环境和公共安全效益，再加上第22篇对废水过滤的严格处理要求，使得紫外线应用对再生水消毒具有吸引力。紫外线系统可设计为在最坏情况下提供目标消毒水平，而不考虑有毒残留物或副产品。RP-4的设计表明，如果紫外线系统专门为此目的设计，则符合标题22标准的过滤二级出水的紫外线消毒是氯化的可行替代方案。 回顾过去，紫外线是否适用于再生水消毒的问题应该重新表述。一个更合适的问题可能是，如何进行紫外线设施的规划和设计，以适应使用再生水消毒保护公众健康所需的操作灵活性和可靠性。

The environmental and public safety benefits, coupled with the stringent treatment requirement for effluent filtration under Title 22, make the UV application attractive for reclaimed water disinfection. The UV system can be designed to provide the target level of disinfection under worst-case scenarios without concern for toxic residuals or by-products. The design of RP-4 showed that UV disinfection of filtered secondary effluent to meet Title 22 Standards is a viable alternative to chlorination, if the UV system is designed specifically for this purpose. In retrospect, the question of whether UV is suitable for disinfection of reclaimed water should be rephrased. A more appropriate question may be how to approach the UV facilities planning and design to accommodate the operation flexibility and reliability that is needed for protection of public health with reclaimed water disinfection.