消毒过程中氨氮对氯耗的影响研究

某水厂将地下水与管网水混合作为原水,直接加氯后进入清水池,运行中发现清水池出水中的余氯值变化不规律,有时会出现加氯量越多,出水余氯反而越少的现象.通过静态加氯试验验证了氯耗波动的事实,并与氨氮配水试验作对照,发现原水水样与氨氮配水的加氯曲线存在相似性；通过对折点加氯曲线的分析以及与原水加氯曲线的比较,认为原水加氯符合折点加氯特性,氨氮和管网来水中余氯的变化是造成氯耗不稳的原因.

Study on Impact of Ammonia Nitrogen on Chlorine Consumption in Disinfection Process

Water is disinfected by adding chlorine at the entrance of clear well in a waterworks. When chlorine dosage is increased, the residual chlorine in water at the exit of clear well changes randomly, and sometimes the residual chlorine is even reduced. The existence of the unstable chlorine consumption is validated by static state chlorine-adding experiment. It is found that the reaction character between the raw water and chlorine is quite similar to that between ammonia and chlorine. Comparing the break point chlorination and static state chlorine-adding experiment of raw water, the ammonia nitrogen and the unstable residual chlorine in the pipe network water are considered as the reason of unstable chlorine consumption.