CN111112282A - Improved biochemical treatment method for kitchen waste - Google Patents
Improved biochemical treatment method for kitchen waste Download PDFInfo
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- CN111112282A CN111112282A CN201911285431.6A CN201911285431A CN111112282A CN 111112282 A CN111112282 A CN 111112282A CN 201911285431 A CN201911285431 A CN 201911285431A CN 111112282 A CN111112282 A CN 111112282A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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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- General Health & Medical Sciences (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to an improved biochemical treatment method of kitchen waste, which mainly comprises the following steps: (1) the kitchen waste enters a mechanical sorting device firstly to remove non-degradable impurities, and the separated percolate is collected and then sent into an anaerobic methane generating device; (2) feeding the kitchen waste treated by the mechanical sorting device into a biological hydrolysis device, dissolving and separating biodegradable organic matters, feeding the generated organic slurry into an anaerobic biogas generating device, and feeding the residual solid-phase materials into a biogas residue drying device; (3) performing anaerobic biogas production on the percolate and the organic slurry in an anaerobic biogas production device, conveying biogas into a biogas purification device for deodorization and desulfurization, and conveying the biogas into a biogas power generation device for power generation; (4) and (3) sending the biogas residues of the anaerobic biogas generating device into a biogas residue drying device, and sending the dried solid into a thermal power generation device for incineration. The method can effectively remove harmful substances in the kitchen waste, saves land resources, utilizes the biomass and simultaneously reduces urban pollution.
Description
Technical Field
The invention belongs to the technical field of garbage treatment, and particularly relates to an improved biochemical treatment method for kitchen garbage.
Background
In the past, the national execution standard for garbage classification is not strict, the treatment of kitchen garbage does not pay due attention, and the kitchen garbage and household garbage are generally merged and buried for treatment.
Kitchen waste is generally subdivided into food and beverage waste and kitchen waste. The former is garbage commonly called swill, mainly remains after meal such as leftovers, soup and water, and the like, because of different regions, different dietary habits and different components of food garbage, the seafood content of shells and the like in regions near the sea is high, and the chafing dish in southwest regions is a main living habit and has high oil content.
The kitchen waste is food leftovers discarded by families, hotels, restaurants, organs, enterprises, institutions, restaurants and the like, and perishable solid waste kitchen waste such as discarded fruits, vegetables, melon and fruit peels and the like is used as waste generated in the food processing process in a kitchen and food waste left during eating, is organic waste generated by each family and individual during daily life, and accounts for 36-73% of the weight of the household waste. The high water content, high organic content and high inorganic salt content of these wastes reduce the quality of the resource products.
The existing kitchen waste treatment methods (such as documents: the state of the art and suggestions [ J ], Guangdong chemical industry, 2018) mainly comprise:
(1) anaerobic digestion technology: anaerobic digestion (or anaerobic fermentation) is a multi-population and multi-level biological process for organic matters in an anaerobic environment. The technology has good safety, can effectively recover biomass energy, does not have the problem of homology, organic matters are changed into methane and carbon dioxide, a terminal product (methane) is clean energy, and the market prospect is good; the disadvantages are large engineering investment, many difficulties in process technology, large biogas slurry amount and high treatment cost.
(2) Burying: most of domestic kitchen wastes are generally transported to the suburb together with other wastes to be buried. This is the main method for treating solid waste in most countries. The kitchen waste contains a plurality of degradable components, the existing state is unstable, the ability of land used for landfill to be reused can be recovered, and meanwhile, the operation is simple and the popularization is easy. However, because the kitchen waste contains a lot of water, the penetrating fluid is increased, and the disposal difficulty is increased; in addition, the reduced land required for China to meet the treatment standards will also increase costs. The method of pure landfill no longer meets the economic requirement and the environmental protection requirement.
