潮汐流-水平潜流组合人工湿地的污水处理效果

利用室内潮汐流和水平潜流人工湿地装置,构建潮汐流-水平潜流(TF-HF)和水平潜流-潮汐流(HF-TF)2种不同组合的人工湿地系统,探讨不同组合方式的水平潜流和潮汐流人工湿地复合系统对污染物的去除效果。研究结果表明:在进水条件相同、潮汐流人工湿地淹没排空比均为12h∶12h、水平潜流人工湿地水力停留时间(HRT)均为4d、系统回流比均为1∶1条件下,潮汐流-水平潜流人工湿地系统和水平潜流-潮汐流人工湿地系统对总有机碳(TOC)的去除率分别为90.2%和91.3%,无明显差异;对NH4+-N的平均去除率分别为19.5%和39.2%,总氮(TN)的平均去除率分别为10.3%和30.5%,水平潜流-潮汐流人工湿地系统表现出较好的运行效果。

Purification capacities of hybrid tidal flow and horizontal subsurface flow constructed wetlands systems

For the investigation of purification capacity of hybrid constructed wetlands,the tidal flow-horizontal flow(TF-HF) system and horizontal flow-tidal flow(HF-TF) system were constructed on laboratorial scale.At the flood drain ratio of 12 h∶12 h in tidal wetlands,hydraulic retention time of 4 d in horizontal flow wetlands,and recirculation of 1∶1,the average total organic carbon(TOC) removal rates of the two systems were 90.2% and 91.3%,but the average removal rates of NH+4-N were 19.5% and 39.2%,respectively.The average removal rates of total nitrogen(TN) were 10.3% for TF-HF and 30.5% for HF-TF.Results indicated that the purification capacity of HF-TF system was much higher than that of the TF-HF system.The findings of this work may provide a theoretical basis for the application of combined tidal flow and horizontal subsurface flow constructed wetlands in practice.