随着控制消毒副产物（DBPs）和配电系统中细菌再生的需求日益增加，公用事业公司正在考虑使用一氯胺作为二级消毒剂。虽然它被认为是一种不如氯有效的消毒剂，但作为一种控制配电系统中生物膜的措施，它正受到青睐。部分原因是，仅仅提高饮用水中的氯浓度通常无法控制生物膜或指示生物的存在。事实上，在某些情况下，在游离氯残留量较低的情况下生长的生物膜比平行的未氯化系统含有更多的大肠菌群和异养菌。 本文的目的是描述最近完成的几项研究的结果，其中比较了用游离氯或一氯胺消毒生物膜的能力。讨论的测试系统包括由软钢制成的管式回路反应器和由软钢、球墨铸铁和聚碳酸酯制成的环形反应器。

With the increasing need to control disinfection byproducts (DBPs) and bacterial regrowth in distribution systems, utilities are considering the use of monochloramine as a secondary disinfectant. Although it is considered a less effective disinfectant than chlorine, it is gaining favor as a control measure against biofilms in distribution systems. This is due in part to the fact that simply raising the chlorine concentration in drinking water often does not control biofilms or the presence of indicator organisms. In fact, there are situations where biofilms grown in the presence of low residuals of free chlorine contain higher numbers of coliforms and heterotrophs than parallel unchlorinated systems. The purpose of this paper is to describe results from several recently completed studies where the ability to disinfect biofilms with free chlorine or monochloramine was compared. The test systems discussed include pipe loop reactors made of mild steel and annular reactors of mild steel, ductile iron and polycarbonate.