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Role of Nitrification in Accelerating Chloramine Decay through Application of Microbial Decay Factor (F_m) Method

机译:应用微生物衰变因子(F_m)法硝化在加速氯胺降解中的作用

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Chloramine is widely practiced as a secondary disinfectant in many utilities, including that inrnAustralia and US. Utilities face challenges in maintaining adequate disinfectant residual.rnUsually, nitrification is thought to be responsible for instability of residual and hence mostlyrnmeasurement targets nitrification indicators. To prove/disprove this belief, the authorsrnanalyzed two different types of samples using the microbial decay factor (F_m) method: mildlyrnand severely nitrifying samples. Microbial decay in mildly nitrifying samples was heavilyrndependent on total chlorine residual rather than nitrite levels in the sample and it took placernwithout any signs of nitrification. In severely nitrifying samples suspected soluble microbialrnproducts accelerated chloramine decay much more than the process of nitrification, i.e.rnProduction of nitrite or subsequent drop in pH. Therefore, other processes were found to bernmore significant in accelerating chloramine decay than the nitrification process. For properrncontrol of chloramine residual, measurement of chloramine decay characteristics isrnrecommended.
机译:氯胺已在许多公用事业中广泛用作辅助消毒剂,包括澳大利亚和美国。公用事业在保持足够的消毒剂残留量方面面临挑战。通常,硝化作用被认为是残留物不稳定的原因,因此主要是测量目标硝化指标。为了证明/证明这种信念,作者使用微生物衰减因子(F_m)方法分析了两种不同类型的样品:轻度和重度硝化样品。轻度硝化样品中的微生物衰减很大程度上取决于样品中的总氯残留量,而不是亚硝酸盐含量,并且在没有任何硝化迹象的情况下发生。在严重硝化的样品中,可疑的可溶性微生物产物加速的氯胺降解比硝化过程(即亚硝酸盐的产生或随后pH值降低)的加速作用更大。因此,发现其他过程在加速氯胺降解方面比硝化过程更重要。为了适当地控制氯胺残留,建议测量氯胺的衰减特性。

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