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Operating Chemically Enhanced Clarification for Optimum Disinfection Performance

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The Milwaukee Metropolitan Sewerage District conducted demonstration tests in 2005 to evaluate chemically enhanced clarification (CEC) of wet-weather flows at the District's two wastewater treatment plants (WWTPs). CEC offers the potential to treat intermittent high wetweather flows, produce high-quality effluent, and fit into the limited space at the plant sites. Two CEC processes were tested at the South Shore WWTP: DensaDeg®, manufactured by Infilco Degremont, and ACTIFLO®, manufactured by Krüger. Primary clarifier influent was the wastewater source, and it was split between the two CEC processes. Testing was conducted during both dry- and wet-weather conditions.

The CEC demonstration testing program had the following specific objectives: evaluate the performance of the selected CEC technologies, evaluate the feasibility of UV disinfection for CEC effluent, compare CEC treatment to existing secondary treatment, and determine key design criteria for full-scale application of CEC for wet-weather flows at Jones Island and South Shore WWTPs.

The CEC demonstration testing at the South Shore WWTP provided a wealth of data that assisted the District in conceptual design evaluations of wet-weather treatment alternatives. The CEC processes provided high levels of treatment at very high overflow rates, minimizing their footprint for inclusion at either the Jones Island or South Shore WWTPs.

Document Type: Research Article


Publication date: 2006-01-01

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