梯级渗滤人工湿地净化人工湖补水的试验研究

Study on Multi-stage Constructed Wetland for Purification of Make-up Water of Artificial Lake

通过人工强化构建了梯级渗滤人工湿地,并用于处理作为人工湖补水的污水。考察了各级湿地的复氧能力以及对污染物的去除规律和效果。研究表明:第一、二、三级湿地的平均充氧量分别为0.49、0.45、1.50 mg/L;各污染物的主要去除场所则不同,COD、氨氮主要在第一级湿地被去除,TN主要在第二级湿地通过反硝化被去除,TP在各级湿地中的去除效果没有明显差别;湿地稳定运行后,对COD、氨氮、TN、TP的平均去除率分别为75%、75.5%、47%、55%,出水水质可稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准。

Multi-stage constructed wetland was constructed by artificial enhancement and used to treat make-up water of artificial lake. The reoxygenation capacity of different stage wetlands and the re- moval effect of pollutants were investigated. The results show that the average reoxygenation rates of first, second and third stage wetlands are 0.49 rag/L, 0.45 mg/L and 1.50 mg/L respectively. Different pol- lutants are removed in different places： COD and ammonia nitrogen are mainly removed in the first stage wetland; TN is mainly removed in the second stage wetland by denitrification; and the different stage wet- lands have no obvious difference in removal of TP. Under the conditions of stable operation, the average removal rates of COD, ammonia nitrogen, TN and TP are 75% , 75.5% , 47% and 55% respectively, and the effluent quality can meet the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918-2002）.