CN112077115A - Kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system - Google Patents

Kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system Download PDF

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Publication number
CN112077115A
CN112077115A CN202010846803.4A CN202010846803A CN112077115A CN 112077115 A CN112077115 A CN 112077115A CN 202010846803 A CN202010846803 A CN 202010846803A CN 112077115 A CN112077115 A CN 112077115A
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China
Prior art keywords
anaerobic fermentation
dry
extrusion
wet
screening
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CN202010846803.4A
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Chinese (zh)
Inventor
郑苇
闵海华
高波
康建邨
李波
马换梅
陈子璇
赵毅
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North China Municipal Engineering Design and Research Institute Co Ltd
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North China Municipal Engineering Design and Research Institute Co Ltd
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Priority to CN202010846803.4A priority Critical patent/CN112077115A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00Operations not covered by a single other subclass or by a single other group in this subclass

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The utility model provides a kitchen garbage extrusion screening preliminary treatment + dry/wet anaerobic fermentation processing technology system, includes extrusion screening preliminary treatment system, dry-type anaerobic fermentation jar and wet-type anaerobic fermentation jar, extrusion screening preliminary treatment system is connected the constitution by bag breaking machine, magnet separator, one-level screening machine, breaker, extrusion liquid solid separating centrifuge loop through the conveyer, the thick liquid that extrusion liquid solid separating centrifuge produced passes through screw pump and pipeline and is connected with wet-type anaerobic fermentation jar, and the solid sediment of production passes through plunger pump and pipeline and is connected with dry-type anaerobic fermentation jar. The system replaces a secondary screening system with a crushing and extruding process, can reduce the loss of perishable organic matters, adapts to the change of garbage components, improves the resource utilization rate, reduces the energy consumption of the system, saves the investment and the operation cost, and solves the problems of poor adaptability of the garbage component change, high investment and operation cost and the like of the traditional treatment process system.

