be described in detail below with reference to the accompanying drawings in combination with the embodiments.
As shown in fig. 1, the high-efficiency treatment system for anaerobic digestion of organic wastes comprises a mixer 1, an anaerobic reactor 3, a pyrolysis reactor 8, a gas holder 12, a first one-way valve 16, a second one-way valve 13, a gas aspirator 14 and a circulating pump 15, wherein a discharge port 4 of the anaerobic reactor 3 is connected with a feed port of the pyrolysis reactor 8, a biochar discharge port of the pyrolysis reactor 8 is connected with an inlet of the mixer 1, an outlet of the mixer 1 is connected with a feed port 2 of the anaerobic reactor 3, a gas discharge port of the pyrolysis reactor 8 is connected with an inlet of the gas holder 12, an outlet of the gas holder 12 is connected with one end of the second one-way valve 13, the other end of the second one-way valve 13 is connected with one end of the first one-way valve 16 and an air inlet of the gas aspirator 14, the other end of the first one-way valve 16 is connected with the upper side of the liquid surface of the anaerobic reactor 3, one end of the circulating pump 15 is connected with the lower part of the liquid surface of the anaerobic reactor 3, the other end of the circulating pump 15 is connected with a liquid inlet of the gas aspirator 14, and an outlet of the gas aspirator 14 is connected with the anaerobic reactor 3. The invention can realize the efficient recycling of the organic waste, maximally realize the recycling utilization of the anaerobic digestion biogas residues, improve the biogas yield of an anaerobic digestion system and the content of methane in the biogas, improve the anaerobic digestion efficiency and effectively solve the problems of unstable anaerobic digestion and low gas yield of the current organic waste. Simultaneously, the fund investment and the biogas purification cost of biogas residue disposal are effectively reduced, and the economic efficiency of the anaerobic digestion system is further improved.
The biogas outlet at the upper end of the anaerobic reactor 3 is connected with a biogas utilization unit 17 through a pipeline. The feed inlet 2 of the anaerobic reactor 3 is arranged at the lower end of one side of the anaerobic reactor 3, and the discharge outlet 4 of the anaerobic reactor 3 is arranged at the lower end of the other side of the anaerobic reactor 3.
A dehydrator 5 and a dryer 6 are arranged between the discharge port 4 of the anaerobic reactor 3 and the pyrolysis reactor 8, the discharge port 4 of the anaerobic reactor 3 is connected with the inlet of the dehydrator 5 through a pipeline, the solid outlet of the dehydrator 5 is connected with the inlet of the dryer 6, and the outlet of the dryer 6 is connected with the feed inlet of the pyrolysis reactor 8. The sewage outlet of the dehydrator 6 is connected with a sewage treatment system 7 through a pipeline.
A heat exchanger 9 and a condenser 10 are arranged between the pyrolysis reactor 8 and the gas holder 12, a gas outlet of the pyrolysis reactor 8 is connected with one end of one path of the heat exchanger 9 through a pipeline, the other end of one path of the heat exchanger 9 is connected with an inlet of the condenser 10 through a pipeline, the other path of the heat exchanger 9 is connected with the dryer 6, and a gas outlet of the condenser 10 is connected with an inlet of the gas holder 12 through a pipeline.
The liquid outlet of the condenser 10 is connected with the oil-water separator 11 through a pipeline. The ratio of gas to liquid of the gas aspirator 14 is 10-40: 1.
an efficient treatment method for anaerobic digestion of organic wastes comprises the following steps:
step one: after different types of organic wastes are mixed by a mixer 1, the organic wastes enter an anaerobic reactor 3 through a feed inlet 2, after the residence time of 20-30 days in the anaerobic reactor 3, fermented materials are discharged from a discharge hole 4 and enter a dehydrator 5 to dehydrate biogas residues after anaerobic digestion, the dehydrated biogas residues enter a dryer 6, the dehydrated biogas residues are dried under the condition of 60-90 ℃, the water content is dried to be lower than 30%, and filtrate generated by dehydration enters a sewage treatment system 7.
Step two: the dried biogas residue is conveyed to a pyrolysis reactor 8, and synthesis gas (CO and H) is generated after the biogas residue is subjected to pyrolysis reaction under the reaction condition of 300-500 DEG C 2 、CO 2 Etc.) and biochar, the produced biochar enters the mixer 1, the produced synthesis gas enters the heat exchanger 9, and the waste heat can be conveyed to a dryer for reuse.
Step three: the water after the synthetic gas enters the condenser 10 and is condensed enters the oil-water separator 11, and the condensed synthetic gas enters the gas holder 12 for buffering. The synthetic gas generated by pyrolysis of biogas residues passes through a one-way valve 13, the biogas generated by anaerobic digestion passes through a one-way valve 14, and is mixed with biogas slurry from a circulating pump 15 and then enters a gas aspirator 14 for mixing, the ratio of gas to biogas slurry is 10:1, and finally the gas-liquid mixture enters an anaerobic reactor 3.
Step four: the biogas generated by the anaerobic reactor of the organic material enters the biogas utilization unit 17, and the purified biogas can be combusted to generate steam, combusted to generate electricity or purified and sold in a grid connection mode.
