不同人工湿地对微污染原水处理效果的研究

Different Constructed Wetlands for Treatment of Micro-polluted Raw Water

采用人工湿地预处理微污染黄河原水,分别研究了推流式潜流人工湿地、往复式潜流人工湿地、芦苇床表流人工湿地、蒲草床表流人工湿地对总氮和COD的去除效果。结果表明,推流式人工湿地和往复式人工湿地对总氮和硝态氮的去除效果无明显差别,但去除率要低于表流人工湿地。蒲草床表流人工湿地对总氮和硝态氮的平均去除率分别为84.33和76.32,去除效果好于芦苇床表流人工湿地。各人工湿地对COD的去除率在30～65之间,不同人工湿地对COD的去除效果差别不明显。人工湿地处理微污染黄河原水的效果明显,出水水质可满足城市供水水源水质标准的要求。

Four kinds of constructed wetlands, including plug-flow subsurface constructed wetland, to-and-fro subsurface constructed wetland, surface-flow constructed wetlands with reed and cattail, were constructed to treat micro-polluted raw water from Yellow River. The removal efficiencies of TN and COD were investigated. The results show that the plug-flow subsurface constructed wetland and to-and-fro subsurface constructed wetland have no obvious difference in removal of TN and nitrate nitrogen. The treatment efficiency of subsurface constructed wetlands is lower than that of surface-flow constructed wetlands. The removal rates of TN and nitrate nitrogen in surface-flow constructed wetland with cattail are 84.33% and 76.32% respectively, which is better than those in surface-flow constructed wetland with reed. Four kinds of wetlands have the COD removal rate of 30% to 65% without obvious difference. The constructed wetlands have an obvious purification for micro-polluted raw water from Yellow River, the effluent can satisfy the water quality standard for the city water supply source.