不同基质复合人工湿地对高污染河水的净化

摘要

采用表流+砾石潜流和表流+炉渣潜流2组复合人工湿地处理高污染河水，对2组复合人工湿地的净化效果进行了对比研究，考察了基质类型对复合系统中二级潜流湿地的影响作用，并探究了2种基质的除磷能力。研究结果表明：两组复合湿地对SS、COD、BOD5的去除主要在一级表流湿地中完成，避免了在二级潜流湿地中堵塞；炉渣复合湿地更利于硝化的进行和对磷的去除。炉渣对磷的去除率和抗负荷能力均高于砾石。%Two groups of constructed wetland systems,including surface flow+gravel undercurrent and surface flow+slag undercurrent,have been used for treating highly polluted river water. The purification results of the two systems are compared. The effects of the types of substrates on the two stages of the undercurrent wetlands in the complex systems are investigated and the dephosphorization capacities of the two kinds of substrates are explored. The results of the research show that the removal of SS,COD,BOD5 are mainly accomplished in the first stage of surface flow constructed wetland,avoiding blocking in the second stage undercurrent wetland. The slag complex wetland is more beneficial to the accomplishment of nitrification and the removal of phosphorus. Slag has better capacities for phos-phorus removing rate and load resisting than gravels.