According to the invention, the biogas residues after anaerobic digestion of the organic wastes are utilized to generate the biochar, and the biochar is mixed with the organic materials and then enters the anaerobic reactor, so that the sulfide content in the biogas can be reduced by more than 15%, and the biogas purification treatment cost is effectively reduced. After the biochar enters the anaerobic reactor, the formed specific strain is used for immobilizing the biochar, so that sulfide in the biogas can be adsorbed and removed; meanwhile, the biochar has adsorption capacity on sulfides in the biogas. According to the invention, part of generated biogas and synthetic gas generated by pyrolysis of biogas residues are mixed with circulating biogas slurry, and biochar generated by pyrolysis of biogas residues is mixed with feed and then enters the anaerobic reactor, so that the biogas yield can be improved by more than 20%, and the anaerobic digestion efficiency of organic wastes can be effectively improved. The invention utilizes the biochar and the synthetic gas generated by the pyrolysis of the biogas residues to recycle the biochar and the synthetic gas in the anaerobic digestion system of the organic waste, thereby not only realizing the recycling of the anaerobic digested biogas residues to the maximum extent, but also effectively improving the efficiency of producing methane by the anaerobic digestion of the organic waste.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (9)
1. An organic waste anaerobic digestion high-efficiency treatment system is characterized in that: including blender, anaerobic reactor, pyrolysis reactor, the gas holder, first check valve, the second check valve, gaseous aspirator and circulating pump, anaerobic reactor discharge gate is connected with the pyrolysis reactor feed inlet, pyrolysis reactor's biological charcoal discharge gate and blender access connection, the blender export is connected with the feed inlet of anaerobic reactor, pyrolysis reactor's gaseous discharge gate and gas holder access connection, gas holder exit linkage second check valve one end, the second check valve other end is connected with the air inlet of first check valve one end and gaseous aspirator, anaerobic reactor's liquid level upside intercommunication is connected to the other end of first check valve, anaerobic reactor's liquid level below is connected to the one end of circulating pump, gaseous aspirator's feed inlet is connected to the other end of circulating pump, anaerobic reactor is connected to the exit linkage of gaseous aspirator.
2. An efficient treatment system for anaerobic digestion of organic waste according to claim 1, wherein: the biogas outlet at the upper end of the anaerobic reactor is connected with a biogas utilization unit through a pipeline.
3. An efficient treatment system for anaerobic digestion of organic waste according to claim 1, wherein: the feed inlet of the anaerobic reactor is arranged at the lower end of one side of the anaerobic reactor, and the discharge outlet of the anaerobic reactor is arranged at the lower end of the other side of the anaerobic reactor.
4. An efficient treatment system for anaerobic digestion of organic waste according to claim 1, wherein: a dehydrator and a dryer are arranged between the discharge port of the anaerobic reactor and the pyrolysis reactor, the discharge port of the anaerobic reactor is connected with the inlet of the dehydrator through a pipeline, the solid outlet of the dehydrator is connected with the inlet of the dryer, and the outlet of the dryer is connected with the feed inlet of the pyrolysis reactor.
5. An efficient processing system for anaerobic digestion of organic waste according to claim 4, wherein: the sewage outlet of the dehydrator is connected with a sewage treatment system through a pipeline.
6. An efficient processing system for anaerobic digestion of organic waste according to claim 4, wherein: a heat exchanger and a condenser are arranged between the pyrolysis reactor and the gas holder, a gas outlet of the pyrolysis reactor is connected with one end of one path of the heat exchanger through a pipeline, the other end of one path of the heat exchanger is connected with an inlet of the condenser through a pipeline, the other path of the heat exchanger is connected with a dryer, and a gas outlet of the condenser is connected with an inlet of the gas holder through a pipeline.
7. An efficient processing system for anaerobic digestion of organic waste according to claim 6, wherein: the liquid outlet of the condenser is connected with the oil-water separator through a pipeline.
8. An efficient treatment system for anaerobic digestion of organic waste according to claim 1, wherein: the ratio of the gas and the liquid of the gas aspirator is 10-40: 1.
9. an efficient treatment method for anaerobic digestion of organic wastes is characterized by comprising the following steps:
step one: mixing different types of organic wastes, entering an anaerobic reactor, allowing fermented biogas residues to enter a dehydrator for dehydration after the residence time of 25 days in the anaerobic reactor, allowing the dehydrated biogas residues to enter a dryer for drying the biogas residues at 80 ℃, and allowing filtrate generated by dehydration to enter a sewage treatment system;
step two: the dried biogas residue is conveyed to a pyrolysis reactor, synthesis gas and biochar are generated after the biogas residue is subjected to pyrolysis reaction under the reaction condition of 450 ℃, the generated biochar enters a mixer, and the generated synthesis gas enters a heat exchanger;
step three: the synthetic gas enters a condenser to be condensed and then enters a gas holder 12 to be buffered, the synthetic gas is mixed with methane generated by anaerobic digestion through a second one-way valve and then enters a gas aspirator to be mixed with methane liquid from a circulating pump, the ratio of the gas to the methane liquid is 10:1, and finally the gas-liquid mixture enters an anaerobic reactor.
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- 2021-02-03 CN CN202110146625.9A patent/CN112680327B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104958865A (en) * | 2015-06-29 | 2015-10-07 | 同济大学 | Biological chemistry-thermochemistry multi-point crosslinking biomass waste processing method and system |
| CN107130003A (en) * | 2017-06-22 | 2017-09-05 | 同济大学 | A kind of method that utilization carbon material improves synthesis gas anaerobic fermentation effect |
| CN110832062A (en) * | 2017-06-23 | 2020-02-21 | 苏伊士集团 | Apparatus and process for the biomethanation of synthesis gas |
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