CN111069236A - Advanced treatment process for kitchen waste - Google Patents
Advanced treatment process for kitchen waste Download PDFInfo
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- CN111069236A CN111069236A CN201911322767.5A CN201911322767A CN111069236A CN 111069236 A CN111069236 A CN 111069236A CN 201911322767 A CN201911322767 A CN 201911322767A CN 111069236 A CN111069236 A CN 111069236A
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- Prior art keywords
- kitchen waste
- treatment process
- advanced treatment
- oxidation
- anaerobic fermentation
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- 239000010806 kitchen waste Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 230000003647 oxidation Effects 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 238000000855 fermentation Methods 0.000 claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012065 filter cake Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 4
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 6
- 244000052616 bacterial pathogen Species 0.000 abstract description 4
- 230000001954 sterilising effect Effects 0.000 abstract description 2
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 1
- 239000010813 municipal solid waste Substances 0.000 description 11
- 230000005611 electricity Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 241000282887 Suidae Species 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 210000003278 egg shell Anatomy 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- -1 hair Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000021190 leftovers Nutrition 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kitchen waste advanced treatment process, which comprises the following steps: (1) feeding the kitchen waste into a crusher for crushing to obtain organic suspension slurry; (2) feeding the organic suspension slurry into an oxidation reactor, introducing oxygen or air into the oxidation reactor, and carrying out oxidation reaction at a temperature of not less than 140 ℃ and under a pressure of more than 1 MPa; (3) carrying out solid-liquid separation on the material obtained in the step (2), such as sending the material into a membrane plate-and-frame filter press for filter pressing, so as to obtain an inorganic residue filter cake and an oxidizing solution; (4) and transferring the oxidation solution into an anaerobic fermentation tank for anaerobic fermentation, and collecting the methane. The invention can realize the high reduction of the kitchen waste, the reduction rate of the obtained inorganic residue can reach more than 95 percent compared with the original kitchen waste, and the thorough sterilization of pathogenic bacteria can be realized.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a kitchen garbage advanced treatment process.
Background
The organic garbage with high humidity (including kitchen garbage, tree branches and leaves and other garden garbage) in the domestic garbage of China accounts for nearly 60%, and 4800 tons of wet garbage can be generated every day in Shanghai alone. The household kitchen garbage and urban food and beverage garbage mainly comprise abandoned vegetable leaves, leftovers, fruit peels, eggshells, tea leaves, bones and the like, are mixed with plastics, paper, cloth, hair, oils, salt, bamboo and wood and the like, and also contain a large amount of pathogenic bacteria. The kitchen waste contains extremely high moisture and organic matters, is easy to decay and deteriorate, generates stink and pollutes other waste components.
The conventional treatment methods all have their drawbacks. Landfills will occupy and pollute large amounts of land, producing large amounts of leachate, malodorous gases and greenhouse gases. Chinese people tend to release a lot of salt when cooking, the salt content of kitchen garbage can reach more than 1-2%, the kitchen garbage corrodes an incinerator, dioxin is increased, and heavy metals in fly ash are easy to leach out. The heat value of the kitchen waste is usually lower than 1000 kcal/kg, and is far lower than that of dry waste (more than 3000 kcal/kg), so that the heat value of incineration power generation can be greatly reduced. If the kitchen waste is converted into livestock feed to feed pigs and poultry, health problems can be caused, and the health of human beings is harmed through a food chain. The traditional composting process generates a large amount of odor, and cannot thoroughly kill germs, the production period is long, a large amount of fields are needed, the product quality is unstable, and the market is not stable.
Disclosure of Invention
In order to solve the problems mentioned in the background art, the invention provides a kitchen waste advanced treatment process, which can realize the high reduction of the kitchen waste and the thorough sterilization of pathogenic bacteria.
A kitchen waste advanced treatment process comprises the following steps:
(1) feeding the kitchen waste into a crusher for crushing to obtain organic suspension slurry;
(2) feeding the organic suspension slurry into an oxidation reactor, introducing oxygen or air into the oxidation reactor, and carrying out oxidation reaction at a temperature of not less than 140 ℃ and under a pressure of more than 1 MPa;
(3) carrying out solid-liquid separation on the material obtained in the step (2) to obtain an inorganic residue filter cake and an oxidizing solution;
(4) and transferring the oxidation solution into an anaerobic fermentation tank for anaerobic fermentation, and collecting the methane.
Further, the temperature of the oxidation reaction in the step (2) is 180-250 ℃.