(3) Aerobic composting: the method is a modern composting process, and utilizes microorganisms such as bacteria, actinomycetes and fungi widely distributed in the nature and artificially cultured engineering bacteria to enable organic garbage to generate biological stabilization effect, carry out decomposition and anabolism and effectively kill pathogenic bacteria. It has the advantages of high temperature, thorough decomposition of matrix, short composting period, less peculiar smell, large-scale mechanical treatment, etc. But the produced fertilizer is not easy to popularize and has a long capital recovery period.
(4) The biochemical treatment technology comprises the following steps: the microbial biochemical treatment machine technology is characterized in that high-temperature compound microbial strains with strong natural life activity and multiplication capacity are selected, and organic wastes such as livestock and poultry meat, expired food, food waste and the like are subjected to high-temperature high-speed fermentation in biochemical treatment equipment, so that various organic matters are completely degraded and converted. However, the existing biochemical treatment technology can not effectively treat the residual solid-phase materials, and the existing development requirements of China can not be met by adopting simple landfill.
Disclosure of Invention
The invention aims to provide an improved biochemical treatment method of kitchen waste, which aims to solve the problem that solid-phase materials are difficult to treat and dispose after biochemical treatment in the prior art.
The purpose of the invention is realized by the following technical scheme:
an improved biochemical treatment method for kitchen waste is characterized by mainly comprising the following steps: (1) firstly, feeding the kitchen waste into a mechanical sorting device, removing non-degradable impurities, and collecting separated percolate and then feeding the percolate into an anaerobic methane generating device;
(2) the kitchen waste treated by the mechanical sorting device is sent into a biological hydrolysis device, biodegradable organic matters are dissolved and separated, the generated organic slurry is sent into an anaerobic methane generating device, the rest solid-phase material is sent into a methane residue drying device, and the dried solid is sent into a thermal power generation device for incineration;
(3) the leachate and the organic slurry are anaerobically produced in the anaerobic methane production device, the produced methane is sent into the methane purification device for deodorization and desulfurization, and the purified methane is sent into a methane power generation device for power generation;
(4) and the biogas residue of the anaerobic biogas generating device is sent into the biogas residue drying device, and the dried solid is sent into a thermal power generation device for incineration.
Preferably, the biogas residue drying device is a thin layer drying machine.
The invention has the advantages that: by using the method of the invention to treat the kitchen waste, harmful substances in the kitchen waste can be effectively removed, land resources are saved, and environmental pollution is reduced; biogas generated by the anaerobic system can enter a biogas power plant, biogas residues can enter a thermal power plant after being dried, biomass is effectively utilized, urban pollution is reduced, and certain economic benefits are achieved.
Drawings
FIG. 1 is a flow chart of the biochemical treatment of the improved kitchen waste of the present invention;
in the figure: 1-kitchen waste, 2-mechanical sorting device, 3-biological hydrolysis device, 4-slurry pretreatment device, 5-anaerobic biogas production device, 6-biogas purification device, 7-biogas residue drying device, 8-biogas power generation device, 9-sewage treatment system and 10-thermal power generation device.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not to be used as a limitation of the present invention, and changes and modifications of the embodiment can be made within the scope of the claims of the present invention.
As shown in fig. 1. An improved biochemical treatment method for kitchen waste mainly comprises the following steps:
(1) firstly, feeding the kitchen waste 1 into a mechanical sorting device 2, and collecting separated percolate and then feeding the percolate into an anaerobic methane generating device 5; in the process, recyclable resources such as plastics, glass, fabrics and metals are sorted out, and non-degradable sundries are removed, so that the stable and efficient operation of the subsequent biochemical treatment process is ensured, the loss of biodegradable organic matters is reduced, and the recovery rate of biogas resources is improved;
(2) the kitchen waste pretreated by the mechanical sorting device 2 is sent into a biological hydrolysis device 3, biodegradable organic matters in the food waste are dissolved into a liquid phase by using the combined action of biology, machinery and water power, the generated organic slurry is sent into an anaerobic biogas generating device through solid-liquid separation, the residual solid-phase material has certain combustion value due to containing a large amount of organic matter components and is sent into a biogas residue drying device 7, and the dried solid is sent into a thermal power generation device 10 for incineration power generation;
(3) the leachate and the organic slurry are anaerobically produced in the anaerobic methane production device 5, the produced methane is sent to a methane purification device 6 for deodorization and desulfurization, and the purified methane is sent to a methane power generation device 8 for power generation;
(4) and the biogas residues of the anaerobic biogas generating device 5 are sent to a biogas residue drying device 7 for drying, and the dried solids are sent to a thermal power generation device 10 for incineration power generation.
