Separation and anaerobic fermentation technology of cow dung subject to acidification

Abstract

The invention relates to a separation and anaerobic fermentation technology of cow dung subject to acidification. In the technology, fiber in the cow dung subject to intermediate temperature acidification is separated from fermented liquid raw materials by using a spiral squeeze solid-liquid separator, wherein the acidification technology parameters are as follows: the ratio of cow dung to water is 2:1 for tempering, the tempered total solid content TS is 10-12%, and acidification is carried out at the intermediate temperature condition of 33 DEG C-37 DEG C for 3-4 days; the acidized feed liquid is separated by using the solid-liquid separator; the total solid content TS of the separated solid matters is 38%-45%; organic compound fertilizer and bioorganic compound fertilizer are directly produced; the separated liquid TS is 6.6%-7.4%; and methane producing anaerobic fermentation is carried out by using the separated liquid, wherein the fermentation temperature is 33 DEG C and 37 DEG C, the inoculating amount is 30% when a methane producing phase starts, the charging rate is one seventh of the effective volume of a methane producing reactor, waterpower retention period is 7 days, the feed liquid discharged from the methane producing reactor is post-fermented for 1 day so that the components capable of producing methane in the feed liquid are fully fermented, and the total waterpower retention period is 11-12 days. The technology can improve the methane yield in sludge gas.

Description

technical field [0001] The invention belongs to anaerobic fermentation technology, and mainly relates to an anaerobic fermentation treatment process and method for livestock and poultry breeding manure. Background technique [0002] At present, simple pretreatment and full mixed fermentation methods are mostly used to treat manure from livestock and poultry farms by anaerobic fermentation. Compared with pig manure and chicken manure, cow manure has more crude fiber content and a higher carbon-nitrogen ratio. During the oxygen fermentation process, the crude fiber is difficult to be utilized by anaerobic microorganisms, which affects the gas production efficiency of cow dung fermentation. The economic effects of methane. Contents of the invention [0003] The purpose of the present invention is to overcome the disadvantages of the above-mentioned technologies, and provide a process for separating anaerobic fermentation of cow dung after acidification with high methane yiel...

AI Technical Summary

Problems solved by technology

[0002] At present, simple pretreatment and full mixed fermentation methods are mostly used to treat manure from livestock and poultry farms by anaerobic fermentation. Compared with pig manure and chicken manure, cow manure has more crude fiber content and a higher carbon-nitrogen ratio. During the oxygen fermentation process, the crude fiber is difficult to be utilized by anaerobic microorganisms, which affects the gas production efficiency of cow dung fermentation. The Economic Effects of Methane

Images