CN112251331A - Dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste and treatment method thereof - Google Patents
Dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste and treatment method thereof Download PDFInfo
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Abstract
The invention discloses a dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste and a treatment method thereof, and relates to the technical field of solid waste treatment, wherein the dry anaerobic fermentation system comprises a receiving hopper for receiving the kitchen waste, the outlet end of the receiving hopper is communicated with a dry and wet separator for separating the kitchen waste into dry and wet types, and the outlet end of the dry and wet separator is sequentially communicated with a crushing pulping machine, a cyclone sand settling device, an impurity removing machine and a two-phase separator; a solid waste residue discharge port of the two-phase separator is communicated with the dry anaerobic fermentation tank, and a wastewater discharge port is communicated with the wastewater pool; the biogas residue discharge port of the dry anaerobic fermentation tank is communicated with a biogas residue dehydrator; the water outlet of the wastewater pond is simultaneously communicated with the water inlet of the pulping machine and the wet anaerobic tank, and the water outlets of the wet anaerobic tank and the biogas residue dehydrator are communicated with the sewage treatment system. The dry-wet separation and impurity removal of the garbage in the treatment facility are achieved, and the separation effect is stable and reliable; the separated dry garbage has high heat value and uniform and stable components.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste and a treatment method thereof.
Background
The kitchen waste is perishable organic waste such as discarded fruit and vegetable and food leftovers, melon and fruit skins in daily life of a family, and discarded fruits and vegetables in farmer fruit and vegetable markets. The kitchen garbage is easy to rot and generate odor, and the water content of the kitchen garbage is about 60-70% (the solid content is about 30-40%). Therefore, the kitchen waste is suitable for adopting the dry anaerobic fermentation technology.
At present, in many cities where garbage classification is carried out, the equipment of the infrastructure is mainly concentrated on the source classification and delivery facilities, and the progress of the classification and disposal facilities of the terminals is gradually advancing. In addition, the front-end classification work is in a starting stage, the quality of classified garbage is not stable, and the tail end treatment process and equipment are prone to faults. Therefore, the operation condition of the tail end disposal project which is matched with the household garbage classification at present is not ideal.
Disclosure of Invention
The invention aims to provide a dry anaerobic fermentation system for dry-wet sorting pretreatment of kitchen garbage, which realizes dry-wet separation and impurity removal of garbage in a treatment facility and has stable and reliable separation effect; the separated dry garbage has high heat value and uniform and stable components, effectively improves the stability during collaborative incineration, and ensures the realization of the reduction target of the household garbage.
The technical purpose of the invention is realized by the following technical scheme:
a dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste comprises a receiving hopper for receiving the kitchen waste, wherein the outlet end of the receiving hopper is communicated with a dry and wet separator for separating the kitchen waste into dry and wet types, and the outlet end of the dry and wet separator is sequentially communicated with a crushing pulping machine, a cyclone sand setting device and a two-phase separator;
the wastewater discharge port of the two-phase separator is communicated with a wastewater pool, and the water outlet of the wastewater pool is communicated with the water inlet of the pulping machine.
Furthermore, the water outlet of the wastewater pond is also communicated with the wet anaerobic tank, and the water outlet of the wet anaerobic tank is communicated with the sewage treatment system.
Furthermore, a solid waste residue discharge port of the two-phase separator is communicated with the dry-type anaerobic fermentation tank, and a biogas residue discharge port of the dry-type anaerobic fermentation tank is communicated with the biogas residue dehydrator; the water outlet of the biogas residue dehydrator is communicated with the sewage treatment system.
Furthermore, a rough separator is connected between the receiving hopper and the dry-wet separator, and impurities in the kitchen garbage are separated out by the rough separator.
Furthermore, the impurities separated by the rough separator comprise plastics, glass and metal.
Furthermore, an impurity removing machine is arranged between the cyclone sand settling device and the two-phase separator.
The invention aims to provide a dry anaerobic fermentation system for dry-wet separation pretreatment of kitchen waste, which takes dry-wet separation and wet pretreatment of the kitchen waste as core processes, the separated dry waste has high heat value and uniform and stable components, the stability during synergetic incineration is effectively improved, and the realization of the reduction target of the household waste is ensured; the solid organic waste residues generated after pretreatment are converted into biogas and biogas residues by adopting a dry anaerobic process, so that harmless and targetless realization is realized, and the resource utilization efficiency of the household garbage is improved.
