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Modeling and verifying chlorine decay and chloroacetic acid formation in drinking water chlorination

Frontiers of Environmental Science & Engineering 2010年第1期4卷 65-72页

作者： Wenjun LIU Shaoying QI Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China Department of Civil&Environmental Engineering University of Illinois at Urbana-Champaign205 N.Mathews AvenueUrbanaIL 61801USA

This study presents a phenomenological model that can be used by the water professionals to quantify chlorine decay and disinfection byproduct(DBP)formation in *** kinetic model was developed by introducing the concept of limiting chlorine demand and extending an established reactive species *** limiting chlorine demand,which quantifies chlorine reactive natural organic matter(NOM)on an equivalent basis,was mathematically defined by the relation between ultimate chlorine residue and initial chlorine *** was found experimentally that NOM in water has limiting chlorine demand that increases with chlorine dose once the ultimate residue is *** results indicated that the complex NOM has a unique ability to adjust chemically to the change in redox condition caused by the free *** is attributed mainly to the redundant functional groups that persist in heterogeneous NOM *** results also demonstrated that the effect of chlorine dose on the rate of chlorine decay can be quantitatively interpreted with the limiting chlorine *** kinetic model developed was validated for chlorine decay and chloroacetic acid formation in finished drinking water.

关键词： chlorine demand chlorine decay chloroacetic acids disinfection byproducts model

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Kinetics of chlorine decay in Water Distribution Systems

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Journal of Donghua University(English Edition) 2004年第1期21卷 140-145页

作者：周建华薛罡赵洪宾汪永辉郭美芳 Guangzhou Municipal Engineering Design & Research Institute Guangzhou 510060 College of Environmental Science and Engineering Donghua University Shanghai 200051 School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 College of Environmental Science and Engineering Donghua University Shanghai 200051 combined first and second-order model which includes bulk decay and wall decay was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC) the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.

A combined first and second-order model, which includes bulk decay and wall decay, was developed to describe chlorine decay in water distribution systems. In the model the bulk decay has complex relationships with total organic carbon (TOC), the initial chlorine concentration and the temperature. Except for the initial stages they can be simplified into a linear increase with TOC, a linear decrease with initial chlorine concentration and an exponential relationship with the temperature. The model also explains why chlorine decays rapidly in the initial stages. The parameters of model are determined by deriving the best fitness with experimental data. And the accuracy of model has been verified by using the experimental data and the monitoring data in a distribution system.

关键词： water distribution systems chlorine decay bulk decay wall decay

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