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A Constant SRT Calculated From Liquid Flows …
A Constant SRT Calculated From Liquid Flows improves BNR activated sludge performance Stephen Greenwood, , Metropolitan Council 230 East Fifth Street St. Paul, MN. 55101 Claude Anderson, , Metropolitan Council Mike Rieth, , Metropolitan Council Ted Stein, , Metropolitan Council ABSTRACT Control of Solids Retention Time (SRT) in the activated sludge process is critical for ensuring effective wastewater treatment. SRT sets the growth rate of microorganisms in the activated sludge process, thereby selecting the microbial composition of the mixed liquor and its settling and treatment properties. The industry has developed various methods to control activated sludge . This study evaluated seven (7) methods to calculate SRT and implemented a simple, straightforward hydraulic control of SRT method. The study was conducted at the 34 mgd Seneca WWTP in Eagan, MN, which operates a plug-flow nitrifying activated sludge process with reduced air- Flows in initial zones to enhance phosphorus removal.
A Constant SRT Calculated From Liquid Flows Improves BNR Activated Sludge Performance Stephen Greenwood, P.E., Metropolitan Council 230 East Fifth Street
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