串联植物塘净化巢湖湖水的中试研究及启示

Enlightenment of Pilot Test of Water Purification in Chaohu Lake by Series-operation Plant Pond

利用串联式水生植物塘净化巢湖水,考察中试阶段对氮磷的去除效果及富营养化湖水流经各级植物塘时其他水质指标的变化情况。结果表明,总氮和总磷的去除率分别为42.1%和24.8%,COD的去除率为36.7%,出水温度下降0.32℃;黑藻的存活率最低,但其对有机物和营养盐的去除效果均好于其他两种水生植物,值得做进一步研究。并结合中试运行中出现的问题和巢湖环境特征,指出巢湖目前环境较适于挺水植物的栽种和生长,认为在对巢湖进行生态恢复或生物修复时可考虑从栽种挺水植物入手。

Chaohu Lake water was purified by series -operation of aquatic-plant pond. Removal efficiency of nitrogen and phosphorus and other water quality index changes after the flowing of eutrophication water in plant ponds were investigated in pilot test. The removal rates of total phosphorus and total nitrogen was 24.8 % and 42.1%, respectively. COD removal rate was 36.7 % and effluent water temperature dropped 0.32 ℃. The survival percentage of Hydrilla verticillata was the lowest. But its removal effects on organic matter and the nutrition salt were better than the other two plants, which was worth of doing further studies. Finally, according to the problems in pilot test and environmental characters in Chaohu Lake, it was thought that emerged plant was more suitable to be planted in the current environment. It was proposed that during ecological reconstruction and biological repair in Chaohu Lake, we could consider to start with planting emerged plants.