近年来，需求的增加和原水质量的下降一直困扰着巴黎郊区的污水处理厂。这些问题在一定程度上被在处理系统的所有阶段逐步实施的改进所抵消，这些改进尽可能依赖现有的设施。由于规划的结构灵活性，未来的改造可以纳入处理方案，以满足日益严格的水质标准。还包括二氧化氯、臭氧、活性炭、氯化和粉末活性炭。包括表格、数字。

In recent years increasing demand and decreasing raw water quality have plagued the treatment plants serving the Paris suburbs. These problems have been partly offset by improvements implemented gradually at all stages of the treatment train, relying as much as possible on the facilities already in place. Thanks to planned structural flexibility, future modifications can be incorporated into the treatment scheme to satisfy increasingly strict water quality standards. Also covered are chlorine dioxide, ozone, activated carbon, chlorination, and powdered activated carbon. Includes tables, figures.