Further, the pressure in the step (2) is 1-6 MPa.
Further, when the gas for oxidation reaction with the organic suspension slurry in the reactor in the step (2) is air, the air is supplied by an air compressor, and the exhaust pressure of the air compressor is 3-5 MPa.
Further, the solid-liquid separation in the step (3) is separation by pressure filtration of a filter press.
Further, the water content of the inorganic residue filter cake in the step (3) is less than 40%.
Further, the step (4) is to transfer the oxidation liquid into an anaerobic fermentation tank, to insert anaerobic bacteria for anaerobic fermentation, to collect biogas, and to use the biogas for power generation or sale after refining.
The invention has the beneficial effects that:
1. according to the invention, the kitchen waste is crushed and then subjected to oxidation reaction, so that the thorough wall breaking of bacteria and virus cells is realized, the bacteria and the viruses are thoroughly killed, and meanwhile, organic matters in the organic suspension slurry are decomposed into carbon dioxide or micromolecular organic compounds.
2. The invention can realize the high reduction of the kitchen waste, and the reduction rate can reach 95-99%.
3. The filtrate separated by filter pressing is rich in micromolecular organic acid, is suitable for anaerobic biogas production, the produced biogas is used for power generation, the economic benefit is good, and the treatment cost can be further reduced.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
Taking 120 tons of kitchen waste to be treated as an example:
(1) and (3) feeding the kitchen waste into a crusher for crushing to obtain organic suspension slurry, and conveying the organic suspension slurry into a storage tank for storage.
(2) And (2) feeding the organic suspension slurry in the storage tank into an oxidation reactor at a speed of 5 tons/hour by using a 5MPa high-pressure pump, continuously supplying compressed air into the oxidation reactor by using an air compressor, wherein the exhaust pressure of the air compressor is 4.5MPa, the exhaust gas volume is 40 cubic meters per minute, and the organic suspension slurry and the air react under the conditions that the pressure is 4MPa and the reaction temperature is 240 ℃.
(3) And (3) feeding the material obtained in the step (2) into a diaphragm plate-and-frame filter press for filter pressing, and performing solid-liquid separation to obtain an inorganic residue filter cake and an oxidizing solution, wherein the water content of the inorganic residue filter cake is 27%.
(4) Transferring the oxidation solution into an anaerobic fermentation tank, inoculating anaerobic bacteria, performing anaerobic fermentation at 35 deg.C for 8 days, collecting biogas, and using the biogas to generate electricity.
In this example, the weight of the inorganic residue filter cake produced by pressure filtration of the product after the oxidation reaction was 3 tons, and the reduction rate was 97.5%. The final treatment mode of the inorganic residue filter cake can be landfill, land utilization, building material utilization and the like. In addition, 117 tons of oxidizing solution can produce 3200 cubic meters of marsh gas and generate 8700 ℃ of electricity. And (3) the oxidation liquid after anaerobic fermentation biogas production enters an A/O treatment system to be treated and discharged into an urban sewage plant after reaching the urban sewer discharge standard.
The total electricity consumption for treating 120 tons of kitchen waste is 17000 ℃ of electricity, 8300 tons of electricity are obtained after deducting methane generation, the average electricity consumption of each ton of kitchen waste is 69 ℃ in conversion, which is far lower than that of incineration, and the environment-friendly, efficient and economical treatment of the kitchen waste is realized.
Example 2
This example differs from example 1 in that the gas undergoing oxidation with the organic suspension slurry is oxygen and the collected biogas is used for refining and sale.
Wherein, the refining is to desulfurize and decarbonize the collected biogas and then compress the biogas, which is the prior art and is not described in detail herein.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The advanced treatment process of the kitchen waste is characterized by comprising the following steps:
(1) feeding the kitchen waste into a crusher for crushing to obtain organic suspension slurry;
(2) feeding the organic suspension slurry into an oxidation reactor, introducing oxygen or air into the oxidation reactor, and carrying out oxidation reaction at a temperature of not less than 140 ℃ and under a pressure of more than 1 MPa;
(3) carrying out solid-liquid separation on the material obtained in the step (2) to obtain an inorganic residue filter cake and an oxidizing solution;
(4) and transferring the oxidation solution into an anaerobic fermentation tank for anaerobic fermentation, and collecting the methane.
2. The advanced treatment process for kitchen waste as claimed in claim 1, characterized in that the temperature of the oxidation reaction in step (2) is 180-250 ℃.
