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Integrated Approach to Secondary Clarifier Improvements Based on CFD Modeling and Proven Best Practices

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The need for physical, mechanical and process upgrade of six 165-foot diameter peripheral feed secondary clarifiers at the Wayne County, Michigan Downriver Wastewater Treatment Facility (WWTF) was identified as part of a capital improvement program. Improved efficiency was also needed to provide reliable operation for entire range of design conditions. An evaluation of the existing final clarifier process was performed to develop the recommended plan for improvements based on site specific testing, mathematical modeling and consideration of proven best practices. The proposed improvements were recommended based on the modeling with consideration of proven practices and included a new orificebased influent peripheral feed channel, new effluent channel and weirs, and manifold type hydraulic suction mechanisms. Performance testing after installation confirmed the process design parameters were achieved by the upgraded secondary clarifiers.
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Keywords: CFD Model; Secondary clarifier; best practice; peripheral feed

Document Type: Research Article

Publication date: 2010-01-01

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