According to the theory of circular economy,the basic technological flow and its related structures parameter of night soil treatment in rural middle school are designed in this article.

According to material biogas-producing rate of pig waste, expressions between biogas yields of piggery waste treatment and amount of pig on hand was obtained.

Based on in-depth investigation, research and successful experience in the world,this paper puts forward techniques of pollution prevention and treatment involving solid muck treatment and recycling use, wastewater treatment and multipurpose utilization,and the deodorization in farms.

In view of the fact that the mass concentration of ammonia nitrogen in wastewater from toilet in tourism areas is high,the key factors that influence the improvement of the A/O biological denitrification process was selected by orthogonal experiment,the relativity between key factors and the removal rate of ammonia-nitrogen,as well as the optimal condition for the process were discussed.