The technical purpose of the invention is realized by the following technical scheme:
a treatment method of a dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste comprises the following steps:
s1: the kitchen garbage is unloaded to a receiving hopper after being collected and transported by a vehicle, the kitchen garbage in the receiving hopper passes through a rough sorting machine, the rough sorting machine separates out sundries in the kitchen garbage, and the sorted sundries are transported and disposed;
s2: conveying the kitchen waste sorted by the rough sorting machine into a dry-wet separator, and separating the kitchen waste into dry and wet types by the dry-wet separator;
s3: the dry garbage separated in the step S2 is sent to a household garbage incineration plant or a landfill for disposal; wet mixing the separated wet garbage by a crushing pulping machine, separating heavy sand and stone by a cyclone sand setting device, separating light floating impurities by an impurity removing machine, and separating the solid organic waste residue and the waste water by a two-phase separator;
s4: and (4) feeding the wastewater separated by the two-phase separator in the step (S3) into a wastewater tank, feeding the wastewater into a wet anaerobic tank for anaerobic fermentation treatment while supplementing water for a pulping machine, and discharging the wastewater after the wastewater generated by the wet anaerobic tank reaches the standard after the wastewater enters a sewage treatment system for treatment.
Still further, step S5 is also included: and (4) feeding the solid organic waste residue separated in the step (S3) into a dry anaerobic fermentation tank, treating the biogas residue generated by the dry anaerobic fermentation tank by a dehydrator, then feeding the sewage generated by the dehydrator into a sewage treatment system for standard discharge, and feeding the generated biogas residue into an incineration plant or a landfill for disposal.
Furthermore, the sundries generated in the pretreatment process of step S3 are sent to a landfill site of an incineration plant for incineration disposal, and the gravels are transported to an outside for landfill disposal.
In conclusion, the invention has the following beneficial effects:
(1) the invention adopts a dry-wet separation process, avoids the phenomenon that wet garbage and dry garbage are adhered together and are not easy to separate in the subsequent process, and effectively improves the recovery rate of organic matters in the kitchen garbage;
(2) the wet type slurry mixing process and the rotational flow sand setting process are adopted, and the biogas slurry recycled at the tail end of the process is used as a hydraulic medium, so that the separation efficiency of heavy sand stones and light-floating impurities is greatly improved;
(3) solid organic waste residues generated after pretreatment are converted into biogas and biogas residues by adopting a dry anaerobic process, so that harmless and targetless realization is realized, and the resource utilization efficiency of household garbage is improved;
(4) the total amount of the organic waste residue generated by the method is about 25 percent of the total amount of the incoming raw materials, and is far lower than that of the solid organic waste residue (about 50 percent of the incoming raw materials) generated by the traditional combined sorting pretreatment process, so that the total volume of a tank body used in the dry anaerobic process is small, the occupied area is small, and the total amount of the engineering investment is greatly saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1, a receiving hopper; 2. a rough sorting machine; 3. a dry-wet separator; 4. pulping; 5. a cyclone sand settler; 6. a trash remover; 7. a two-phase separator; 8. a dry anaerobic fermentation tank; 9. a biogas residue dehydrator; 10. a wastewater tank; 11. a wet anaerobic tank; 12. a sewage treatment system.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings, and the present embodiment is not to be construed as limiting the invention.
A dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste is shown in figure 1 and comprises a receiving hopper 1 for receiving the kitchen waste, wherein the outlet end of the receiving hopper 1 is communicated with a rough sorting machine 2, the rough sorting machine 2 separates out sundries in the kitchen waste, and the separated sundries comprise plastics, glass, metal and the like.
The outlet end of the rough separator 2 is communicated with a dry-wet separator 3 for separating the kitchen garbage into dry and wet types, and the outlet end of the dry-wet separator 3 is sequentially communicated with a crushing pulping machine 4, a cyclone sand setting device 5, an impurity removing machine 6 and a two-phase separator 7;
a solid waste residue discharge port of the two-phase separator 7 is communicated with the dry anaerobic fermentation tank 8, and a waste water discharge port of the two-phase separator is communicated with a waste water pool 10;
the biogas residue discharge outlet of the dry anaerobic fermentation tank 8 is communicated with a biogas residue dehydrator 9; the water outlet of the wastewater pond 10 is simultaneously communicated with the water inlet of the pulping machine 4 and the wet anaerobic tank 11, and the water outlets of the biogas residue dehydrator 9 and the wet anaerobic tank 11 are both communicated with the sewage treatment system 12.
