即将到来的第2阶段消毒剂和消毒副产品规则（第2阶段DBPR） 重点是将消毒副产物（DBPs）限制在可接受的水平 整个分配系统。为了遵守即将到来的第2阶段DBPR和 降低配电系统远端的DBP水平，一些公用事业公司已经 许多人正在考虑将游离氯转化为氯胺，以备将来使用 二次消毒。 在许多公用事业中加入游离氨 氯胺是一种自动化过程。传统上，公用事业公司都会对其业务进行编程 控制系统，使氨的添加量取决于自由流动 余氯，以及设定的氯氨比。 氯气在水中与氨反应 化学计量质量比为4.2:1，相当于氯与氨氮的质量比 比例为5.1:1。传统的方法是按氯气与氨气的比例添加氨气 小于4.2:1，以便在形成后水中保留一些多余的游离氨 氯胺。然而，这种剂量控制方法可能会导致剂量波动 如果成品水中的游离氯残留 波动。本文提供了三种剂量控制方法的比较表:使用传统的氨剂量控制产生过量游离氨 方法使用新的氨剂量控制产生过量游离氨 方法以及新氯气的操作员输入和监控与数据采集（SCADA）输出示例 以及氨供给控制方法。包括桌子。

The impending Stage 2 Disinfectants and Disinfection Byproducts Rule (Stage 2 DBPR) is focused on limiting disinfection byproducts (DBPs) to acceptable levels throughout the entire distribution system. In order to comply with the impending Stage 2 DBPR and reduce DBP levels at the far ends of their distribution systems, some utilities have already converted and many are considering converting from free chlorine to chloramines for secondary disinfection. For many utilities, the addition of ammonia to water with a free chlorine residual to form chloramines is an automated process. Traditionally, utilities have programmed their control systems so that the amount of ammonia being added depends on flow, free chlorine residual, and a set chlorine to ammonia ratio. Chlorine reacts with ammonia in the stoichiometric mass ratio of 4.2:1, equivalent to chlorine to ammonia-nitrogen mass ratio of 5.1:1. The traditional approach is to add ammonia at a chlorine to ammonia ratio less than 4.2:1 so that some excess free ammonia remains in the water after the formation of chloramines. However, this approach to dose control can lead to fluctuations in finished water free ammonia levels if the free chlorine residual in the finished water fluctuates. This paper provides tables comparing three approaches to dose control: resulting excess free ammonia using traditional ammonia dose control approach; resulting excess free ammonia using new ammonia dose control approach; and, example operator inputs and supervisory control and data acquisition (SCADA) outputs for new chlorine and ammonia feed control approach. Includes tables.