不同组合基质的垂直流人工湿地对富营养化水体的净化效果

Removal Efficiencies of Vertical Flow Constructed Wetland with Different Carriers on Eutrophic Water Treatment

为研究不同组合基质的垂直流人工湿地净化效果的影响,采用六种基质(大碎石、花岗石、鹅卵石、粗砂、砾石、土壤)构建两种不同组合基质结构的垂直流人工湿地,对富营养化水体进行净化.实验结果表明,以土壤、砾石、花岗岩、大碎石为组合基质的人工湿地系统(CWs1)对TP、PO_4-P、NH_4-N、NO_3-N和NO_2-N的平均去除率分别为58.5%、57.3%、38.5%、21.4%、16.5%;以土壤、粗砂、鹅卵石、大碎石为组合基质的人工湿地系统(CWs2)的平均去除率分别为37.8%、65.2%、45.2%、27.2%、19.6%.组合基质CWs1对磷的去除效果优于CWs2,对氮的去除率低于CWs2;两种组合基质垂直流人工湿地对富营养化水体均具有较好的净化效果,且对磷的去除率高于氮.

In the paper, eutrophic water was treated by applying vertical flow constructed wetland with different carriers, such as large -gravel, pedestrian, pebbles, coarse sand, gravel and soil. The treatment effects of TP, PO4-P, NHa-N, NOa-N and NO2-N were explored. The experimental results indicated that the removal efficiencies ofTP, POa-P, NH4-N, NO3-N and NO2-N are 58.5 % , 57.3% , 38.5% , 21.4% and 16.5% , respectively ,under the experimental conditions of CWsl, while the removal efficiencies of TP, POa-P, NHa-N, NO3-N and NO2-N are 37.8 % , 65.2% , 45.2% , 27.2% and 19.6% , respectively , under the experimental conditions of CWs2. It can be found that the removal efficiencies of CWsl for P removal are better than those of CWs2, while the removal efficiencies of CWsl for N removal are lower than those of CWs2. The good treatment effect of eutrophic water is gained by the processes of vertical flow constructed wetland with different carriers.