Further, the leachate and the organic slurry pass through a slurry pretreatment device 4, solid impurities in the fluid are removed, then the leachate and the organic slurry are sent to an anaerobic biogas generating device 5, and the solid impurities are sent to a biogas residue drying device 7.
Further, the slurry pretreatment device 4 is a grating machine, preferably a grating machine with a rake tooth grating gap of 1-10 mm.
Further, the wastewater and waste liquid of the anaerobic methane generating device 5, the methane purifying device 6 and the methane slag drying device 7 are sent to a sewage treatment system 9 for purification treatment.
Further, the residual solid-phase materials of the biological hydrolysis device 3 and the residual sludge of the sewage treatment system 9 are mixed and then sent into the biogas residue drying device 7, and the dried materials are sent into a thermal power generation device 10 and can be mixed with coal for thermal power generation.
Example 1
The kitchen waste in a large residential district is firstly put into a mechanical separator to separate recyclable resources such as plastics, glass, fabrics and metals and non-degradable sundries, and the separated percolate is collected and then sent into an anaerobic methane-generating reactor;
the kitchen waste pretreated by the mechanical separator is sent into a biological hydrolysis device, biodegradable organic matters in the food waste are dissolved into a liquid phase under the combined action of biology, machinery and water power, organic slurry and solid-phase materials are formed through solid-liquid separation, the solid-phase materials are combined with residual sludge of a sewage treatment system, and the mixture is sent into a biogas residue drying device for drying;
separating solid from organic slurry by a grating machine with rake teeth and grating gaps of 5mm, then feeding the organic slurry into an anaerobic methane-generating reactor for anaerobic methane generation, feeding the generated methane into a methane deodorization box and a desulfurization tank, and feeding the purified methane into a methane power plant for power generation;
wastewater and waste liquid generated by the anaerobic methane-generating reactor, the methane deodorization box, the desulfurization tank and the thin-layer drier are sent into a sewage treatment system for purification treatment;
biogas residues generated in the anaerobic biogas production reactor, residual sludge of a sewage treatment system and residual solid-phase materials of the biological hydrolysis device are all sent into a thin-layer drier for drying, and dried solids are sent into a thermal power plant to be co-fired with coal for power generation.
During test operation, the kitchen waste reduction rate is greater than 70%, the plastic recovery rate is stabilized at about 20%, the glass recovery rate is stabilized at about 1%, the textile recovery rate is stabilized at about 8%, the metal recovery rate is stabilized at about 0.1%, each system operates stably, the gas yield of the primary garbage in the anaerobic digestion system can reach 80m for each year at most, the daily yield of the methane can reach 22000m for each year/d at most, the methane content of the produced methane is stabilized at about 56%, and the purified methane can meet the normal use of a methane generator.
Claims (6)
1. An improved biochemical treatment method for kitchen waste is characterized by mainly comprising the following steps: (1) firstly, feeding the kitchen waste (1) into a mechanical sorting device (2) to remove non-degradable impurities, and collecting separated percolate and then feeding the percolate into an anaerobic methane generating device (5);
(2) the kitchen waste treated by the mechanical sorting device (2) is sent into a biological hydrolysis device (3), biodegradable organic matters are dissolved and separated, the generated organic slurry is sent into an anaerobic biogas generating device (5), the rest solid-phase materials are sent into a biogas residue drying device (7), and the dried solid is sent into a thermal power generation device (10) for incineration;
(3) the leachate and the organic slurry are anaerobically produced in the anaerobic methane production device (5), the produced methane is sent into a methane purification device (6) for deodorization and desulfurization, and the purified methane is sent into a methane power generation device (8) for power generation;
(4) the biogas residues of the anaerobic biogas generating device (5) are sent to a biogas residue drying device (7), and the dried solids are sent to a thermal power generation device (10) for incineration.
