费城水务局（PWD）于1998年开始进行试点研究，目标是优化现有的处理工艺，并研究未来可能应用的先进技术。整整一年的试点研究致力于测试臭氧作为一种预氧化剂和消毒剂。本研究调查了预臭氧对预处理、过滤和消毒副产物（DBP）形成的影响，以及中间臭氧对DBP形成的影响。本文的目的是总结中间臭氧DBP研究的结果，该研究将中间臭氧和过滤后氯化形成的DBP与单独过滤后氯化形成的DBP进行了比较。包括8个参考文献、表格和图表。

The Philadelphia Water Department (PWD) began pilot studies in 1998, with the goals of optimizing the existing treatment processes and to investigatingadvanced technologies for possible future application. An entire year of pilotstudies was dedicated to testing ozone as both a pre-oxidant and a disinfectant.The study investigated the effects of pre-ozone on pretreatment, filtration, anddisinfection byproduct (DBP) formation and the effects of intermediate ozone onDBP formation. The objective of this paper is to summarize the results ofintermediate ozone DBP studies which compared the DBPs formed with intermediateozone and post filtration chlorination to those formed with post filtrationchlorination alone. Includes 8 references, tables, figure.