城市雨水径流下垫面基质优化与吸附性能

Optimization and Adsorbability of Underlying Materials for Treatment of Urban Water Runoff

针对海绵城市建设中城市雨水径流下垫面填充基质功能单一问题,选取蛭石、煤渣、陶粒、火山石4种基质和基质A、基质B两种混合基质(基质A为m(蛭石)∶m(沸石)∶m(煤渣)=3∶3∶4,基质B为m(蛭石)∶m(沸石)∶m(陶粒)=3∶3∶4)进行吸附性能研究,发现6种填料均能较好的用Langmuire和Freundlich模型等温吸附式描述.综合分析得出混合基质对氨氮和磷的吸附性能强于单一基质,将混合基质引入海绵城市雨水渗滤系统可以提高雨水径流污染物的去除率,有利于城市雨水径流阻控.

Aiming at the problem of the single function of the filling surface of the urban rainwater runoff under the sponge city construction,4 materials,vermiculite,cinder,ceramsite,and volcano stone,and mix substrate A（m（vermiculite）∶ m（zeolite）∶ m（cinder）= 3 ∶ 3 ∶ 4）and B（m（vermiculite）∶m（zeolite）∶m（ceramsite）=3∶3∶4）are selected to study the adsorption performance.It is found that the isothermal adsorption performance of all these six fillers could be well described by Langmuire and Freundlich model.The results show that the adsorption performance of mixed substrates to ammonia nitrogen and phosphorus is better than that of single matrix.The introduction of mixed substrates into sponge city rainwater filtration system can improve the removal rate of rainwater runoff pollutants,which is beneficial to urban rainwater runoff control.