Method for producing biogas through anaerobic digestion of fruit and vegetable waste

Abstract

The invention discloses a method for producing biogas through anaerobic digestion of fruit and vegetable waste, and belongs to the field of high-efficiency recycling of organic solid waste. The fruit and vegetable waste is firstly subjected to acidification as well as a high-efficiency extrusion process to realize solid-liquid separation, and then a solid-state product and a liquid-state product are treated respectively. Solid-state residue is subjected to secondary reinforcing acidification to enter a high-efficiency anaerobic digestion methane production reactor together with a liquid-state acidification product; and meanwhile, effluent water of the methanator is used as reflux liquid to be circulated in a solid-state residue secondary reinforcing hydrolytic acidification reactor to speed up the hydrolytic acidification reaction. According to the method, high-efficiency transformation of the waste is realized, and the effluent water in the methanator is pumped into the secondary reinforcing acidification reactor for recycling. The method has the advantages of high treatment rate, high gas production rate, short period, capability of realizing continuous stable gas production, no wastewater discharge and the like.

Description

technical field [0001] The invention belongs to the field of high-efficiency resource utilization of organic solid waste, and relates to a method for producing biogas by efficient anaerobic digestion of fruit and vegetable waste. Background technique [0002] Fruit and vegetable waste mainly refers to fruit peels, residues, vegetable leaves, residues, etc. produced during the processing of fruits and vegetables. About 13 million tons of fruit residues and 50 million tons of vegetable residues are produced in my country every year. Fruit and vegetable wastes have a high moisture content and are easy to rot and deteriorate. cause serious environmental pollution. Fruit and vegetable waste has a high content of organic matter. Using anaerobic digestion technology to treat it can not only eliminate pollution, but also efficiently convert organic matter into clean energy biogas. At present, the research on biogas production from fruit and vegetable waste focuses on traditional sin...

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Problems solved by technology

At present, the research on biogas production from fruit and vegetable waste focuses on traditional single-phase and two-phase anaerobic digestion. The efficiency of single-phase mixed anaerobic digestion is low, and the two-phase anaerobic digestion system achieves two-phase separation under certain conditions. However, due to the characteristics of material heterogeneity and poor fluidity, the hydrolysis process becomes a factor that limits the anaerobic digestion of fruit and vegetable waste. The processing efficiency is low and continuous and stable operation cannot be achieved

At present, there is no patent report on efficient anaerobic digestion of fruit and vegetable waste to produce biogas

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