潜流式人工湿地冬季运行的强化措施研究

Study on Enhanced Measures for Operation of Subsurface Flow Constructed Wetlands in Winter

采用收割的湿地植物对潜流式人工湿地进行覆盖保温,考察了这种保温方法对潜流式人工湿地冬季运行时除污效果的影响。结果表明,在冬季采用这种保温方法可以提高潜流式人工湿地对污染物的去除效果,覆盖湿地对TP、NH4+-N和TN的平均去除率分别比对照湿地(未进行覆盖保温)提高了15.5%、9.7%和5.0%;覆盖湿地的表层冻土层厚度明显小于对照湿地的,这种保温方法可以避免或减轻冬季湿地填料的冻结。

The subsurface flow constructed wetland was covered with the harvested wetland vegetation for the sake of heat preservation. The influence of the heat preservation technology on the pollutant removal effect of subsurface flow constructed wetland in winter was studied. The results show that the pollutant removal effect can be improved by covering the wetland with harvested vegetation in winter. The average removal rates of TP, NH4^＋ - N and TN in the covered wetland are higher 15.5% , 9.7% and 5.0% respectively than that in the control wetland. The frozen earth surface thickness of the covered wetland is much less than that of the control wetland, which indicates that this technology can avoid or reduce the frozen media in winter.