【摘要】 采用混凝/沉淀工艺处理某高校校园的路面初期雨水径流,并对其弃流问题进行了探讨。结果表明,最佳混凝剂为聚合氯化铝(PAC),其最佳投量为20～35 mg/L;混凝/沉淀工艺对初期雨水的浊度、COD的去除率较高,均可达90%以上;不预沉的初期雨水径流的混凝/沉淀效果明显优于预沉后的;综合考虑初期雨水弃流装置的建设、运行、维护、管理等因素,建议校园或类似区域宜选择初期雨水不弃流,将收集到的全部雨水经混凝/沉淀处理后再利用。更多还原

【Abstract】 The coagulation/sedimentation process was applied to treat road first flush runoff in a campus,and the split-flow was discussed.The results show that the best coagulant is polyaluminium chloride(PAC),and its optimal dosage is 20 to 35 mg/L.The removal rates of turbidity and COD from the first flush by coagulation/sedimentation process are high,both reaching more than 90%.The coagulation/sedimentation efficiency of the first flush without pre-sedimentation is obviously better than that with pre-sedimentation.Considering the factors of construction,operation,maintenance and management of first flush removal devices,the initial split-flow in campus or similar district is not suggested.All rainwater runoff collected can be reused after the coagulation/sedimentation treatment.更多还原