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Zone 7 Water Agency, California
Evaluation of Ozone and Ozone-Peroxide for T&O Control

 


 

The Zone 7 Water Agency operates two surface water treatment plants using water from the Sacramento-San Joaquin Delta. This water source experiences periodic episodes of taste and odor-causing compounds, particularly those formed by algae in the source water. Ozone is known to be effective for taste and odor control, particularly in this water. Numerous studies have been performed evaluating ozone coupled with hydrogen peroxide (called peroxone), most of which indicate that there can be substantial cost savings associated with this process compared to ozone alone. However, no long-term studies of the effectiveness of peroxone had been performed, and several of the water agencies that have designed and installed peroxide feed systems have not used them. WQTS conducted a study to quantify the economic benefits and to assess whether or not the peroxone process offered a significant cost advantage compared to ozone alone. The project included a literature review, a 6-month pilot study, and conceptual design evaluations such as plant layouts, regulatory issues, and assessment of impacts on plant operations.

 
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