对初期雨水径流弃流问题的探讨  

Discussion on Split-flow of First Flush Runoff

作　　者：郑毅[1,2] 曹建山 刘宝山[1] 孙井梅[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津金融城开发有限公司,天津300040 [3]天津天传市政工程有限公司,天津300074

出　　处：《中国给水排水》2009年第19期106-108,共3页China Water & Wastewater

基　　金：天津科技支撑重点项目(08ZCGYSF00100);国家水体污染控制与治理科技重大专项(2008ZX07314-004)

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。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.

关 键 词：初期雨水径流 弃流 混凝 预沉 

分 类 号：TU991.2[建筑科学—市政工程]