一、引言近年来,为了获得以奶牛粪为原料的沼气发酵的较高产气率,我们在实验室中对其发酵工艺参数进行了大量的研究工作,并建立了几套发酵工艺模式,从而筛选出最佳结果。本文所介绍的新工艺,是将新鲜乳牛粪过滤,即把粪便中的粗糙,难以生物降解的物质筛去,使其消化系统性能得以改进。在中温条件下,甲烷产率为末经筛过的发酵工艺的2～3倍。二、材料与方法1.原料:取自武汉市后湖奶牛场的新鲜牛粪,经当天压榨(10号筛孔),滤汁放入冰箱中 I. INTRODUCTION In recent years, in order to obtain the higher gas production rate of biogas fermentation using cow dung as raw material, we conducted a large amount of research work on the fermentation process parameters in the laboratory and established several fermentation technological modes to screen Out the best result. The new process described in this paper is to filter fresh dairy cow dung, ie, to screen coarse, difficult biodegradable material in the manure to improve its digestive system performance. At medium temperature, methane yields are 2 to 3 times greater than the final sieved fermentation process. Materials and methods 1. Raw materials: Fresh cow dung from Houhu Dairy Farm in Wuhan City was crushed by the day (No. 10 mesh), filtered into the refrigerator