三级渗滤系统控制农业径流污染的试验

为明确渗滤系统在控制农业径流污染中的拦截削减性能,在重庆市万州高峰镇鹿山河旁建立三级渗滤系统,开展了农业径流污染净化效果的试验。结果显示,系统对SS、NH4+-N、TN和TP具有较好的去除效果,平均去除率可分别达到80%、78%、37%及48%。污染物浓度沿系统各级逐渐降低,TN、NH4+-N的去除率沿程逐渐趋缓,TP、SS去除率沿程没有明显减缓的趋势。系统第一级对氮的去除以颗粒态为主,第二、三级以溶解态为主;系统第一、二级对磷的去除以颗粒态为主,第三级对颗粒态磷与溶解态磷的去除比例相近。系统第一级对各污染物的去除效率最高,硝化作用较强;第二级TN、NH4+-N的去除率与第一级相比依然较高;第三级NH4+-N、TN、TP去除率较低,但SS的去除效率与第二级相当。

Experiments on controlling agricultural runoff pollution by three-stage filtration system

A three-stage filtration system,which locates next to Lushan River in Gaofeng Town of Chongqing,is built to make clear its effects on controlling the runoff pollution.The system is adaptive to variation of inflow quality and quantity.The average removal rates of SS,NH+4-N,TN and TP are 80%,78%,37% and 48%,respectively.The concentrations of various pollutants decrease gradually along the way with the increase of filtration system stages.The removal rates of TN and NH+4-N increase steadily with the increase o...