Method for producing biogas by garbage union fermentation

Abstract

The invention relates to a method for treating organic wastes by anaerobic fermentation, in particular to a method for producing biogas by performing union fermentation on livestock and poultry excrements, sludge from urban sewage treatment factories and organic garbage. The method comprises the following steps of: smashing the organic garbage; putting the smashed organic garbage into a comprehensive pretreatment pool and mixing the smashed organic garbage with the sludge from the urban sewage treatment factories and the livestock and poultry excrements; diluting the mixed materials to form suspension containing 8 to 12 percent of solids by using the sewage in a farm; and ensuring that the pretreated material meets the material feeding requirement of an anaerobic reactor and enters the anaerobic reactor through a material feeding pump and a pipeline to perform fermentation. The biogas produced by fermentation can be directly used as fuel gases for warming or cooking in treatment factories and surrounding farmers after being purified; the residual part is used for generating electricity for self-use or surfing the Internet by an biogas generator unit; biogas liquid and biogas residues are used as organic fertilizers and returned to farm land. By the technique, the scale of construction of the biogas engineering becomes larger, and unit investment and running maintenance cost are reduced by over 10 percent. Compared with the output of biogas produced by separate fermentation of the sludge or livestock and poultry excrements, the output of the biogas produced by the method is obviously enhanced.

Description

technical field

[0001] The invention relates to a method for treating solid waste by anaerobic fermentation, in particular to a biogas production technology by combined fermentation of livestock manure, sludge from urban sewage treatment plants and organic waste. Background technique

[0002] Anaerobic fermentation is to use facultative bacteria and anaerobic bacteria to degrade the organic matter in the reactor under anaerobic conditions, and convert the organic matter into clean energy—biogas, which can organically combine energy, environmental protection and a virtuous cycle of ecology. It has remarkable benefits and is one of the main methods for dealing with organic waste at present. For the treatment of organic waste, at present, my country mainly adopts sanitary landfill and anaerobic fermentation method for treatment. Sanitary landfill has a long history and mature technology for garbage disposal, but the cost is relatively high. The anaerobic fermentation process ...

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