Kitchen waste disposal method

Abstract

The invention relates to a kitchen waste disposal method which is characterized by comprising the following steps of: (1) sorting and removing impurities; (2) crushing a mixture the particle diameter of which is not greater than 8mm; (3) centrifugally separating to obtain a light phase and a heavy phase; (4) centrifugally separating the light phase into grease and a high-concentration solution; (5) hydrating for pulping and acidifying: carrying out water mill on the heavy phase and the high-concentration solution to prepare dense slurry and carrying out hydrolysis acidification on the dense slurry to obtain ground masses; and (6) carrying out anaerobic fermentation in an upflow anaerobic sludge bed to obtain methane. Compared with the prior art, the invention mainly improves the content of organic matter in the materials and greatly reduces the biogas residue yield through sorting, impurity removal and crushing; the grease which is not easy to acidified is removed through the centrifugal separation process and the oil and water separation process, which is beneficial to carrying out anaerobic fermentation; the insoluble organic matter is gradually converted into solvable organic matter through the hydration pulping process and the hydrolysis acidification process, and thereby, the anaerobic fermentation gas yield is improved, the sludge load factor is high and the biogas residue yield is very low.

Description

technical field [0001] The invention relates to a treatment method for kitchen waste. Background technique [0002] At present, domestic food waste treatment methods are mainly resource-oriented, and the most widely used methods are landfill treatment, feed method, traditional composting treatment, incineration treatment and pyrolysis. Compared with aerobic composting and feed production, anaerobic fermentation has greater advantages in the treatment of food waste. The biogas produced by anaerobic fermentation can be effectively utilized as an energy source while reducing CO 2 、CH 4 and other greenhouse gas emissions; the reaction process requires an anaerobic state, so the reaction equipment is airtight, and there will be no more odors; the amount of residue produced after fermentation is small, and the cost of subsequent treatment and transportation is also low. Relatively low; for food waste with high moisture content, especially the food waste produced by restaurants ...

AI Technical Summary

Problems solved by technology

[0003]The traditional anaerobic fermentation treatment of food waste is generally to sort the sundries directly for anaerobic fermentation, or to mechanically pulverize and carry out anaerobic fermentation after sorting. Large-scale treatment is difficult, the gas production rate is not high, the sludge load rate is low, and the biogas residue is produced in a large amount. Large-scale discharge is required after a period of time, which is easy to cause the accumulation of kitchen waste

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