沼气池在北方寒冷的冬季有四～六个月的时间不能正常产气,其中有三个月停止产气,而且冬季沼气池的破损率相当高。为了提高北方农村家用沼气池的产气率和冬季的使用率,我们设计试验了以农户为单位的小型生态循环系统,简称“生态 Biogas digesters can not normally produce gas for four to six months in the cold northern winter, of which gas production stops in three months and the digester in winter has a high damage rate. In order to improve the gas production rate and the utilization rate of winter in rural household digesters in northern China, we designed and tested a small-scale ecological circulatory system based on peasant household, referred to as "eco-system