为了提高隐孢子虫灭活的消毒屏障，底特律水和污水处理部（DWSD）决定对其五座水处理厂（WTP）进行全面的臭氧工艺评估和臭氧升级的概念设计。其中四个水处理厂将需要对传统处理工艺进行臭氧改造，而第五个工厂（水厂公园）将被一个新的处理厂取代，该处理厂将包括一个新的中间（或沉淀水）臭氧设施，用于隐孢子虫灭活。本文介绍了臭氧工艺评估的结果，包括DWSD工厂隐孢子虫灭活工艺设计标准的制定。

To improve disinfection barriers for Cryptosporidium inactivation, Detroit Water and Sewerage Department (DWSD) decided to perform a comprehensive ozone process evaluation and conceptual design of ozone upgrades for its five water treatment plants (WTPs). Four of these WTPs will require ozone retrofits of conventional treatment process trains, while the fifth plant (Waterworks Park) will be replaced by a new treatment plant, which will include a new intermediate (or settled water) ozone facility designed for Cryptosporidium inactivation. This paper presents the results of the ozone process evaluation, including the development of process design criteria for Cryptosporidium inactivation for the DWSD plants.