不同种牛粪干发酵产气特性比较试验研究

Experimental study on the characteristics of gas production from dry anaerobic digestion of different kinds of cattle manure

采用干发酵技术处理3种不同种类的牛粪,比较了各种牛粪发酵的日产气量、累计产气量和产甲烷比例的差异。结果表明,相对于水牛粪和黄牛粪,奶牛粪干发酵产气的启动更快;累计产气量和平均容积产气率均以水牛粪为最高,黄牛粪次之,奶牛粪最低;3种牛粪干发酵过程中的产甲烷比例变化趋势大体上相似,在发酵初期由低到高逐渐增加,之后趋于平稳,其中水牛粪的产甲烷比例相对于奶牛粪和黄牛粪略高;总体来看,水牛粪干发酵的产气效果优于奶牛粪和黄牛粪,这为以后的相关研究或沼气工程设计中的原料选取提供了参考。

In this paper,comparative dry fermentation experiments were carried out to investigate the effect of cattle manure species on daily gas production, cumulative gas production and methane content. The results showed that the speed of start-up performance from fastest to slowest were cow manure, buffalo manure, cattle manure in sequence,while as to the cumulative gas production and average volume gas productivity from highest to lowest, they were buffalo manure, cattle manure, cow manure in sequence. The compositions of gas produced from dry fermentation of these three cattle manures were approximately similar. The methane content produced from fermentation of buffalo manure was higher than that from other two manures. Generally speaking, the effect of gas production from buffalo manure was better than that from cattle manure and cow manure. This paper provides reference for feedstocks selection in future related research or biogas engineering design.