Effects of Temperature and Mean Cell Residence Time on Enhanced Biological Phosphorus Removal

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by S. A. McClintock, Penn State Harrisburg, Middletown, United States,
C. W. Randall, Penn State Harrisburg, Middletown, United States,
V. M. Pattarkine, Penn State Harrisburg, Middletown, United States,

Document Type: Proceeding Paper

Part of: Environmental Engineering:

Abstract: The effects of temperature and mean cell residence time (MCRT) on biological phosphorus and nitrogen removal were investigated by operating pilot-scale continuous-flow activated sludge reactors over a range of temperatures and MCRTs. Two reactors were operated as high-rate Virginia Initiative Plant (VIP) biological nutrient removal (BNR) processes, and a third was operated as a conventional, fully aerobic activated sludge process for comparison. The BNR systems were operated at MCRTs of both 5 and 15 days, while the conventional system was operated at an MCRT of 5 days at temperatures of 10, 15, and 20°C. Decreasing temperatures had an adverse effect on the performance of enhanced biological phosphorus removal (EBPR), with 5-day MCRT being more affected than 15-day MCRT. Operation at 5-day MCRT and 10°C resulted in a washout of organisms responsible for EBPR. Nitrification, however, was more sensitive to washout than was EBPR under all experimental conditions.

Subject Headings: Temperature effects | Phosphorus | Residence time | Biological processes | Aerobic processes | Waste treatment | Activated sludge | Nitrogen | North America | Virginia | United States

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