潜流人工湿地改善官厅水库水质试验研究

为确定利用人工湿地改善官厅水库水质工程所需的设计参数,在官厅水库岸边建立了人工湿地,开展了潜流人工湿地系统处理官厅水库水的试验研究.试验表明,在水力负荷率为0.15～0.45m/d时,夏季COD_Mn和NH₄⁺-N的去除率分别为50%和70%;冬季,分别可达到15%和50%,去除率随水力负荷率的提高和水温的下降而降低.由于渗漏和蒸发及植物蒸腾作用,系统的出水量为进水量的60%.研究结果表明,潜流人工湿地系统对微污染地表水有较好的净化效果,该系统在冬季低温条件下仍可以正常运行.

Experimental studies on subsurface flow constructed wetland for water quality improvement in Guanting Reservoir

To affirm the design parameters necessary for water quality improvement project of Guanting Reservoir, using constructed wetland, the wetland was built at the reservoir edge to study experimentally the subsurface flow wetland system for water treatment of the reservoir. The experiment indicated that the removal rates of CODMn and NH4+-N were 50% and 70%, in summer and 15% and 50% in winter respectively, as the hydraulic loading rate was 0.15~0.45m/d. The removal rates lowered with the increase of hydraulic loading rate and the lowering of water temperature. The outflow of water in the system was 60% of water inflow, due to leakage, evaporation and plant transpiration. The study results indicated that the subsurface flow constructed wetland system had better purification effect on the micro-polluted surface water. The system could still operate normally at low temperature in winter.