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Application of Computational Fluid Dynamics to Closed-Loop Bioreactors: II. Simulation of Biological Phosphorus Removal Using Computational Fluid Dynamics

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Based on the International Water Association's (London) Activated Sludge Model No. 2 (ASM2), biochemistry rate expressions for general heterotrophs and phosphorus-accumulating organisms (PAOs) were introduced to a previously developed, three-dimensional computational fluid dynamics (CFD) activated sludge model that characterized the mixing pattern within the outer channel of a full-scale, closed-loop bioreactor. Using acetate as the sole carbon and energy source, CFD simulations for general heterotrophs or PAOs individually agreed well with those of ASM2 for a chemostat with the same operating conditions. Competition between and selection of heterotrophs and PAOs was verified using conventional completely mixed and tanks-in-series models. Then, competition was studied in the CFD model. These results demonstrated that PAOs and heterotrophs can theoretically coexist in a single bioreactor when the oxygen input is appropriate to allow sufficient low-dissolved-oxygen zones to develop.
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Keywords: computational fluid dynamics; heterogeneous; nutrient removal; oxidation ditch; phosphorus; simultaneous

Document Type: Research Article

Affiliations: 1: *Department of Environmental Science, Rutgers University (at time of research); CDM, 2 Penn Center, 1500 JFK Boulevard, Suite 624, Philadelphia, PA 19102; [email protected] 2: CH2M HILL, Englewood, Colorado. 3: Department of Environmental Sciences, Rutgers University.

Publication date: 2007-06-01

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    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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