不同人工湿地系统处理生活污水的比较研究

以华南1号杂交狼尾草、海芋、春砂仁、文殊兰、美人蕉、沿阶草、鸢尾和红草为湿地植物,以煤渣、麻石、陶粒为填料构成几种人工湿地系统,对生活污水进行处理研究。结果表明:当进水COD浓度小于345mg/L时,各系统出水COD浓度均小于60 mg/L(停留时间为6 h),达到GB 18918-2002的一级B标准;当进水TP浓度在4.44~8.17 mg/L之间,NH4+-N浓度在41.3 mg/L以下,TN浓度在66.1 mg/L以下时,各系统出水TP、氨氮、总氮浓度分别小于1,25,20 mg/L(停留时间为12h),均达到GB18918-2002的二级B标准。

COMPARISON OF DIFFERENT CONSTRUCTED WETLAND SYSTEMS FOR SEWAGE TREATMENT

Comparison of different constructed wetland systems to treat sewage was carried out.The removal efficiency of main pollutants(COD,TN,TP,NH4+-N) in sewage by eight constructed wetland plants was investigated.Pennisetum americanum 23A×P.purpuerum cv.N51 cv.Huanan No.1,Alocasia macrorrhizos,Amomum villosum,Chinese Crinum,Canna indica,Ophiopogon reversus,Iris tectorum and Alternanthera bettzickiana were used as wetland plants.Ceramic,granite,cinder were used as the fillers.The results showed that when the COD of sewage was 345 mg/L below,the hydraulic residence time(HRT) was 6h,the COD of sewage treated by four constructed wetlands systems less than 60 mg/L.When the TP,NH4+-N and TN of sewage were 4.44~8.17,66.1,41.3 mg/L respectively,and HRT was 12 h,TP,NH4+-N and TN of the effluent from four constructed wetlands systems were less than 1,25,20 mg/L respectively.The effluent quality reaches the classⅡcriteria in The Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).