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[目的]探讨发酵条件对产沼气的影响。[方法]以新鲜猪粪为原料,采用批量进料的方法,研究了7个处理(pH值分别为5.5、6.0、6.5、7.0、7.5、8.0、8.5)对厌氧发酵产气量、产气特性的影响。[结果]不同pH处理发酵都能启动。以pH值6.5启动最快,其次是7.0,其余pH处理启动较慢。各处理的pH值上升到6.5的时间为11 d(pH值7.0)1、2 d(pH值6.5)3、0 d(pH值7.5)3、2 d(pH值6.0)。pH值7.0和pH值6.5的60 d总产气量最高,pH值6.0次之,pH值5.5最低。pH值7.0处理的CH4含量最高,达78.0%,与其他处理差异极显著;pH值6.5处理的CH4含量最大为62.0%;其余各处理CH4含量50.0%左右,差异不显著。[结论]发酵体系的pH值为6.5~7.0,可促进厌氧发酵的启动,提高产沼气的质量。
[Objective] The research aimed to discuss the influence of fermentation conditions on biogas production. [Method] With fresh pig manure as raw material and batch feed method, the effects of seven treatments (pH 5.5, 6.0, 6.5, 7.0, 7.5, 8.0 and 8.5) Effect of characteristics. [Result] Different pH treatments could start fermentation. The fastest was started at pH 6.5, followed by 7.0, and the rest of the pH treatments started slowly. The pH of each treatment increased to 6.5 for 11 d (pH 7.0) for 1, 2 d (pH 6.5) 3,0 d (pH 7.5) for 3 and 2 d (pH 6.0). The total gas production for 60 days at pH 7.0 and pH 6.5 was the highest at pH 6.0 and lowest at pH 5.5. The content of CH4 in pH7.0 was the highest (78.0%), which was significantly different from other treatments. The highest CH4 content was 62.0% at pH6.5, and the other CH4 content was about50.0%, the difference was not significant. [Conclusion] The pH value of fermentation system was 6.5-7.0, which could promote the start of anaerobic fermentation and improve the quality of biogas production.