Effects of Different Initial PH Values on Mixed Anaerobic Fermentation of Cabbage Tail and Sheep Manure
The effects of different initial pH on mixed anaerobic fermentation of cabbage tail and sheep manure were investigated to provide a theoretical basis for the pretreatment technology of vegetable tail methane project.Using a self-made small-scale fermentation device,with cabbage tail as the main raw material,an appropriate amount of sheep manure was added to prevent acidification of the fermentation system,resulting in stagnation of gas production.The cabbage tail and sheep manure were mixed according to the total solid content(TS)of 2:1,and four different initial pH values were set(T1:pH was not adjusted,pH=7.1±0.1;T2:pH=6.5±0.1;T3:pH=7.5±0.1;T4:pH=8.5±0.1),wet anaerobic fermentation under high temperature conditions(55±1)℃.The effects of different initial pH values on methane-producing efficiency,organic matter hydrolysis in fermentation substrate and stability of fermentation system during mixed fermentation of cabbage tail and sheep manure were studied.Compared with T1,T3 treatment could effectively increase the methane production efficiency of mixed anaerobic of cabbage tail and sheep manure.Under alkaline conditions,it can further promote the hydrolysis of solid organic matter and increase the content of organic matter in the fermentation solution.Each fermentation system can operate stably,which is more conducive to the anaerobic fermentation of cabbage tail and sheep manure.This conclusion can provide some theoretical and practical reference for methane utilization of cabbage tail.
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