基于多目标评价的市政道路径流污染控制生物滞留设施填料优化

Optimization of bioretention facility media for municipal road runoff pollution control based on multi-objective evaluation

为优化面向市政道路径流污染控制的生物滞留设施填料,运用多目标评价方法对填料的渗透性能、污染物去除效果和经济成本进行综合评估。以我国华北地区的地理特征和市政道路径流污染特征为依据,开展生物滞留柱试验研究,得到填料优化配比为土壤、河沙、草炭土、给水厂污泥(含铝盐)、蛭石、沸石的质量比为30∶24∶6∶20∶10∶10,该填料组合能够维持较好的渗透性能,在污染物(SS、COD_(Cr)、TN、NH_(3)-N、TP)去除效果良好的同时,具有填料本地化和固废资源化的特点。

In order to optimize the bioretention facility media for municipal road runoff pollution control,a multi-objective evaluation method was employed to comprehensively evaluate the permeability performance,pollutant removal efficiency and economic cost of bioretention media.Based on the geographical conditions and municipal road runoff pollution characteristics in north China,a lab-based simulation experiment using bioretention columns was carried out.The results indicated that the optimized media was composed of natural soil,river sand,peat soil,water treatment residual(rich in aluminium salt),vermiculite and zeolite,with a mass ratio of 30∶24∶6∶20∶10∶10.The optimized media could maintain decent permeability and effectively remove runoff pollutants(SS,COD_(Cr),TN,NH_(3)-N,TP),and also had characteristics of the localization of media and the recycling of solid wastes.