再生水管网余氯衰减规律及影响因素研究  

Decay Law and Influential Factors for Residual Chlorine in Reclaimed Water Network

作　　者：杨海涛[1] 田一梅[1] 刘骋[1] 刘鸿鹄[2] 李倩[2] 焦健[2] 李晋[2] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津中水有限公司,天津300221

出　　处：《中国给水排水》2016年第15期85-90,共6页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-005);高等学校博士学科点专项科研基金资助项目(20130032110032)

摘　　要：针对管网中再生水的余氯衰减动力学及其影响因素展开研究,通过拟合大量试验数据,发现传统的一级模型用于再生水余氯衰减并不准确,于是提出了分阶段的余氯衰减模型。再生水水质影响试验结果表明,初始氯浓度、温度、TOC、亚硝酸盐氮浓度与水体余氯衰减系数呈正相关关系,而氨氮浓度与水体余氯衰减系数呈负相关关系;再生水水体中余氯衰减系数与TOC浓度呈指数函数的关系。模拟管网试验结果表明,在新铺设的管网中余氯在水体中的衰减速率明显大于在管壁处的衰减速率;流速和管材对管网再生水中余氯的衰减有重要影响;不带内衬的铸铁管中再生水的余氯衰减系数比带水泥砂浆内衬的铸铁管和PE管中再生水的余氯衰减系数约大一倍。Residual chlorine decay kinetics and its influential factors of reclaimed water in pipes were researched. Based on a great deal of laboratory data, it was found that traditional first-order chlorine decay model was inaccurate, and the residual chlorine decay model in stages was proposed. The results of reclaimed water experiments showed that residual chlorine decay coefficient of reclaimed water had posi- tive correlation with initial concentration of chlorine, temperature, TOC and nitrite concentrations, while it had negative correlation with ammonia concentration. There was an exponential relation between the re- sidual chlorine decay coefficient of the first-order reaction and the concentration of TOC. The results of pipe experiments showed that residual chlorine decay rate in reclaimed water was larger than the decay on pipe wall obviously. Water flow rate and the material of pipes had important effects on the residual chlo- rine decay. The chlorine decay coefficient in cast iron pipes without cement mortar was about twice larger than that in cast iron pipes with cement mortar and PE pipes.

关 键 词：再生水 余氯衰减 分段模型 影响因素 

分 类 号：X703[环境科学与工程—环境工程]