Method of fermenting pig manure in biogas digester

Abstract

The invention relates to a method of fermenting pig manure in a biogas digester; the method comprises (1) pretreating pig manure; (2) adjusting carbon-nitrogen ratio; (3) performing anaerobic fermentation. According to the method of fermenting pig manure in the biogas digester, before pig manure is added into the biogas digester, suitable EM (effective microorganisms) are added into the pig manure and are mixed well and fermented by piling, the EM can effectively decompose matters that kill bacteria and greatly inhibit the growth and breeding of methane bacteria, as well as other toxic matters, most of the matters adverse to the fermentation of the pig manure are decomposed into fermentable organic compounds such as proteins and cellulose, some of the proteins provide energy for the growth and breeding of methane bacteria, mass methane bacteria are produced during fermenting, pig manure fermenting speed can be increased, and the pig manure can be fermented completely; suitable tea seed dregs and peanut shells are added into the pig manure, pig manure carbon-nitrogen ratio is suitably increased, and it is avoided that failure of normal fermentation is caused by too low carbon-nitrogen ratio and a stock solution being easy to acidify.

Description

technical field [0001] The invention relates to a method for putting pig manure into a biogas digester for fermentation. Background technique [0002] Pig manure is a good fermentation material for biogas production. However, with the promotion of new pig raising technology, "full-price compound feed" is widely used. In order to make their products grow faster after pigs eat them, they will be sold early and have a good sales market. A variety of elements are added that exceed the national standards. After the pigs eat, there are quite a few elements left in the manure. It is difficult to produce biogas after this kind of pig manure enters the pond. The composition of pig manure was analyzed, and it was found that there were preservatives, insect repellents, salt, copper, selenium, phosphorus, soybean meal, rapeseed meal, bone meal, etc., some of which were high in content and remained in pig manure after eating by pigs. The pig manure contains substances that sterilize an...

AI Technical Summary

Problems solved by technology

However, with the promotion of new pig raising technology, "full-price compound feed" is widely used. Some feed manufacturers, in order to make their products grow faster after pigs eat, sell them early, and have a good sales market, put them in the feed. A variety of elements are added that exceed the national standards. After the pigs eat, there are quite a few elements left in the manure. It is difficult to produce biogas after this kind of pig manure enters the pond.

The composition of pig manure was analyzed, and it was found that there were preservatives, insect repellents, salt, copper, selenium, phosphorus, soybean meal, rapeseed meal, bone meal, etc. Some of the ingredients were high in content, and remained in pig manure after eating by pigs. The pig manure contains substances that sterilize and strongly inhibit the growth and reproduction of methane bacteria and other toxic substances, so that the acid-producing bacteria multiply quickly during the fermentation process, and the methane-producing bacteria multiply slowly, and the decomposition and digestion speed of raw materials exceeds the gas production speed, which is easy to cause organic acid A large amount of accumulation hinders fermentation

Normal biogas fermentation requires a certain carbon-to-nitrogen ratio. When raw materials with low carbon-to-nitrogen ratios such as pig manure, chicken manure, and human manure are used for fermentation alone, the feed liquid of such raw materials is easy to acidify when there are few biogas bacteria, making the fermentation not working properly