Evaluation of ozone as primary disinfectant at the A. H. Weeks WTP, Windsor, Ontario.

The presence of certain pathogenic protozoa such as Cryptosporidium parvum oocyst in drinking water sources made the water treatment industry consider the use of disinfectants that are more effective than chlorine, such as ozone (Jasim, 1999). The Windsor Utilities Commission (WUC) in Windsor, Ontario, Canada, is in the process of implementing ozone (pre-coagulation ozonation) as primary disinfectant at the A. H. Weeks Water Treatment Plant. The system is designed to provide a 2-log (99%) Cryptosporidium inactivation credit. Ozone demand and decay in water is significantly affected by raw water quality, specifically, temperature, pH, and total organic carbon (TOC). The objective of this study was to conduct bench-scale ozone demand and decay experiments to determine the decay rate constant (k), the corresponding ozone half-life, and the 60-second residual value for the raw water during different operating conditions. The study also investigated the effective contact time (T10) provided by the ozonation system through tracer studies. (Abstract shortened by UMI.)Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2001 .S63. Source: Masters Abstracts International, Volume: 40-06, page: 1579. Advisers: Nihar Biswas; Saad Jasim. Thesis (M.A.Sc.)--University of Windsor (Canada), 2001