Description

Kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system
Technical Field
The invention belongs to the technical field of garbage treatment, and particularly relates to a kitchen garbage extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system.
Background
The kitchen waste belongs to perishable waste, the property and the composition of the kitchen waste are influenced by a plurality of factors such as sources, local living habits, economic conditions, seasons, resident classification consciousness and throwing accuracy, the change is large, particularly, along with the development of household waste classification, the throwing accuracy rate of residents is improved, waste impurities are gradually reduced, the content of organic matters is gradually increased, the water content is increased, TS is reduced, and pure dry anaerobic operation and maintenance are very difficult. However, the kitchen waste is in a starting stage due to classification in the current stage of China, the impurity content is high, the TS content is a development stage which is inevitably experienced, and the garbage classification is promoted in view of future social progress, so that the impurity content of the kitchen waste is reduced. Therefore, the kitchen waste treatment process needs to meet the current waste characteristic requirements and adapt to the influence of the change of waste components.
At present, the domestic main stream treatment process of kitchen waste adopts a process of 'two-stage screening pretreatment + dry anaerobic digestion', wherein a pretreatment system mainly comprises a bag breaking system, a magnetic separation iron removal system, a primary screening system, a secondary screening system and a dry anaerobic system, the original kitchen waste is subjected to bag breaking by the bag breaking system in sequence, then enters the primary screening system to perform primary screening on the kitchen waste after iron removal, screen underflow with the size of less than or equal to 100 and 120mm enters the secondary screening system to be further screened, the screen underflow with the size of less than or equal to 40-60mm enters the dry anaerobic fermentation system, and the screen underflow is transported for disposal. The kitchen waste treatment system has the following problems: 1) because a large amount of easily degradable organic matters are adhered to the oversize materials, the loss of the easily degradable organic matters is large, and the resource utilization cannot be realized to the maximum extent; 2) due to the fact that only screening pretreatment is carried out, undersize is greatly influenced by the composition of original materials, the requirement of solid content of a dry anaerobic feeding tank is difficult to meet when the water content of garbage is improved, operation and maintenance of the tank body are influenced, and deposition and scum are easy to form; 3) the garbage enters the dry anaerobic fermentation tank for a large amount of materials, so that the volume of the dry anaerobic fermentation tank is increased, and the unit investment and the operation cost are increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a kitchen garbage extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system, which replaces a secondary screening system with a crushing and extrusion process, can reduce the loss of perishable organic matters, adapt to the change of garbage components, improve the resource utilization rate, reduce the energy consumption of the system, save the investment and the operation cost, and solve the problems of poor adaptability of the garbage component change, high investment and operation cost and the like of the traditional treatment process system.
As conceived above, the technical scheme of the invention is as follows: a kitchen garbage extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system is characterized in that: including extrusion screening pretreatment systems, dry-type anaerobic fermentation jar and wet-type anaerobic fermentation jar, extrusion screening pretreatment systems is connected to form by bag breaker, magnet separator, one-level screening machine, breaker, extrusion liquid solid separating centrifuge loop through the conveyer, the thick liquid that extrusion liquid solid separating centrifuge produced passes through screw pump and pipeline and is connected with wet-type anaerobic fermentation jar, and the solid sediment of production passes through plunger pump and pipeline and is connected with dry-type anaerobic fermentation jar.
Further, the bag breaking machine adopts a roller bag breaking machine with a cutter head.
Furthermore, the magnetic separator adopts a permanent magnet suspension type magnetic separator.
Furthermore, the primary screening machine adopts a screw screening machine with a rod distance capable of being adjusted finely.
Furthermore, the crusher adopts a double-cutter shaft reverse rotation crusher, and the size of the crushed material is less than or equal to 50 mm.
Furthermore, the extrusion liquid-solid separator adopts a spiral extrusion liquid-solid separator, the grain diameter of the slurry is less than or equal to 12mm, and the solid content of the solid residues is more than or equal to 30%.
The invention provides a kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system, which has the following advantages:
1. the bag breaking machine and the crusher both have positive and negative rotation functions, can effectively avoid winding, and ensure long-term stable operation.
