进水条件对不同类型人工湿地处理效果的对比分析

Comparative Analysis of the Effects of Influent Conditions on Different Types of Constructed Wetlands

在研究2种类型湿地最佳运行参数的基础上,对不同进水条件下2种类型人工湿地处理污染物的效果进行对比分析,同时,在微生物层面对试验结果进行初步验证。结果表明:本条件下潮汐流人工湿地的最佳淹没时间为36 h,最佳闲置时间为6 h,最佳运行周期为42 h;潜流湿地最佳水力负荷为0.4 m^3/(m^2·d);随着C/N逐渐上升,2种类型的湿地对NO-3-N和TN的处理效果均上升,NH+4-N的变化较小;随着c(NO-3-N)/c(TN)逐渐上升,潮汐流湿地中NH+4-N的变化不明显,潜流湿地的NH+4-N去除率降低,2种类型的湿地对NO-3-N和TN处理效果均下降,但潜流湿地均好于潮汐流湿地;潮汐流湿地的基质微生物量、酶活性和硝化强度均好于潜流湿地,反硝化强度低于潜流湿地。

Based on the study of the optimal operating parameters of two types of wetlands,the effects of two types of constructed wetlands on contaminants under different influent conditions were compared and analyzed.The experimental results were verified in the microbial layer.Results showed that the optimal submersion time of tidal flow constructed wetland was 36 h,the optimal idle time was 6 h,the optimal operation period was 42 h,and the optimal hydraulic load of subsurface wetland was 0.4 m^3/(m^2·d).With the increase of C/N ratio,treatment efficiency of both types of wetlands on nitrate and total nitrogen increased.The change of ammonia nitrogen was small.With c(NO-3-N)/c(TN)gradually rising,the change of ammonia nitrogen in tidal wetland was not large.Treatment efficiency of nitrate nitrogen and total nitrogen decreased in two types of wetlands,but subsurface wetland was better than tidal flow wetland.Microbial biomass,enzyme activity and nitrification intensity of tidal flow wetland were better than the subsurface wetland and the denitrification intensity is lower than that of the subsurface flow wetland.