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Effects of bromide ions on chlorine demand-based prediction of trihalomethanes formation under rechlorination conditions

机译：溴离子对基于氯需求的氯预言条件下三卤甲烷形成的影响

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In order to study effects of bromide ions on the coefficient of proportionality between trihalomethanes formation and chlorine consumption under rechlorination conditions, experiments were carried out in the pilot-scale water distribution system with 570 m2 area. Four factors named flow velocity, pH, concentration of bromide ions and rechlorination were investigated. Experimental results showed that effects of flow velocity and pH on the coefficient of proportionality were small because of huge chlorine decay in bulk water from old pipe. The coefficients of proportionality about bromodichloromethane (BDCM) and dibromochloromethane (DBCM) increased with concentration of bromide ions. The coefficient of proportionality about chloroform decreased with concentration of bromide ions, but effect of bromide ions on tetrachloromethane (TCM) was not significant. Rechlorination conditions can decrease the coefficients of proportionality about BDCM, DBCM and increase chloroform, and also could not change TCM. The experimental results are more close to the actual situation, and have better applicability to water distribution systems.
机译：为了研究溴离子对再氯化条件下三卤甲烷形成与氯消耗之间比例系数的影响，在面积为570 m2的中试规模供水系统中进行了实验。研究了流速，pH，溴离子浓度和再氯化四个因素。实验结果表明，流速和pH值对比例系数的影响较小，这是因为旧管道中的大量氯气会大量分解。溴化二氯甲烷（BDCM）和二溴氯甲烷（DBCM）的比例系数随溴离子浓度的增加而增加。氯仿的比例系数随溴离子浓度的增加而降低，但溴离子对四氯甲烷（TCM）的影响不显着。再氯化条件可以降低BDCM，DBCM的比例系数并增加氯仿，也不会改变TCM。实验结果更接近实际情况，对水分配系统具有较好的适用性。

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