2. The primary screening machine adopted by the invention adopts a screw sieve, has stronger adaptability to wet garbage with higher viscosity, can avoid the problem of blockage of sieve pores of the conventional drum screening machine, and ensures long-term stable operation; the screw sieve keeps materials rolling and rubbing in the separation process, so that organic matters adhered to oversize materials can be reduced, more perishable garbage enters a subsequent working section, and the maximum resource utilization rate is ensured; meanwhile, the solid content of discharged solid slag can be adjusted by adjusting the screw extrusion pressure so as to adapt to the change of the water content caused by the change of the components of the kitchen garbage and ensure the solid content requirement of the materials entering the dry anaerobic fermentation system.
3. The wet anaerobic fermentation tank adopted by the invention has the advantages of low investment, low operation cost, stable operation and easy control.
4. The squeezable liquid-solid separator in the pretreatment system of the invention can separate slurry, thereby reducing the overall investment and operating cost of the project.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: the device comprises a bag breaking machine 1, a magnetic separator 2, a primary sieving machine 3, a crusher 4, an extrusion liquid-solid separator 5, a screw pump 6, a plunger pump 7, a wet anaerobic fermentation tank 8, a dry anaerobic fermentation tank 9 and a conveyor 10.
Detailed Description
The invention is further described with reference to the accompanying drawings in conjunction with the embodiments.
The invention provides a kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system, which consists of an extrusion screening pretreatment system, a dry anaerobic fermentation tank and a wet anaerobic fermentation tank. The extrusion screening pretreatment system is composed of a bag breaking machine 1, a magnetic separator 2, a primary screening machine 3, a crusher 4 and an extrusion liquid-solid separator 5 which are sequentially connected through a conveyor 10, slurry generated by the extrusion liquid-solid separator 5 is connected with a wet anaerobic fermentation tank 8 through a screw pump 6, generated solid residues are connected with a dry anaerobic fermentation tank 9 through a plunger pump 7, the particle size of the slurry is less than or equal to 12mm, and the solid residue solid content is greater than or equal to 30%.
The bag breaking machine 1 adopts a roller bag breaking machine with a cutter head, and can rotate forwards and backwards to avoid winding and blocking.
The magnetic separator 2 adopts a permanent magnet self-unloading suspension type magnetic separator to automatically separate ferromagnetic substances with the weight of 0.1-25 kg.
The primary screening machine 3 adopts a screw screening machine with rod distance capable of being finely adjusted, the size of undersize materials is less than or equal to 120mm, and good screening effect of wet materials can be guaranteed.
The crusher 4 adopts a double-cutter shaft reverse rotation crusher, the size of a crushed object is less than or equal to 50mm, and the crushed object can rotate forward and backward to avoid winding and blocking.
The extrusion liquid-solid separator 5 adopts a spiral extrusion liquid-solid separator, the grain diameter of the slurry is less than or equal to 12mm, and the solid content of the solid residues is more than or equal to 30%.
The working process of the invention is as follows: the bag breaking machine 1 breaks the bags of the bagged kitchen garbage to scatter the materials, and uniformly spreads the materials for magnetic separation and primary screening. After ferromagnetic metals of the broken kitchen garbage are removed by a magnetic separator 2, the materials are conveyed to a primary sieving machine 3 through a conveyor 10, impurities with the particle size larger than 120mm are sieved, undersize materials with the particle size smaller than or equal to 120mm are conveyed to a crusher 4 through the conveyor 10, the materials are crushed to be smaller than or equal to 50mm, the crushed materials are conveyed to an extrusion liquid-solid separator 5 through the conveyor 10, the materials are divided into slurry with the particle size smaller than or equal to 12mm and solid residues with the particle size of 12-50mm, and the solid content of the solid residues is larger than or equal to 30%.
The slurry discharged by the extrusion liquid-solid separator is sent to a wet anaerobic fermentation tank for fermentation treatment through a screw pump, and the solid residue is sent to a dry anaerobic fermentation tank for fermentation treatment through a plunger pump. Part of the digestion residues generated by the dry anaerobic fermentation flows back to the dry anaerobic fermentation tank again, and other anaerobic digestion residues are discharged to the next section.
The bag breaking machine, the primary screening machine, the crusher, the extrusion liquid-solid separator and the conveyor can be respectively provided with a closed cover, the blanking exposed parts of the magnetic separator are respectively provided with a local exhaust pipeline, and exhausted gas is sent to the deodorization unit for treatment.
The invention can make the perishable garbage enter the anaerobic fermentation system to the maximum extent, and ensures the adaptability of the kitchen garbage component change, improves the impact resistance of the material moisture content and the stability and reliability of long-term operation. Meanwhile, the dry anaerobic feeding amount is reduced, so that the system investment is reduced, the energy consumption is saved, the operation cost is saved, and the technical and economic advantages are obvious.
Although the present invention has been described above, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, which falls within the protection of the present invention.

