Decentralized domestic sewage without any treatment is flowing into rivers , lakes and groundwater discretionarily, which make for the pollution of surface water and groundwater circumstance and the destruction of the water zoology.

Study on technics of low-cost treatment for decentralized domestic wastewater;

Optimization of the decentralized sanitation and reuse system;

Based on the present situation of domestic wastewater treatment in South Jiangsu rural area,the three feasible decentralized wastewater treatment technologies including earthworm filter bed,bio-nonwoven fabric reactor,and constructed wetland were put forward.

The concept of sustainable wastewater treatment emphasizing recoveries of energy and resources makes the original decentralized wastewater treatment renewed.

According to the characteristics of decentralized rural domestic sewage,the treatment system is designed for treating rural wastewater with combined technology of hydrolysis acidification-algal pond,the effect of different parameters on efficiency of combined process is discussed.