The Study On The Ecological And Energy Saving Treatment Technology Of Rural Domestic Wastewater

With a view to meeting the requirement of constructing "the Ecological and Economic Zone of Poyang Lake" in Jiang-Xi province, according to rural sewage treatment experience of Tai Lake and Dian-Chi Lake Basin, An innovative technology called "Anaerobic tank/Jet aeration bio-trickling filter/Constructed wetland" was developed with the advantages of less investment, low energy consumption, high treatment efficiency and easy management. It is a combination with wastewater treatment technologies of anaerobic, biological oxidation by jet aeration and artificial wetland. Phosphorus, nitrogen and other nutrients in rural domestic wastewater could be degraded effectively by tertiary treatment including anaerobic, aerobic and constructed wetland of this technology.Laboratory-scale test carried out from every unit experiment of technical combinations to simulated rural sewage and then raw sewage treated by joint units operation. The results show that removal rates of COD, NH4+-N, TN, TP in rural sewage was up to85.4%,74.5%,75.9%and78.3%, respectively, after treating by this combined process. Post-treatment water quality achieved grade-B of emission standard (GB18918-2002).The pilot test was designed to treat10ton sewage per day with characteristics of low carbon and energy-saving and stable operation automatically without manual control. Preliminary test results demonstrated that the requirement of the major economic and technical indicators of the pilot project had been accomplished:operating cost was below0.12Yuan/ton; removal rate of COD, NH4+-N, TP exceed80%,70%and75%, respectively.The combination process of "Anaerobic tank/jet aeration bio-trickling filter/constructed wetland" was not only introduced to treat rural sewage of the Poyang Lake basin but also could meet needs for other rural sewage treatment in China.