表流人工湿地改善玉清湖入库水水质的研究

Surface-flow Constructed Wetland for Improvement of Water Quality into Yuqing Lake Reservoir

在济南玉清湖水库的进水口附近构建了芦苇床表流人工湿地和蒲草床表流人工湿地,考察了对入库微污染黄河原水水质的改善效果。结果表明:两个人工湿地对COD的平均去除率均低于10%,对总氮的平均去除率分别为56.17%和69.44%,对总磷的去除效果极不稳定。随着气温的降低,两个人工湿地的处理效果逐渐变差。与夏季相比,冬季对总氮的去除率降低了约50%。蒲草床表流人工湿地对总氮和硝态氮的去除效果明显好于芦苇床表流人工湿地,这与蒲草长势好、种植密度大有关。

Surface-flow constructed wetlands with reed and cattail respectively were constructed at the entrance of Yuqing Lake Reservoir. The effect improving quaiity of the micro-polluted Yellow River raw water into the reservoir was investigated. The results indicate that the average removal rates of COD in the two different wetlands are both below 10% , and TN removal rates are 56.17% and 69.44% respectively. The removal efficiencies of TP are unstable. With the decrease of the temperature, the removal efficiency in the two wetlands decreases obviously. The removal rate of TN in winter decreases by 50% compared with that in summer. The surface-flow constructed wetland with cattail has better removal efficiency of TN and nitrate nitrogen than surface-flow constructed wetland with reed, which owes to good growth and high density of cattail.