折流式表面流湿地对水质净化效果的影响

目的]研究折流式表面流湿地对水质净化效果的影响,为受污染河流的生态修复提供参考。方法]在贾鲁河畔建成总面积为7400m2的条带折流式表面流湿地系统,并测定水中DO、TN、TP、NH4＋-N、CODCr、SS、SD等指标含量。结果]折流式表面流湿地能显著改善出水水质,提高透明度和溶解氧含量,降低SS含量;TN去除率夏季保持在73%以上,初冬TN去除率降到23%;TP去除率受温度影响不大,夏季保持在77%以上,秋冬仍在保持在69%以上;NH4＋-N去除率夏季保持在83%以上,秋冬季略有下降,但仍保持在75%以上;对CODCr的去除率在14%～50%。结论]折流条带式表面流湿地技术有效地提高了表面流湿地净化效果,是可行的生态恢复手段。

The Effect of Baffled Surface Flow Wetlands on Water Purification

Objective] The effect of baffled surface flow wetlands on water purification was studied in order to provide a reference for the ecological restoration of polluted river.Method] Contents of some indexes like DO,TN,TP,NH＋4-N,CODCr,SS,SD,etc.were determined in the band baffled surface flow wetlands with total area of 7 400 m2 at JiaLu riverside.Result] Baffled surface flow wetlands could improve the effluent quality significantly,could enhance transparency and dissolved oxygen content and also could decrease SS content.The removal rate of TN was kept at more than 73% in summer and decreased to 23% in early winter;The removal rate of TP was little influenced by temperature,and it was kept at more than 77% in summer and still kept at more than 69% in autumn and winter;The removal rate of NH＋4-N was kept at more than 83% in summer and decreased slightly in autumn and winter,but still kept at more than 75%;The removal rate of CODCr ranged from 14% to 50%.Conclusion] Baffled surface flow wetlands could effectively improve the purification effect of surface flow wetlands,which is a feasible way for ecological restoration.