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Odor Control Strategy for a Rapidly Changing Treatment Plant

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The City of Tolleson is located in the western suburbs of Phoenix. It operates a 17 MGD wastewater treatment plant (WWTP), with flow from within Tolleson averaging only 4 MGD (of which at least 50 percent consists of industrial discharge). Approximately 9 MGD is treated under contract from the Cities of Peoria and Sun City. In 2008, the City of Peoria pulled out of the Tolleson system and began treatment in their new wastewater treatment facility. This resulted in a loss of approximately 5 MGD, and the revenue to renew their County air permit. The air permit renewal made odor issues a prime concern at the plant.

The City and Brown and Caldwell initiated a plant odor evaluation in 2006 in anticipation of the 2008 County air permit renewal. In the past, odors were not a major concern since the WWTP was primarily surrounded by farmland. However, several residential developments were built within one-half mile of the plant, and odor complaints have increased. Figures 1 and 2 shows the treatment plant and encroaching residential developments. The results of the study identified both interim odor control measures as well as appropriate process improvement and capital projects to address these odor issues. In addition, the study progressed into a significant chemical addition evaluation with ferric chloride and hydrogen peroxide. This element of the project was conducted to provide interim odor control, while longer term improvement projects could be developed.
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Keywords: Sulfide control; ferric chloride; hydrogen peroxide; hydrogen sulfide; odor control; trickling filters

Document Type: Research Article

Publication date: 2010-01-01

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