管材和水力条件对三卤甲烷形成的影响

袁一星^1,2, 钟丹^1,2, 吴晨光^1,2, 吴艳³, 邱微^1,2

1.哈尔滨工业大学城市水资源与水环境国家重点实验室;2.哈尔滨工业大学市政环境工程学院;3.宁波市城建设计研究院有限公司



摘要:

针对管材和水力条件对氯消毒副产物(Disinfection By-Products,DBPs)产生过程的影响,研究了管材和水力条件对供水管网中典型的消毒副产物——三卤甲烷(Trihalomethanes,THMs)形成的影响情况,其中,管材对THMs生成的影响研究采用静态管段反应器来完成,水力条件对THMs生成的影响研究采用供水管网动态模拟装置来完成.静态试验的研究结果表明:在不同管材中,余氯衰减速率排序为球墨铸铁>PVC>不锈钢,而THMs的生成量排序为:PVC管>球墨铸铁管>不锈钢管.供水管网动态模拟试验结果表明:THMs的生成量与流速成正比,但相对于余氯的衰减速度,THMs的增加并不显著;当停留时间和流速同时对THMs的生成量产生影响时,THMs的变化取决于二者影响程度的大小;管径与THMs的生成量成正比;余氯、管材、流速和停留时间都是THMs形成的重要影响因素.

关键词:  三卤甲烷  管材  水力条件

DOI：10.11918/j.issn.0367-6234.2011.10.005

分类号:TU991.21

基金项目:国家自然科学基金资助项目(青年)(51108123);城市水资源与水环境国家重点实验室(哈尔滨工业大学)自主课题(2010TS02);中央高校基本科研业务费专项资金资助项目(HIT.NSRIF.201191);水体污染控制与治理科技重大专项(2009ZX07424-001)



Effects of pipe materials and hydraulic conditions on the formation of trihalomethanes

YUAN Yi-xing^1,2, ZHONG Dan^1,2, WU Chen-guang^1,2, WU Yan³, QIU Wei^1,2

1.State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,150090 Harbin,China;2.School of Municipal and Environmental Engineering,Harbin Institute of Technology,150090 Harbin,China;3.Ningbo Urban Construction Design & Research Institute Co.,Ltd,315012 Ningbo,Zhejiang,China)

Abstract:

The effects of different pipe materials and hydraulic conditions on the formation of trihalomethanes(THMs) were investigated.Pipe section reactor was used for the research of pipe materials and dynamic simulation equipment of water distribution network was used for the research of hydraulic conditions.The results of pipe section reactor showed that the ranking of chlorine decay velocity in different pipe materials was ductile cast iron>PVC>stainless steel,while the ranking of THMs concentration was PVC>ductile cast iron>stainless steel.The results of dynamic simulation showed that a higher flow velocity of water caused higher THMs concentration,but it was not distinct compared with the decay of chlorine.When retention time and flow velocity affected the formation of THMs simultaneously,THMs concentration was dependent on the effect degree of the two factors.THMs concentration increased as pipe diameter was increased.Chlorine residual,pipe materials,flow velocity and retention time are all important effects for the THMs formation.

Key words:  trihalomethanes  pipe material  hydraulic condition