title: Second-order chlorine decay and trihalomethanes formation in a pilot-scale water distribution systems.
abstract: It is well known that model-building of chlorine decay in real water distribution systems is difficult because chlorine decay is influenced by many factors (e.g., bulk water demand, pipe-wall demand, piping material, flow velocity, and residence time). In this paper, experiments were run to investigate the kinetic model of chlorine decay and the formation model of trihalomethanes (THMs) in pilot-scale water distribution systems. Experimental results show that the rate constants of chlorine decay, including wall decay and bulk decay, increasing with temperature. Moreover, the kinetic model of chlorine decay and the formation model of THMs describe experiment data of pilot-scale water distribution systems. The effect of different piping material on chlorine decay and THMs formation were also investigated. The rate constants of chlorine decay are ranked in order: stainless steel pipe, ductile iron pipe, and last, polyethelene pipe because wall decay is the largest in stainless steel pipe than that in other piping material. Correspondingly, the rate of THMs formation follows the order of stainless steel pipe, ductile iron pipe, and last, polyethelene pipe because of less chlorine in bulk water reacting with the trihalomethane formation potential (THMFP).
authors.affiliation: College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Li
authors.forename: Y Jeffrey
authors.initials: YJ
authors.lastname: Yang
authors.forename: Jieze
authors.initials: J
authors.lastname: Yu
authors.forename: Tu-qiao
authors.initials: TQ
authors.lastname: Zhang
authors.forename: Xinwei
authors.initials: X
authors.lastname: Mao
authors.forename: Weiyun
authors.initials: W
authors.lastname: Shao
mesh_terms: D002713:Chlorine / Q000737:chemistry*; D007501:Iron; D010865:Pilot Projects; D020959:Polyethylene; D012498:Sanitary Engineering / Q000295:instrumentation; D013193:Stainless Steel; D022882:Trihalomethanes / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014881:Water Supply
chemical_list: D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D013193:Stainless Steel; D002713:Chlorine; D020959:Polyethylene; D007501:Iron