人工湿地对西湖非点源污染源的治理研究

Study on the treatment of the non-point source pollution in Westlake area through the artificial wetland

运用种植菩提子 (Coixlacryma jobiLinn .)和美人蕉 (CannaindicaLinn .)的下行 上行流人工湿地系统处理西湖非点源污染源 ,研究湿地系统中植物的生长和湿地对污水的净化效果 .结果表明 :两种植物在湿地中都有良好的长势 ,菩提子在 79月处于快速生长期 ,10 11月生长减缓 ;美人蕉前期生长缓慢 ,后期加快 .构建的人工湿地充氧能力较强 ,对总氮的去除率维持在 73%以上 ,总磷的去除率为 49% 71% ,出水水质总体达到国家Ⅱ、Ⅲ类地面水标准 .因此该人工湿地可用于中等程度污水的治理 ,菩提子和美人蕉是本地区人工湿地较为适宜的植物种类 .

Using the upflow\|downflow artificial wetland system with \%Coix lacryma\|jobi\% Linn. and \%Canna indica\% Linn., the growth of the plants and the purification efficiency of the system were studied. The results showed that the two species of plants could develop well in the artificial wetland. \%Coix lacryma\|jobi\% Linn. grew rapidly from July to September and in October and November it grew slowly. While the growth of \%Canna indica\% Linn. showed the different tendency. It grew slowly in the early days and grew rapidly in the later period. They could supply enough oxygen and the removal rate of TN were more than 73% and those of TP were between 49%~71%, so that the outflow of the wetland meet the grade Ⅱ and Ⅲ national criteria of surface water. It is proved that the artificial wetland system can be used to treat the non\|point source pollution with middle eutrophic level and \%Coix lacryma\|jobi\% Linn. and \%Canna indica\% Linn. are suitable for the wetland in Westlake area.\;