Reaction system and method for treating sludge and kitchen garbage

Abstract

The invention provides a reaction system and a method for treating sludge and kitchen garbage. The reaction system comprises a thermal hydrolysis reaction device and an anaerobic digestion reaction device; through a thermal hydrolysis reaction, rupture of cells in the sludge is promoted so as to facilitate full decomposition of organic matters in the sludge; the anaerobic digestion reaction device comprises an anaerobic digestion reaction kettle, a feed hopper for receiving the kitchen garbage and the sludge, and a feeding push rod connected with the feed hopper, and a spiral feed pipe of the anaerobic digestion reaction kettle and matched with the spiral feed pipe. The sludge and the kitchen garbage are conveyed into the feed hopper according to different proportions by mass, the sludge and the kitchen garbage enter the anaerobic digestion reaction kettle through the spiral feed pipe, and the solid content Q of a mixture in the anaerobic digestion reaction kettle is controlled to be 5-25%, so that the organic matter removing rate and the gas yield are effectively improved, the influence of external air on the anaerobic digestion reaction can be avoided, and thus a better synergistic effect of treating the kitchen garbage and the sludge is achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a reaction system and method for treating sludge and kitchen waste. Background technique [0002] The treatment of municipal sludge is an important topic of urban environmental protection. The use of anaerobic bacteria to decompose organic matter in sludge is an important technical means, and this process can also achieve the purpose of biogas production. However, ordinary municipal sludge has low organic matter content, low gas production, and high operating costs; while kitchen waste is rich in organic matter, which can easily breed mosquitoes, flies, and germs if not handled properly, bringing great environmental health risks. [0003] In addition, most of the sludge currently undergoing anaerobic digestion has not been pretreated, and the organic matter in the sludge mainly exists in various types of cells. The amount of gas produced is small; on the oth...

AI Technical Summary

Problems solved by technology

However, ordinary municipal sludge has low organic matter content, low gas production, and high operating costs; while kitchen waste is rich in organic matter, which can easily breed mosquitoes, flies, and germs if not handled properly, bringing great environmental health risks

[0003] In addition, most of the sludge currently undergoing anaerobic digestion has not been pretreated, and the organic matter in the sludge mainly exists in various types of cells. The amount of gas produced is small; on the other hand, at this stage, the sludge anaerobic digestion reaction device mostly uses an excessive storage hopper. The sludge in the storage hopper falls into the reaction kettle below, and it is difficult to avoid air entering during the feeding process, which affects the reaction process

Images