高水力负荷人工湿地处理富营养化湖水

Constructed Wetland at High Hydraulic Loading for Eutrophic Lake Water Treatment

采用人工湿地处理星云湖富营养化水(1000m3/d),共筛选出60多种植物,并将水力负荷提高到1m3/(m2·d)。连续32个月的运行结果表明,高水力负荷人工湿地对非离子氨、叶绿素a和蓝藻的平均去除率分别达到90%以上,对TP的去除率达到68.83%,对BOD5、NH3-N、TN也有很好的去除效果,可将地表IV类水质处理为II类水质。此外,还分析了不同进水pH值、DO值、季节变化和不同运行时期对各类污染物的去除规律。

Constructed wetland was used to treat the eutrophic Xingyun Lake water (1 000 m^3/d), and more than 60 vegetables were selected and the hydraulic loading was raised to 1 m^3/(m^2·d). After continuous operation for 32 months, it was showed that the constructed wetland at high hydraulic loading has removal rate of over 90% respectively for ammonia, chlorophyll a and blue algae, and TP removal rate comes up to 68.83%. It is also efficient in removing BOD_5, NH_3-N, and TN, and the surface water quality can be upgraded from IV-class to II-class. Furthermore, analysis was made on the removal of all kinds of pollutant under the conditions of various pH and DO values in influent, and different seasons and operation periods.