2. The improved biochemical treatment method for the kitchen waste according to claim 1, characterized in that the biogas residue drying device (7) is a thin layer dryer.
3. The improved biochemical treatment method for the kitchen waste according to claim 1, characterized in that the leachate and the organic slurry pass through a slurry pretreatment device (4), solid impurities in the fluid are removed, and then the leachate and the organic slurry are sent to the anaerobic biogas generating device (5), and the solid impurities are sent to the biogas residue drying device (7).
4. The improved biochemical treatment method for the kitchen waste according to claim 1, characterized in that the slurry pretreatment device (4) is a grating machine.
5. The improved biochemical treatment method for the kitchen waste according to claim 1, characterized in that the wastewater and waste liquid of the anaerobic methane generating device (5), the methane purifying device (6) and the methane slag drying device (7) are sent to a sewage treatment system (9) for purification treatment.
6. The improved biochemical treatment method for the kitchen waste according to claim 1, characterized in that the residual solid-phase material of the biological hydrolysis device (3) is mixed with the residual sludge of the sewage treatment system (9) and then sent into the biogas residue drying device (7), and the dried material is sent into a thermal power generation device (10) to be incinerated for power generation.
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| CN201911285431.6A CN111112282A (en) | 2019-12-13 | 2019-12-13 | Improved biochemical treatment method for kitchen waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115477455A (en) * | 2022-05-12 | 2022-12-16 | 杭州坤灵环境技术有限公司 | Sludge and leachate synergistic full recycling method based on catalytic pyrohydrolysis technology |
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| CN1857802A (en) * | 2006-06-09 | 2006-11-08 | 张志霄 | Integrated biological and incinerating treatment process for dewatered city domestic garbage |
| CN102950137A (en) * | 2011-08-19 | 2013-03-06 | 光大环保科技发展（北京）有限公司 | Kitchen waste collaborative processing method |
| CN104230134A (en) * | 2014-09-23 | 2014-12-24 | 浩蓝环保股份有限公司 | Two-stage biochemical treatment method for kitchen waste |
| CN105861285A (en) * | 2016-06-03 | 2016-08-17 | 北京峻德安装工程有限公司 | Utilization system of municipal sewage sludge, park waste and rural straw waste as resources |
| CN108031697A (en) * | 2017-12-05 | 2018-05-15 | 浙江旺能生态科技有限公司 | A kind of kitchen, method for processing kitchen waste |
-
2019
- 2019-12-13 CN CN201911285431.6A patent/CN111112282A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10290990A (en) * | 1997-04-22 | 1998-11-04 | Matsushita Electric Works Ltd | Combined septic tank |
| CN1857802A (en) * | 2006-06-09 | 2006-11-08 | 张志霄 | Integrated biological and incinerating treatment process for dewatered city domestic garbage |
| CN102950137A (en) * | 2011-08-19 | 2013-03-06 | 光大环保科技发展（北京）有限公司 | Kitchen waste collaborative processing method |
| CN104230134A (en) * | 2014-09-23 | 2014-12-24 | 浩蓝环保股份有限公司 | Two-stage biochemical treatment method for kitchen waste |
| CN105861285A (en) * | 2016-06-03 | 2016-08-17 | 北京峻德安装工程有限公司 | Utilization system of municipal sewage sludge, park waste and rural straw waste as resources |
| CN108031697A (en) * | 2017-12-05 | 2018-05-15 | 浙江旺能生态科技有限公司 | A kind of kitchen, method for processing kitchen waste |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115477455A (en) * | 2022-05-12 | 2022-12-16 | 杭州坤灵环境技术有限公司 | Sludge and leachate synergistic full recycling method based on catalytic pyrohydrolysis technology |
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Application publication date: 20200508 |