Impact of Dynamic Loading on Bio-Phosphorus Removal

by Steven C. Chiesa, Univ of Minnesota, Dep of Civil, Engineering, Minneapolis, MN, USA,
James A. Postiglione, Univ of Minnesota, Dep of Civil, Engineering, Minneapolis, MN, USA,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: The ability of bench-scale activated sludge biological phosphorus removal systems to produce effluents with consistently low phosphorus concentrations was influenced by influent TOC/COD and phosphorus loading pattern. Varying influent phosphorus and TOC/COD concentrations in-sync at 50, 100 and 150 percent of the control value on a random (daily) basis produced an effluent with orthophosphorus concentrations consistently less than 0. 3 mg/l. In contrast, when influent phosphorus and TOC/COD concentrations were independently varied within the same limits, effluent phosphorus concentrations were found to change in conjunction with the same-day loading and the past phosphorus-TOC/COD loading pattern. While long-term orthophosphorus concentrations averaged about 1. 3 mg/l, daily values exceeded 4. 0 mg/l. A parallel reactor system operated for simultaneous nitrogen and phosphorus removal proved even more sensitive to variations in daily influent composition. (Author abstract. )

Subject Headings: Phosphorus | Dynamic loads | Influents | Effluents | Concentrated loads | Activated sludge | Benchmark | Biological processes

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