景观植物潜流湿地对富营养化景观水的净化

研究了风车草、美人蕉两种植物人工湿地在不同月份对富营养化景观水的净化效果。分析了水力负荷、温度变化对污染物去除效果的影响,考察了两种植物人工湿地微生物的硝化/反硝化作用强度。结果表明:两种植物人工湿地对富营养化景观水中的污染物均有较好的净化效果,风车草湿地去除效果优于美人蕉湿地。污染物的去除效率随水力负荷的增加而降低;在最佳水力负荷为0.113m3/(m2.d)的条件下,出水TN、TP和CODCr的质量浓度分别在2、0.1和15mg/L以下;富营养化的控制因子磷的去除效率基本不受温度影响。风车草湿地硝化作用强度略高于美人蕉湿地,反硝化作用强度略低。

Effects of subsurface-flow constructed wetlands planted with macrophytes on purification of eutrophicated scenic water

The effects of constructed wetlands planted with cyperus alternifolius,canna edulis on the purifica-tion of eutrophicated scenic water in different seasons were studied.The influences of hydraulic loading,water temperature on the pollutants removal were analyzed,and the intensity of the microorganism nitrification and denitri-fication of the two wetlands were investigated.The results showed that,the constructed wetlands planted with two dif-ferent plants all had satisfied removal efficiency to eutrophicated scenic water and the constructed wetland planted with cyperus alternifolius had higher purification efficiency than that with canna edulis.The pollutants removal rates were reduced with the increase of hydraulic loading rate.Under the optimal hydraulic loading: 0.113 m3/(m2·d),the mass concentration of TN,TP and CODCr were under 2,0.1 and 15 mg/L respectively;the temperature had no significant effect on the removal rate of phosphorus.The intensity of nitrification in constructed wetlands planted with cyperus alternifolus was higher than that with canna edulis,but the intensity of denitrification was a little lower.