强化自净型水景湿地系统的构建及水质修复效果

Construction of Strengthened Self-cleaning Waterscape Wetland System and Its Purification Effect

针对保持水景水质的实际需求,设计和构建了包括水景观区、挺水植物区、生态净化区的强化自净型水景湿地中试系统,并研究了该系统的水质污染过程与水质调控效果。结果显示,当生态净化系统停运时水景湿地的水质迅速恶化,停运6 d后COD、TN、TP分别升至99、0.13、2.60 mg/L;系统重新运行后能达到较好的水质修复效果,水景水体中的COD、TP、TN和藻类生物量较快下降,运行18 d后COD、TN、TP和叶绿素a分别控制在50 mg/L、0.3 mg/L、0.036 mg/L和12μg/L以下。这表明生态净化系统能够迅速改善并维持水景湿地水质。

A pilot-scale strengthened self-cleaning waterscape wetland system was designed, con- structed and tested. The system included a waterscape area, an emergent aquatic plant area and an ecological cleaning area. The operation of the ecological cleaning system and its effect on water quality were studied. The results showed that the water quality deteriorated rapidly after the ecological cleaning system was shut down. The effluent concentrations of COD, TP and TN increased to 99 rag/L, 0.13 mg/L and 2.60 mg/L respectively after 6 days of shutdown. The water quality was restored once the ecological cleaning system was back in operation. COD, TP, TN and chlorophyll-a concentrations became less than 50 mg/L, 0.3 mg/L, 0. 036 mg/L and 12 ug/L respectively after 18 days of restarting. These results in- dicated that the ecological cleaning system could be used to protect the waterscape wetland.