模块化人工湿地对景观水的净化作用

Purification Effect of Modular Constructed Wetland on Landscape Water

人工湿地作为新型生态修复技术对地表富营养化水体具备一定净化能力。为探究人工湿地对景观水体净化能力,本研究以大学校园内景观湖水为研究对象,采用模块化人工湿地模拟装置进行水质净化实验,通过对比不同水力负荷、水力驻留时间下化学需氧量(COD)、硝酸盐氮(NO3-N)、总磷(TP)的净化效果,探究人工模拟装置处理校园景观水体的最佳处理条件。结果表明:(1)在0.216~0.864 m3/d水力负荷条件下对COD、NO3-N、TP净化效果最佳的水力负荷分别为0.432 m3/d、0.216 m3/d和0.216 m3/d。(2)在12~72 h的水力驻留时间下,最佳水力驻留时间均为72 h。小试试验结果表明,人工湿地模拟装置对校园景观水净化的最佳水力负荷为0.216 m3/d,最佳水力驻留时间为72 h,COD、NO3-N、TP的去除率分别为52.06%、39.31%、39.44%。

As a new type of ecological restoration technology,constructed wetland has a certain ability to purify eutrophic surface water. In order to explore the ability of constructed wetlands to purify landscape water bodies,this study took the landscape lake water on the university campus as the research object,and used modular constructed wetland simulation devices to conduct water purification experiments. By comparing different hydraulic loads,chemical oxygen demand under different hydraulic residence time The purification effect of COD,nitrate nitrogen( NO3-N),and total phosphorus( TP),to explore the best treatment condition of the campus landscape water treated by artificial simulation device. The results show that:( 1) Under the hydraulic load conditions of 0. 216 ~ 0. 864 m3/d,the hydraulic loads with the best purification effects on COD,NO3-N and TP were 0. 432 m3/d,0. 216 m3/d and 0. 216 m3/d,respectively.( 2) The best hydraulic residence time is 72 h under the hydraulic residence time of 12 ~ 72 h. The test results show thatthe optimal hydraulic load of constructed wetland simulator for water purification of campus landscape is 0. 216 m3/d,the optimal hydraulic resident time is 72 h,and the removal rates of COD,NO3-N and TP are 52. 06%,39. 31%and 39. 44%,respectively.