Abstract:

In view of the situation that China scattered villages were lack of fund and water treatment technical personnel and the directly discharge of rural domestic wastewater had seriously affected the quality of the rural water environment in China. The combined process of up-flow anaerobic bio-filter and greenhouse constructed wetland was used to treat the rural domestic sewage. The results showed that the optimum hydraulic retention time for UAF was 12 h, the volume loading was 0.632-0.936 kg/(m3?d), the average removal efficiency of COD was 56%; In the conditions of the outdoor temperature between -5 and 10℃ (in winter and spring), the HRT for the greenhouse constructed wetlands was 3 days. The combined process showed excellent removal efficiency with COD 75%, BOD5 84%, SS 93%, NH3-N 63% and TP 46%. Except TP, the effluent quality was qualified to the I-class B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The process had many advantages, such as low consumption of energy resources, low investment, low running cost and simple maintenance, so it could be used to treat rural domestic sewage and be expended.