Claims (6)

1. A kitchen garbage extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system is characterized in that: including extrusion screening pretreatment systems, dry-type anaerobic fermentation jar and wet-type anaerobic fermentation jar, extrusion screening pretreatment systems is connected to form by bag breaker, magnet separator, one-level screening machine, breaker, extrusion liquid solid separating centrifuge loop through the conveyer, the thick liquid that extrusion liquid solid separating centrifuge produced passes through screw pump and pipeline and is connected with wet-type anaerobic fermentation jar, and the solid sediment of production passes through plunger pump and pipeline and is connected with dry-type anaerobic fermentation jar.
2. The kitchen waste extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system as claimed in claim 1, wherein: the bag breaking machine is a roller bag breaking machine with a cutter head.
3. The kitchen waste extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system as claimed in claim 1, wherein: the magnetic separator adopts a permanent magnet suspension type magnetic separator.
4. The kitchen waste extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system as claimed in claim 1, wherein: the primary screening machine adopts a screw screening machine with rod distance capable of being finely adjusted.
5. The kitchen waste extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system as claimed in claim 1, wherein: the crusher adopts a double-cutter shaft reverse rotation crusher, and the size of crushed materials is less than or equal to 50 mm.
6. The kitchen waste extrusion screening pretreatment + dry/wet anaerobic fermentation treatment process system as claimed in claim 1, wherein: the extrusion liquid-solid separator adopts a spiral extrusion liquid-solid separator, the grain diameter of the slurry is less than or equal to 12mm, and the solid-residue solid content is more than or equal to 30%.
CN202010846803.4A 2020-08-21 2020-08-21 Kitchen waste extrusion screening pretreatment and dry/wet anaerobic fermentation treatment process system Pending CN112077115A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112496013A (en) * 2020-12-30 2021-03-16 浙江丽庭环境科技有限公司 Kitchen waste anaerobic composting fermentation reduction treatment method
CN112588795A (en) * 2020-12-30 2021-04-02 浙江丽庭环境科技有限公司 Kitchen waste reduction pretreatment method
CN113145609A (en) * 2021-03-15 2021-07-23 哈尔滨工业大学 Sequencing batch type pretreatment system and method for anaerobic digestion of high-solid-content kitchen garbage
CN113399434A (en) * 2021-06-29 2021-09-17 同济大学 Kitchen waste cooperative wet and dry anaerobic digestion treatment system and treatment method
CN113680798A (en) * 2021-08-25 2021-11-23 南京万德斯环保科技股份有限公司 System and method for cooperatively treating garden garbage and kitchen garbage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921703A (en) * 2012-11-09 2013-02-13 北京嘉博文生物科技有限公司 Kitchen garbage pre-treatment technology and system thereof
CN103008327A (en) * 2012-12-03 2013-04-03 城市建设研究院 Kitchen waste pretreatment method and equipment thereof
CN107513540A (en) * 2017-09-08 2017-12-26 中国华电科工集团有限公司 A kind of integrated form anaerobic ferment process and system
WO2018047200A1 (en) * 2016-09-06 2018-03-15 Arvind Mallinath Lali A process for generation of biogas from organic matter via its liquefaction to liquid biocrude
CN108687103A (en) * 2018-04-19 2018-10-23 菲德克(天津)环保科技有限公司 A kind of preprocess method of kitchen garbage
CN111318552A (en) * 2020-03-30 2020-06-23 中国联合工程有限公司 Kitchen waste pretreatment device and pretreatment method
CN111365715A (en) * 2020-03-25 2020-07-03 江苏天楹环保能源成套设备有限公司 Kitchen waste and food and beverage waste collaborative incineration treatment system and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921703A (en) * 2012-11-09 2013-02-13 北京嘉博文生物科技有限公司 Kitchen garbage pre-treatment technology and system thereof
CN103008327A (en) * 2012-12-03 2013-04-03 城市建设研究院 Kitchen waste pretreatment method and equipment thereof
WO2018047200A1 (en) * 2016-09-06 2018-03-15 Arvind Mallinath Lali A process for generation of biogas from organic matter via its liquefaction to liquid biocrude
CN107513540A (en) * 2017-09-08 2017-12-26 中国华电科工集团有限公司 A kind of integrated form anaerobic ferment process and system
CN108687103A (en) * 2018-04-19 2018-10-23 菲德克(天津)环保科技有限公司 A kind of preprocess method of kitchen garbage
CN111365715A (en) * 2020-03-25 2020-07-03 江苏天楹环保能源成套设备有限公司 Kitchen waste and food and beverage waste collaborative incineration treatment system and method
CN111318552A (en) * 2020-03-30 2020-06-23 中国联合工程有限公司 Kitchen waste pretreatment device and pretreatment method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112496013A (en) * 2020-12-30 2021-03-16 浙江丽庭环境科技有限公司 Kitchen waste anaerobic composting fermentation reduction treatment method
CN112588795A (en) * 2020-12-30 2021-04-02 浙江丽庭环境科技有限公司 Kitchen waste reduction pretreatment method
CN113145609A (en) * 2021-03-15 2021-07-23 哈尔滨工业大学 Sequencing batch type pretreatment system and method for anaerobic digestion of high-solid-content kitchen garbage
CN113145609B (en) * 2021-03-15 2022-11-15 哈尔滨工业大学 Sequencing batch type pretreatment system and method for anaerobic digestion of high-solid-content kitchen garbage
CN113399434A (en) * 2021-06-29 2021-09-17 同济大学 Kitchen waste cooperative wet and dry anaerobic digestion treatment system and treatment method
CN113680798A (en) * 2021-08-25 2021-11-23 南京万德斯环保科技股份有限公司 System and method for cooperatively treating garden garbage and kitchen garbage

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Application publication date: 20201215