人工湿地中基质与植物对污染物去除效率的影响

针对太湖五里湖富营养化水体，采用中试规模的人工湿地现场实验开展了不同基质、不同植物的污染物去除效果研究。基质采用炉渣和沸石2种，在一个湿地池种植单一植物茭白，另一个湿地池种植鸢尾＋菖蒲混合植物，同时构建了无植物的对照组湿地。研究表明：（1）在运行初期，沸石和炉渣2种基质对TN、TP的去除率差异为12.5%和12.6%，吸附饱和后，2种基质对TN和TP的去除率差异缩小为3.2%和6.1%，从长期运行来看，炉渣和沸石2种基质在人工湿地中的去除效率差异将减小；（2）茭白单一植物湿地对污染物的去除率与鸢尾＋菖蒲混合植物湿地对污染物的去除率两者之间差异不大；（3）人工湿地种植植物后对TN、TP的去除率比无植物状态时分别高出13.6%和19.5%，植物在人工湿地中对污染物的去除发挥了重要作用；（4）在本试验条件下，茭白吸收所去除的氮数量为湿地氮总去除量的8.95%，茭白吸收去除磷的数量为湿地磷总去除量的20.16%，在人工湿地中，茭白吸收对磷的去除效率比对氮的去除效率高。

Effects of substrates and plants on pollution removal of constructed wetlands

The pilot-scale constructed wetlands with different substrates and plants were built to treat eutrophic Wuli Lake.The slag and zeolite were selected as substrates.Zizania caduciflora was planted in one wetland,and Iris pseudacorus & Acorus calamus was planted in another.Meanwhile,there is a wetland without any plants growing as a comparison.The results show that the differences of the removal rates for the TN between slag substrates and zeolite substrates is 12.5% in the initial stages,and it is 12.6% for T...