Zero emission process for treating kitchen wastes

Abstract

The invention discloses a zero emission process for treating kitchen wastes. The zero emission process comprises the following steps: (1) performing solid and liquid separation on the kitchen wastes by using a rotating fine screen, and feeding organic matters obtained after solid and liquid separation into a hermetia illucens breeding system; (2) feeding a liquid phase obtained after solid and liquid separation into an oil and water separating device to perform oil and water separation, and reutilizing the separated crude oil as a raw material; (3) feeding a liquid phase separated by the oil and water separating device into an anaerobic digestion system to perform anaerobic treatment, and transforming organic matters in the liquid phase into marsh gas by using the anaerobic digestion system and then reutilizing the marsh gas; (4) feeding water discharged from the anaerobic digestion system into a sewage treatment system to perform biochemical treatment, removing organic matters and performing biological removal of nitrogen; (5) feeding the water discharged from the sewage treatment system into an ultra-filtration system for further treatment; (6) sequentially feeding the water discharged from the ultra-filtration system into a nano-filtration system and a reverse osmosis system to perform advanced treatment, removing refractory organic matters and then discharging. The zero emission process for treating kitchen wastes, disclosed by the invention, is capable of realizing reclamation of kitchen waste treatment.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a zero-discharge process for treating kitchen waste. Background technique [0002] Food waste treatment is an emerging environmental protection proposition in China. Food waste treatment processes at home and abroad mainly include anaerobic digestion, aerobic composting, direct drying as feed, and microbial treatment technologies. [0003] Food waste has the characteristics of high water content, high oil content, and high organic content. No matter what kind of process is faced with the problem of food waste leachate treatment, if the existing process is to meet the direct discharge standard, it must use reverse osmosis, etc. Membrane equipment brings the problem of concentrated liquid. If the food waste treatment plant is close to the incineration plant, the concentrated liquid can be sprayed back to the incinerator. If it is close to the landfill, the landfill ca...

AI Technical Summary

Problems solved by technology

The process of drying as feed is basically not used in China because of the homology problem that people worry about. The aerobic composting process is also used in a small range because the fertilizer outlet needs to be well connected with the downstream. The most used anaerobic digestion process is because of biogas products. There are no good domestic cases in terms of resource utilization. At the same time, a large amount of biogas residues are produced in the anaerobic digestion process, and most of them are disposed of in landfills at present.

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