Method for strengthening anaerobic digestion of sludge by utilizing pre-alcoholization of kitchen waste

Abstract

The invention relates to a method for strengthening anaerobic digestion of sludge by utilizing kitchen waste pre-alcoholization. The method mainly comprises the following steps: (1) performing ethanolpre-fermentation on kitchen wastes, namely feeding uniformly crushed kitchen wastes into an alcohol production phase reactor, adding yeast or adjusting the pH value and the like to make the kitchen wastes subjected to rapid and efficient anaerobic fermentation to produce ethanol, and respectively collecting fermentation liquor and fermentation residues; (2) pretreating sludge: mixing the sludge with kitchen waste fermentation residues, and then carrying out pretreatment; and (3) carrying out anaerobic digestion to produce methane: mixing the pretreated product with the kitchen waste fermentation liquor, and carrying out anaerobic digestion in a methane production phase reactor to produce methane. The invention provides a novel thought of synergistic anaerobic digestion, and ethanol in thekitchen waste fermentation liquor can enrich electroactive microorganisms in a methanogenesis phase, so that the interspecific electron transfer rate of the microorganisms is increased, and the methanogenesis efficiency is improved. According to the invention, through a multiphase reaction, resource recovery and biogas upgrading are enhanced while sludge and kitchen waste are effectively treated.

Description

technical field

[0001] The invention relates to the field of organic waste treatment and resource utilization, in particular to a method for strengthening anaerobic digestion of sludge by prealcoholization of kitchen waste. Background technique

[0002] Social development and human activities have produced a large amount of organic waste. In China, more than 100 million tons of kitchen waste and 60 million tons of urban sludge are produced every year. Sustained development must solve the problem. Anaerobic digestion technology is the mainstream technology for the treatment of organic waste. It realizes resource recovery while promoting the reduction, stabilization and harmlessness of organic waste. An important technical guarantee for the construction of a zero-waste city. In the anaerobic digestion process of organic waste, complex organic components need to undergo a series of biochemical steps such as hydrolysis, acidification, and acetic acidification to become small m...

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