模拟氯化联合下水道溢流排放中氯产生的氧化剂需求和稀释

Austin Taterka, R. Miskewitz, R. Sharp, J. Patoczka
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引用次数: 1

摘要

综合污水溢流(CSO)水引入病原体到接收水。为了控制病原体的释放,可以在CSO水中加入氯消毒。添加的氯可能与水成分反应,形成称为氯生成氧化剂(CPO)的氧化物质。CPO是向水中加入游离含氯化合物(如气态氯或次氯酸盐)后形成的游离和结合氧化物质的总和。CPO的排放通常由管理机构监管。目前模拟CPO行为的方法没有考虑到CPO在接收水中的衰变和稀释。本研究创建了一个新的模型,用于从氯化废水中接收水的CPO需求和稀释,以确定实施CSO水消毒制度的特定地点实践。为此,收集代表性的接收水,并向其添加1、2和4 mg/L的氯。在给药后每隔30分钟测量一次余氯。计算了直接和后续的氯需求,并通过使用伪一级衰变动力学同时应用稀释和衰变来模拟后续需求。模型计算的比较表明,先稀释后衰减的应用低估了CPO需求,而先衰减后稀释的应用高估了CPO需求。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling chlorine-produced oxidant demand and dilution in chlorinated combined sewer overflow discharges
Abstract Combined sewer overflow (CSO) water introduces pathogens to receiving waters. To control pathogenic releases, chlorine may be added to disinfect CSO water. The added chlorine may react with water constituents to form oxidative species known as chlorine-produced oxidants (CPO). CPO are the sum of free and combined oxidative species that form upon adding free chlorine-bearing compounds (e.g. gaseous chlorine or hypochlorite) to water. CPO discharge is often regulated by governing agencies. Current methods to model CPO behavior do not account for CPO decay and dilution simultaneously in receiving water. This study creates a novel model for CPO demand and dilution in receiving water from chlorinated effluent in order to determine site-specific practices for implementation of a CSO water disinfection regime. To do this, representative receiving water was collected and dosed with 1, 2, and 4 mg/L chlorine. The residual chlorine was measured at intervals up to 30 min after dosing. The immediate and subsequent chlorine demand was calculated, with the subsequent demand modeled by simultaneous application of dilution and decay using pseudo-first-order decay kinetics. A comparison of model calculations indicates that application of dilution before decay underestimates CPO demand, while application of decay before dilution overestimates CPO demand.
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