Title

Contrasting the benefits of primary clarification versus prefermentation in activated sludge biological nutrient removal systems

Authors

Authors

T. M. McCue; A. A. Randall;F. G. Eremektar

Comments

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Abbreviated Journal Title

J. Environ. Eng.-ASCE

Keywords

wastewater management; biological treatment; phosphorus; nitrification; denitrification; oxygen demand; COD; GROWTH; Engineering, Environmental; Engineering, Civil; Environmental Sciences

Abstract

The potential benefits prefermentation can provide to biological nutrient removal are measured and compared to the costs of excess oxygen consumption and sludge production incurred by an activated sludge system that utilizes prefermentation, instead of primary clarification. Prefermentation was found to produce superior performance in regards to enhanced biological phosphorus removal. A lower soluble orthophosphorus effluent value [3.2 mg/L for the prefermented activated sludge (PAS) train versus 4.6 mg/L for the control train with primary clarification (PCAS)] and a higher percent phosphorus (% P) content of the biomass (9.0% for the PAS train versus 7.8% for the PCAS train) were both found to be statistically significant (P values of 4.26 x 10(-5) and 0.0082, respectively). In addition statistically significant improvements in denitrification rates and reduced observed yields were observed due to prefermentation. However statistically significant increases in solids inventory and in particular oxygen uptake rates offset these improvements. Waste activated sludge production was slightly higher in the PAS train but was not found to be statistically significant.

Journal Title

Journal of Environmental Engineering-Asce

Volume

132

Issue/Number

9

Publication Date

1-1-2006

Document Type

Article

Language

English

First Page

1061

Last Page

1067

WOS Identifier

WOS:000239886400013

ISSN

0733-9372

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