Kitchen waste processing system and method

Abstract

The invention discloses a kitchen waste processing system and method. The kitchen waste processing method comprises the following steps: a kitchen waste receiving and transporting trolley pours kitchen waste into a kitchen waste receiving hopper; solid-phase waste in the receiving hopper is conveying to a smashing unit through a screw conveyor; the smashed solid-phase waste in a closed pipeline isconveyed to a first-stage presser via a valve plunger pump; the solid-phase substance obtained through first-stage pressing is conveyed to a second-stage presser for second-stage pressing through theclosed pipeline; the solid-phase impurities obtained through second-stage pressing and separating are discharged externally in the closed pipeline, and after centralized collection, the solid-phase impurities are externally transported for treatment; slurry and receiving hopper leachate obtained through two stages of pressing are conveyed to a wet type anaerobic digestion tank with high solid content; and organic slurry generates methane, biogas slurry and biogas residue under the action of anaerobic digestion. The kitchen waste processing method improves the capacity of wet type anaerobic digestion in a break-through manner, overturns the pretreatment concept in the existing kitchen waste processing method, obtains an unexpected technical effect, and greatly increases the economic benefit and the ecological benefit.

Description

technical field [0001] The invention relates to the fields of garbage classification and biomass natural gas, in particular to a kitchen waste treatment system and treatment method. Background technique [0002] As early as 2010, the National Development and Reform Commission, the Ministry of Housing and Urban-Rural Development, the former Ministry of Environmental Protection, and the former Ministry of Agriculture organized and carried out pilot work on the resource utilization and harmless treatment of urban kitchen waste. As of the end of 2015, there were at least 118 food waste treatment facilities (above 50t / d) that were put into operation, under construction, or under construction (approved projects), with a total treatment capacity of more than 21,500 t / d. The scale of centralized treatment facilities for food waste is generally 100-200t / d. Due to the single technical route, poor technical economy, lack of management policies, and immature operating model in the kitc...

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Problems solved by technology

[0008] In addition, the existing patent literature also records the processing method of kitchen waste, but there are certain problems

(1) The patent number is 201210373025.7, and the invention name is the invention patent of kitchen waste treatment method. The disadvantages of this technical solution are: 1. The process is complicated and requires a lot of equipment

3. The economy of this process is very poor, and the degree of resource utilization is low. The resource product after garbage treatment is only crude oil

The disadvantage of this method is that a large amount of water is added when disposing of garbage, which is equivalent to causing new water pollution when disposing of garbage, which violates the essence of environmental protection

(3) The patent number is 201711266828.1, and the name of the invention is an invention patent for a method of disposing of kitchen waste and kitchen waste. ) Garbage is preliminarily broken through a bag breaker; after breaking the bag, the kitchen (kitchen waste) waste is further crushed by a crusher to reduce the size of the material", which shows that the performance of the crusher selected in this patent is relatively poor; 2. Documents "The broken kitchen (kitchen waste) garbage is sent back to the transfer bin for 8-12 hours. During the period of rest, the material is turned over intermittently, and proteolytic enzymes are sprayed on the surface of the material while turning over." This shows that The anaerobic digestion ability of this patent is not strong; 3. It is recorded in the document that "the obtained organic wet pulp is transported to the hydraulic pulp washer to complete the pulp washing, remove the heavy sand and light scum in the material, and obtain the organic matter content High, uniform material", which shows that this patented technology does not solve the problem of impurity removal in anaerobic digestion

(4) The patent number is 201822002836.1, and the name of the invention is a utility model patent for a kitchen waste treatment system. This patent adopts the current domestic mainstream technology, and the pretreatment adopts the screening mode, and the anaerobic capacity is low. Before oxygen digestion, multiple processes of homogenization, acidification, and fine adjustment are required. The overall process is complex and there are many failure points

(5) The patent number is 201910391994.7, and the name of the invention is an invention patent for a dry anaerobic fermentation system for kitchen waste. In this patent, it is proposed that the solid content of kitchen waste is about 30%. After sorting, the organic matter The solid content is also as high as 25%. If wet anaerobic digestion is used, a large amount of sewage needs to be added

(6) The patent number is 201910676933.5, and the name of the invention is an invention patent for a high-temperature microbial treatment method for kitchen waste. It adopts the process of wet thermal hydrolysis and press pulping. The disadvantages of this process are: 1. Heating to 150-180 degrees Celsius requires a lot of energy

[0009] To sum up, none of the existing kitchen waste treatment methods can meet the treatment needs of kitchen waste after garbage classification, and the economic benefits are poor.

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