潮汐流人工湿地净化城市河水中试研究

Pilot Study on Purification of Urban River Water by Using Tidal Flow Constructed Wetland

在沈阳市仙女湖公园内建设人工湿地中试系统净化城市河流卫工河河水,对比了潮汐流和垂直潜流人工湿地中试系统对河水的净化效果,并优化了潮汐流人工湿地的运行条件。结果表明,潮汐流人工湿地对CODCr、NH+4-N、TN和TP浓度分别为60.45～93.73、2.33～4.79、4.61～8.97和0.54～0.80mg/L的河水的净化效率分别为45.96%、35.76%、30.16%、33.80%,比垂直潜流人工湿地的去除率分别提高了10.23%、19.89%、12.76%、22.12%;潮汐流人工湿地中试系统按照"进水-反应5h-排水-闲置3h"运行,其出水水质指标达到GB3838—2002《地表水环境质量标准》的Ⅴ类水质要求,中试系统上层对TN去除效果最好,中层对CODCr和NH+4-N去除效果最好,下层对TP去除效果最好。

The pilot-scale tidal flow and vertical subsurface flow constructed wetland systems were built up in Xiannfi-Lake Park of Shenyang City for urban river, Weigong River, water purification, their water purifying efficiencies were compared, and the performing conditions of the tidal flow wetland were optimized. The results showed that for the inflow river water with CODcr, NH4^＋ -N, TN and TP concentrations of 60.45-93.73, 2.33- 4.79, 4.61-8.97 and 0.54-0.80 mg/L, the purifying efficiencies of tidal flow constructed wetland were 45.96%, 35.76%, 30. 16% and 33.80%, which were 10.23%, 19.89%, 12.76%, 22. 12% higher than those of subsurface flow constructed wetland, respectively. If the pilot-scale tidal flow constructed wetland system was performed following the conditions of ＂inflow - reacting for 5 h - outflow - being idle for 3 h＂, the effluent water quality could meet the fifth grade of the SuoCace Water Quality Standards. The highest removal efficiencies of CODc, and NH4^＋ -N were in the middle layer of the tidal flow constructed wetland, while the highest removal efficiencies of TN and TP were in the top and bottom layers, respectively.