3. The advanced treatment process for the kitchen waste according to claim 1, characterized in that the pressure in the step (2) is 1-6 MPa.
4. The advanced treatment process of kitchen waste according to claim 1, characterized by that when the gas in the reactor in step (2) which is subjected to oxidation reaction with the organic suspension slurry is air, the air is supplied by an air compressor, and the exhaust pressure of the air compressor is 3-5 MPa.
5. The advanced treatment process of kitchen waste according to claim 1, characterized by that, the solid-liquid separation in step (3) is separation by filter pressing of a filter press.
6. The advanced treatment process for kitchen waste according to claim 1, characterized in that the water content of the inorganic residue filter cake in step (3) is less than 40%.
7. The advanced treatment process of kitchen waste according to claim 1, characterized in that step (4) is specifically to transfer the oxidation liquid into an anaerobic fermentation tank, to which anaerobic bacteria are inoculated for anaerobic fermentation, to collect biogas, and the biogas obtained is used for power generation or refined for sale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322767.5A CN111069236A (en) | 2019-12-20 | 2019-12-20 | Advanced treatment process for kitchen waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322767.5A CN111069236A (en) | 2019-12-20 | 2019-12-20 | Advanced treatment process for kitchen waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111069236A true CN111069236A (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911322767.5A Pending CN111069236A (en) | 2019-12-20 | 2019-12-20 | Advanced treatment process for kitchen waste |
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| Country | Link |
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| CN (1) | CN111069236A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804935A (en) * | 2022-06-04 | 2022-07-29 | 开诚同虹环境科技(上海)有限公司 | Method and system for preparing biochar-based organic fertilizer from kitchen waste |
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|---|---|---|---|---|
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| CN102921704A (en) * | 2012-11-12 | 2013-02-13 | 都市高科（北京）环境科技有限公司 | Harmless disposal method of kitchen garbage |
| CN103350099A (en) * | 2013-07-02 | 2013-10-16 | 王德亭 | Integrated treatment process for kitchen waste |
| CN104259179A (en) * | 2014-09-12 | 2015-01-07 | 海宁市绿洲环保能源有限公司 | Kitchen waste treatment process |
| CN104379754A (en) * | 2012-02-28 | 2015-02-25 | 特瑞克斯有限合伙公司 | Treatment of biomass |
| KR20150004027U (en) * | 2014-04-24 | 2015-11-03 | 양민목 | food waste sterilizer |
| CN106966767A (en) * | 2017-03-30 | 2017-07-21 | 张共敏 | Kitchen garbage energy, Fertilizer Transformed and fodder fusion treatment technique |
| CN110255800A (en) * | 2019-06-27 | 2019-09-20 | 冯露晨 | A kind of medical sewage purifying treatment method |
| CN110331624A (en) * | 2019-08-01 | 2019-10-15 | 江南大学 | A kind of material and preparation method of granular filler moulded paper pulp product |
-
2019
- 2019-12-20 CN CN201911322767.5A patent/CN111069236A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102371266A (en) * | 2010-08-23 | 2012-03-14 | 青岛福瑞斯生物能源科技开发有限公司 | Resource utilization method of kitchen waste |
| CN104379754A (en) * | 2012-02-28 | 2015-02-25 | 特瑞克斯有限合伙公司 | Treatment of biomass |
| CN102921704A (en) * | 2012-11-12 | 2013-02-13 | 都市高科（北京）环境科技有限公司 | Harmless disposal method of kitchen garbage |
| CN103350099A (en) * | 2013-07-02 | 2013-10-16 | 王德亭 | Integrated treatment process for kitchen waste |
| KR20150004027U (en) * | 2014-04-24 | 2015-11-03 | 양민목 | food waste sterilizer |
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| CN106966767A (en) * | 2017-03-30 | 2017-07-21 | 张共敏 | Kitchen garbage energy, Fertilizer Transformed and fodder fusion treatment technique |
| CN110255800A (en) * | 2019-06-27 | 2019-09-20 | 冯露晨 | A kind of medical sewage purifying treatment method |
| CN110331624A (en) * | 2019-08-01 | 2019-10-15 | 江南大学 | A kind of material and preparation method of granular filler moulded paper pulp product |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114804935A (en) * | 2022-06-04 | 2022-07-29 | 开诚同虹环境科技(上海)有限公司 | Method and system for preparing biochar-based organic fertilizer from kitchen waste |
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Application publication date: 20200428 |