复合填料生物渗滤系统处理城市雨水径流的研究

Treatment of Urban Runoff Pollutants by a Multilayer Biofiltration System

为有效控制无锡市道路雨水径流面源污染,根据当地径流污染的特点,设计了能去除多种道路径流污染物的复合填料生物渗滤系统,进行污染雨水净化效果的试验研究.结果表明,系统对道路雨水中的悬浮性颗粒物(SS)、耗氧有机污染物(COD)和氮磷污染物均具有明显的去除效果;所有类型的复合填料生物渗滤系统对于SS均具有较高的去除率,能够达到90%以上;以活性炭填料为主的渗滤系统(GAC)对于COD和磷类污染物的去除效果相对较优,以沸石填料为主的渗滤系统(ZFM)对氮类污染物的去除效果相对较优.木屑在系统中的添加能够有效提高系统对氮类污染物的去除率;在系统中混合分散放置木屑的装填方式相较于集中分层的装置方式能够减少木屑溶出物的释放,可使系统达到更高的COD和氮磷污染物的去除效率.

In order to control the non-point source pollution from road runoff in Wuxi City effectively,a multilayer biofiltration system was designed to remove a variety of pollutants according to the characteristics of road runoff in Wuxi,and the experimental research was carried out to study the effect on rainwater pollution purification.The results show that the system has a good performance on removing suspended solids( SS),organic pollutant( COD),nitrogen and phosphorus: all types of multilayer biofiltration systems have a high removal rate for SS,which can reach 90%.The system with activated carbon( GAC) has higher removal rates for COD and phosphorus.The system with zeolite( ZFM) has a relatively better removal efficiency for nitrogen.The addition of wood chips in the system can significantly improve the system efficiency for nitrogen removal.Between the two configurations of layered and distributed wood chips,configurations of distributed wood chips reach higher COD,phosphorus and nitrogen pollutants removal efficiencies since they can reduce the release of wood chips dissolution.