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,



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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