城市小区雨水径流投加细砂强化混凝沉淀优化条件研究

Research on optimal condition of strengthened coagulation and sedimentation with micro-sand of runoff from urban residential area

城市小区雨水径流水质的污染主要为有机污染和悬浮固体污染,且污染物的可生化性差,采用投加混凝剂同时加细砂的强化混凝沉淀实验,确定了小区径流混凝沉淀处理最适宜的混凝剂种类、最佳的混凝反应运行条件及最优的药剂和细砂投加量。实验表明:在混凝沉淀过程中投加细砂,不仅能提高混凝沉淀效果,而且能提高沉淀速度。小区径流强化混凝沉淀的浊度去除率达99.7%,COD去除率达92.6%,处理水的浊度1.66 NTU,COD 35mg/L两主要指标均优于杂用水水质标准。因此,投加细料的混凝沉淀是小区雨水径流处理利用及污染控制最简便易行且有效的处理方法。

The main pollutants of the runoff from urban residential area are organic pollutants and suspended solids.The biodegradable ability of organic pollutants is low.The style of coagulants,the best reacting condition,the quantities of medicament and micro-sands are confirmed by the experiment of the strengthened coagulation and sedimentation with micro-sands.The experiment shows that the effect and velocity of the coagulation and sedimentation with micro-sand materials can be increased and the removal rate of turbidity is 99.7%,the removal rate of COD is 92.6%.The two main indexes turbidity 1.66NTU,COD 35mg/L are superior than the quality standard of the miscellaneously using water.So the coagulation and sedimentation with micro-size materials is a simple,convenient and effective method of the treatment utilization and pollution control of the runoff from urban residential area.