The specific treatment method comprises the following steps:
s1: the kitchen garbage is unloaded to the receiving hopper 1 after being collected and transported by a vehicle, the kitchen garbage in the receiving hopper 1 passes through the rough sorting machine 2, the rough sorting machine 2 separates out sundries in the kitchen garbage, and the sorted sundries are transported and disposed;
s2: the kitchen waste sorted by the rough sorting machine 2 is conveyed into a dry-wet separator 3, and the kitchen waste is separated into dry and wet types by the dry-wet separator 3;
s3: the dry garbage separated in the step S2 is mainly made of combustible materials such as plastics, paper fibers and the like and is sent to a household garbage incineration plant or a landfill for disposal; the separated wet garbage is sequentially subjected to wet type size mixing by a crushing and pulping machine 4, heavy sand and stone are separated by a cyclone sand setting device 5, light floating impurities are separated by an impurity removing machine 6, solid organic waste residue and waste water are separated by a two-phase separator 7, the impurities generated in the process are sent to a landfill of an incineration plant for incineration disposal, and the sand and stone are transported outside for landfill disposal;
s4: the wastewater separated by the two-phase separator 7 in the step S3 is sent to a wastewater tank 10, the wastewater tank 10 supplies water to the pulping machine 4, and simultaneously the wastewater is sent to a wet anaerobic tank 11 for anaerobic fermentation treatment, and the wastewater generated by the wet anaerobic tank 11 enters a sewage treatment system 12 for treatment and then is discharged after reaching the standard;
s5: and (3) feeding the solid organic waste residue separated in the step (S3) into a dry anaerobic fermentation tank (8) (the dry anaerobic fermentation tank (8) can be used for cooperatively treating organic solid residue generated by a kitchen waste pretreatment system), treating the biogas residue generated by the dry anaerobic fermentation tank by a dehydrator, feeding sewage generated by the dehydrator into a sewage treatment system (12) for treatment, then discharging the sewage after reaching the standard, and feeding the generated biogas residue into an incineration plant or a landfill for treatment.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a dry-type anaerobic fermentation system that kitchen garbage selects separately preliminary treatment futilely wets which characterized in that: the kitchen garbage separating machine comprises a receiving hopper for receiving kitchen garbage, wherein the outlet end of the receiving hopper is communicated with a dry-wet separator for separating the kitchen garbage into dry and wet types, and the outlet end of the dry-wet separator is sequentially communicated with a crushing pulping machine, a cyclone sand setting device and a two-phase separator;
the wastewater discharge port of the two-phase separator is communicated with a wastewater pool, and the water outlet of the wastewater pool is communicated with the water inlet of the pulping machine.
2. The dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste according to claim 1, characterized in that: the water outlet of the wastewater pond is also communicated with the wet anaerobic tank, and the water outlet of the wet anaerobic tank is communicated with the sewage treatment system.
3. The dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste according to claim 1 or 2, characterized in that: a solid waste residue discharge port of the two-phase separator is communicated with the dry anaerobic fermentation tank, and a biogas residue discharge port of the dry anaerobic fermentation tank is communicated with the biogas residue dehydrator; the water outlet of the biogas residue dehydrator is communicated with the sewage treatment system.
4. The dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste according to claim 1, characterized in that: and a rough separator is connected between the receiving hopper and the dry-wet separator and separates out sundries in the kitchen garbage.
5. The dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste according to claim 4, characterized in that: the impurities separated by the rough separator comprise plastics, glass and metal.
6. The dry anaerobic fermentation system for dry and wet sorting pretreatment of kitchen waste according to claim 1, characterized in that: an impurity remover is also arranged between the cyclone sand settling device and the two-phase separator.
7. A treatment method of a dry anaerobic fermentation system based on the dry and wet sorting pretreatment of kitchen waste according to claim 1, characterized in that:
the method comprises the following steps:
s1: the kitchen garbage is unloaded to a receiving hopper after being collected and transported by a vehicle, the kitchen garbage in the receiving hopper passes through a rough sorting machine, the rough sorting machine separates out sundries in the kitchen garbage, and the sorted sundries are transported and disposed;
s2: conveying the kitchen waste sorted by the rough sorting machine into a dry-wet separator, and separating the kitchen waste into dry and wet types by the dry-wet separator;
s3: the dry garbage separated in the step S2 is sent to a household garbage incineration plant or a landfill for disposal; wet mixing the separated wet garbage by a crushing pulping machine, separating heavy sand and stone by a cyclone sand setting device, separating light floating impurities by an impurity removing machine, and separating the solid organic waste residue and the waste water by a two-phase separator;
s4: and (4) feeding the wastewater separated by the two-phase separator in the step (S3) into a wastewater tank, feeding the wastewater into a wet anaerobic tank for anaerobic fermentation treatment while replenishing water to the pulping machine, and discharging the wastewater after the wastewater generated by the wet anaerobic tank reaches the standard after the wastewater enters the sewage treatment system 12 for treatment.
8. The method for processing the dry anaerobic fermentation system for the dry and wet sorting pretreatment of kitchen waste according to claim 7, wherein:
further comprising step S5: and (4) feeding the solid organic waste residue separated in the step (S3) into a dry anaerobic fermentation tank, allowing the biogas residue generated by the dry anaerobic fermentation tank to pass through a dehydrator, allowing the sewage generated by the dehydrator to enter a sewage treatment system 12 for treatment, and discharging the sewage after reaching the standard, and feeding the generated biogas residue into an incineration plant or a landfill for disposal.
9. The method for processing the dry anaerobic fermentation system for the dry and wet sorting pretreatment of kitchen waste according to claim 7, wherein: the sundries generated in the pretreatment process of the step S3 are sent to a landfill site of an incineration plant for incineration disposal, and the gravels are transported outside for landfill disposal.
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| 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 |
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