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首页> 外文期刊>Journal of Environmental Science and Health >Modeling chlorine-produced oxidant demand and dilution in chlorinated combined sewer overflow discharges
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Modeling chlorine-produced oxidant demand and dilution in chlorinated combined sewer overflow discharges

机译：模拟氯生成的氧化剂需求量以及氯化组合下水道溢流排放物中的稀释度

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摘要

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.
机译：下水道合并溢流（CSO）水将病原体引入接收水域。为了控制病原体的释放，可以添加氯消毒CSO水。添加的氯可能会与水成分反应形成氧化物种，称为氯产生的氧化剂（CPO）。 CPO是在水中添加游离的含氯化合物（例如气态氯或次氯酸盐）时形成的游离和结合的氧化性物质的总和。 CPO排放通常由理事机构监管。当前用于模拟CPO行为的方法不能同时考虑接收水中CPO的衰减和稀释。这项研究创建了一个针对CPO需求和从氯化废水中接收水的稀释的新模型，以便确定实施CSO水消毒制度的特定场所实践。为此，收集了代表性的接收水，并添加了1、2和4 mg / L的氯。加药后每隔30分钟测量一次残留氯。计算了即时和后续的氯需求量，并通过使用拟一级衰减动力学同时应用稀释和衰减来建模后续需求量。模型计算的比较表明，在衰减之前应用稀释会低估CPO需求，而在稀释之前应用衰减会高估CPO需求。

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