农户庭院型人工湿地对农村生活污水的净化效果

为了探讨人工湿地在农村生活污水处理应用中的可行性,通过在广东省珠海市上洲村建立农户型水平潜流和垂直流人工湿地系统各一套,比较2种人工湿地对农村生活污水净化效果的差异。在运行稳定阶段,2套系统处理出水中COD、BOD5、TP、NH4+-N和TN的平均浓度均达到了城镇污水处理厂排放标准(GB18918-2002)一级A标准。2套系统对农村生活污水的各污染物都具有很好的去除效果。其中,垂直流湿地对COD、BOD5、TP、TN和NH4+-N平均去除率分别为96.10%、96.01%、85.32%、91.18%和82.44%;水平潜流湿地则分别为93.29%、94.41%、86.52%、85.95%和77.46%。统计分析结果表明,垂直流湿地对NH4+-N的去除率高于水平潜流湿地,且其差异达到显著水平;水平潜流湿地对TP的去除率高于垂直流湿地,但其差异未达到显著水平。

Removal efficiencies of rural domestic sewage in household-type constructed wetlands

Research was conducted at Shangzhou village,Zhuhai City,Guangdong Province to investigate the performance and difference of removal efficiencies of pollutants from rural domestic wastewater by building two household-type systems(horizontal-flow constructed wetlands and vertical-flow constructed wetlands).The results showed that the concentrations of COD,BOD5,TP,NH+4-N and TN in the treated effluent from both constructed wetland systems could reach the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB18918-2002) and removal efficiencies were satifactory in both systems.The average removal rates of COD,BOD5,TN,NH+4-N in vertical-flow system were 96.10%,96.01%,91.18% and 82.44%,respectively,while 93.29%,94.41%,85.95% and 77.46%,respectively in horizontal-flow system.Statistics analysis revealed that the removal rate of NH+4-N in vertical-flow system was higher than that of horizontal-flow system,and significant difference(P<0.05) existed between the two systems.The performance for the phosphorus-removal in the horizontal-flow system was better than that of vertical-flow system,but showed no significant difference(P>0.05).