表面流人工湿地改善城市河道水质的工程试验

Engineering and Experiment on Urban River Water Quality Improving by Surface Flow Constructed Wetland

为了探究表面流人工湿地改善河道水质的效果,在人工湿地建成后对湿地及河道进行9个月的水质监测,分析了湿地的长期处理效果和导致水质波动的环境因素。结果显示:TP、氨氮、COD相应去除率达到45.6%,60.4%,23.7%,治理后河道由轻度黑臭达到V类水标准。出水总磷受温度影响不大,夏季气温较高时,湿地出水COD和氨氮浓度较低;降雨对河道水质影响显著,24 h降雨量小于25 mm的降雨会大幅提高河水污染物浓度,50 mm以上大雨对河水水质影响不明显。该工程试验表明表面流人工湿地可以有效降低河道中污染物浓度,消除黑臭水体,恢复河流生态系统。

In order to explore the effect of surface flow artificial wetland to purify river water,the water quality of wetland and river was detected for 9 months.The performance of wetland treatment and the factors affecting the operation of wetland were analyzed.The result shows that the removal rate of TP,TN and COD were 45.6%,60.4%and 23.7%,respectively.The water quality of the river after treatment meet the"Surface Water Environmental Quality Standard"class V standard from malodorous black water.The TP of effluent is not significantly affected by temperature.When the temperature is high in summer,the COD and NH4+-N of effluent is lower.Rainfall has a significant impact on river water quality.Rainfall less than 25 mm/24 h will significantly increase the concentration of pollutants,while heavy rain with more than 50 mm/24 h has no obvious impact on river water quality.The results show that the project can effectively remove pollutants from river,eliminate malodorous black phenomenon and restore river ecosystems.