不锈钢管网中氯胺的生成及衰减规律

依托大型中试给水管网实验平台，研究了不锈钢管中不同形态的氯胺在不同氯氮比(Cl/N)下的生成和衰减.将管网试验结果与烧杯试验结果进行对比，结果表明：在Cl/N为1~12的范围内，不同水质条件下的自由氯、一氯胺和总氯的生成趋势均为去离子水>主体水>不锈钢管；而不锈钢管中二氯胺的生成量远高于烧杯情况下的生成量，且在Cl/N为10时，不锈钢管中二氯胺浓度占总氯浓度的90%以上.不同Cl/N下，不锈钢管中各种形态的氯胺衰减趋势是一致的，一氯胺的衰减速率为 6∶1> 3∶1> 4∶1> 5∶1，随着反应的进行，二氯胺浓度先增大后减小，且这种变化与Cl/N没有明显的相关性.
Formation and decay of different forms of chloramines were analyzed in stainless steel loop. The experimental results show that under the Cl/N ratio of 1~12, the formation of free chlorine, monochloramine and total chlorine in different water qualitity follows the ranking of deionized water> bulk water > stainless steel loop; the formation of dichloramine in stainless steel loop is much higher than that in deionized water and bulk water, at Cl/N ratio of 10, it accounts for more than 90% of the total chlorine. Under different Cl/N ratio, dichloramine first increases and then decreases with time and other forms of chloramines continuously decrease with the reaction time. The decay rate of monochloramine under different Cl/N ratio follows as: 6∶1 > 3∶1 > 4∶1 > 5∶1, the concentration of dichloramine has no obvious correlation with Cl/N ratio.