AWWARF资助的项目“消毒变化对水的长期影响” 许多公用事业公司完成了调查，并提供了描述 他们对消毒方案所做的改变以及他们所做的 发现了配电系统内的水质。这项研究包括 已进行以下更改的实用程序: 氯气转化为臭氧，用于过滤水和未过滤水的初级消毒 系统； 氯转化为二氧化氯进行一次和二次消毒； 氯对紫外线照射进行一次或二次消毒；和 氯气到氯胺，用于二次（分配系统）消毒 过滤水和未过滤水系统。 每一个案例研究都提供了关于效用的背景，以及驱动决策的因素 消毒变化、消毒前后水质变化 微生物质量、消毒副产品、水化学和客户投诉 记录。案例研究强调了每种主要的消毒变化。这项研究的目的是记录中国配水系统水质的变化 所有影响公众健康和水的可接受性的主要领域。最重要的 对水进行消毒是为了提高水的微生物质量。虽然 至少一个世纪以来，氯一直令人钦佩地完成着这项任务 氯气和有机物之间的不良化学反应及其产生 抗氯病原体如蓝氏贾第鞭毛虫和隐孢子虫 水传播病原体推动了对新消毒方案的探索。 作为本项目的初步步骤之一准备的问题文件 理论上或之前记录的从氯到 氯胺， 臭氧 二氧化氯 紫外线 关于水质。议题文件讨论了影响水质变化的关键因素， 对水质的积极影响，对水质的潜在不利影响，以及 填补这些空白所需的信息和数据。 下面的案例研究重点是 成功改变消毒方案，展示模型，为 其他正在考虑改变消毒方案的公用事业公司。包括表格，数字。

For the AWWARF funded project "Long Term Effects of Disinfection Changes on Water Quality", a number of utilities completed surveys and provided information describing the changes that they have made to their disinfection schemes and what they have discovered about the water quality within the distribution system. The study encompasses utilities that have made the following changes: chlorine to ozone for primary disinfection for both filtered and unfiltered water systems; chlorine to chlorine dioxide for primary and secondary disinfection; chlorine to ultraviolet light irradiation for primary or secondary disinfection; and, chlorine to chloramines for secondary (distribution system) disinfection for both filtered and unfiltered water systems. Each case study presents background about the utility, factors driving the decision for disinfection change, water quality before and after the disinfectant change with regard to microbial quality, disinfection byproducts, water chemistry and customer complaint records. The case studies highlight each type of the major disinfection change. The purpose of the study is to document changes in Distribution System Water Quality in all of the major areas that affect public health and acceptance of the water. The foremost reason to disinfect water is to improve the microbiological quality of the water. While chlorine has performed this task admirably for at least a century, the discovery of undesirable chemical reactions between chlorine and organic matter and the emergence of chlorine resistant pathogens such as Giardia lamblia and Cryptosporidium as waterborne pathogens has driven the search for new disinfection schemes. Issue papers prepared as one of the preliminary steps in the this project described theoretical or previously documented effects of a change from chlorine to chloramines, ozone, chlorine dioxide, or ultraviolet light on water quality. The issue papers addressed key factors affecting water quality changes, positive impacts on water quality, potential adverse impacts on water quality, and information gaps and data needed to fill those gaps. The case studies below focus on successful changes in disinfection scheme to present models and provide guidance to other utilities contemplating changes to their disinfection schemes. Includes table, figures.