使用氯胺进行消毒后，可以限制管道生物膜中大肠菌群的再生，以及分配系统中消毒副产物（DBPs）的形成。两个公用事业公司的总大肠菌群已从游离氯转化为氯胺。在改造后的一年里，对两个配水系统中的水进行了生物和化学质量监测。大肠菌群的出现在一个系统中被消除，在另一个系统中减少了四倍。然而，可同化有机碳浓度过高（高达375 ug/L）是后一种系统的特征，点蚀也是如此。这两个因素都可能在限制大肠菌群发生方面发挥关键作用。使用氯胺而非游离氯进行消毒后，其优点包括降低大肠菌群浓度、减少异养平板计数和DBP，以及改善消毒剂残留的维持。然而，单靠氯胺化可能不足以控制所有分配系统中的大肠菌群浓度。 包括31个参考文献、表格、图表。

Postdisinfection using chloramines can limit coliform regrowth in pipeline biofilms and formation of disinfection byproducts (DBPs) in distribution systems. Two utilities that have had occurrences of total coliform converted from free chlorine to chloramines. Water in both distribution systems was monitored for biological and chemical quality for a year after the conversion. Coliform occurrences were eliminated in one system and reduced fourfold in the other. However, excessive concentrations of assimilable organic carbon (up to 375 ug/L) were characteristic of the latter system, as was pitting corrosion. Both factors may play a critical role in limiting coliform occurrence. Postdisinfection using chloramines rather than free chlorine has advantages including decreased coliform concentrations, decreased heterotrophic plate count and DBPs, and improved maintenance of a disinfectant residual. However, chloramination alone may not be sufficient to control coliform concentrations in all distribution systems. Includes 31 references, tables, figures.