生物绳-湿地植物复合人工湿地深度净化微污染水体的试验

High Purification of Micro-polluted Water in Compound Artificial Wetland with Bio-cord and Wetland Plant

采用新型生物绳填料和风眼莲组成的复合折流式人工湿地对罗时江微污染河水进行深度净化处理试验,以提高出水水质,并在水力停留时间为24 h的条件下研究该人工湿地对化学需氧量(chemical oxygen demand,COD_(Mn)、总氮(total nitrogen,TN)、NH_4^+-N和总磷(total phosphorus,TP)的处理效果.结果表明,有生物绳和凤眼莲的装置A和仅有生物绳的装置B的人工湿地系统对COD_Mn的平均去除率分别为24.89%和22.02%;对TN的平均去除率分别为40.80%和40.73%;对NH_4^+-N的平均去除率分别为73.82%和69.42%;对TP的平均去除率分别为47.83%和39.76%.罗时江河水原为V^IV类水质,净化处理后的出水基本能达到《地表水环境质量标准》(GB 3838—2002)Ⅲ~Ⅱ类水质标准.

A compound baffle artificial wetland system consisting of new bio-cord paddings and Eichhornia crassipes used hydraulic retention time for 24 hours to highly purify micro-polluted water so that the output of water are improved. The average removal rate of chemical oxygen demand （CODMn） was 24.89% and 22.02% respectively in device A filled with bio-cord and Eichhornia crassipes and in device B only with bio-cord. Besides, the average removal rate of total nitrogen （TN） was 40.80% and 40.73%. For NH＋4-N, it was 73.82% and 69.42%, and total phosphorus （TP） was 47.83% and 39.76%. The output water quality in Luoshi River can be raised from the original class VIV to class ⅢⅡ of the quality standard for surface water environment （GB 3838—2002） after purification.