| Although wastewater treatment technique had been developed for many years, there are few successful projects in treating rural sewage water were reported. It′s because of the variable collected wastewater quantity due to the scatter distributed discharge sources, as well as the requirements of low cost in building, running and maintaining the treatment system. However, the sewage water in rural area has the characteristics of high COD, high nitrogen and phosphorus and easily be biodegraded. According to those characteristics, in this paper we introduced a high efficiency and low cost treatment system which integrated the techniques of physical settlement, immobilized microorganism, solar energy driven aeration and artificial wetland linearly. Correspondingly a demonstrate project was constructed in Liu Xiangying Village with the capacity of 4000 m3 per day. After be treated by this system, the outlet water had steady nitrogen concentration around 0.82~1.4 mg·L-1, and CODCr concentration was no more than 30 mg·L-1. The rejection of TN and CODCr might reach 90.08%~98.69% and 84.53%~96.74% respectively. The cost of cleaning 1 m3 sewage water was no more than 0.15 yuan RMB. This system could reach the requirements of easy maintained, low cost and high efficiency and was suitable for treating the rural area sewage water. |
