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AWWA QTC97129
- Optimization of Ozonation for DDBP and Microbial Control
- Conference Proceeding by American Water Works Association, 01/01/1997
- Publisher: AWWA
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In 1996, the Ann Arbor Water Plant of Ann Arbor, Michigan, began operation of an ozone system to replace monochloramine primary disinfection in order to comply with drinking water regulations. The major water treatment processes at the plant include lime softening, ozone, granular activated carbon filtration and chloramination. A treatment plant optimization program has been initiated that includes the evaluation of the effect of post softening pH on ozonation and resultant impacts on water quality. Experiments were performed in winter when temperatures were low and total organic carbon (TOC) moderate and more are planned for summer. The goal of the study is to determine the optimal operational conditions to simultaneously meet microbial inactivation requirements, minimize disinfection byproduct formation and control costs. The ozone system at the plant was operated at four different post softening pH settings while measurements of CT, DBPs, chemical usage and electrical usage were made. In addition, routine water quality parameters were monitored before and after the ozone system was implemented to examine potential impacts on finished water quality.
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