Impacts of Carbon Source Addition on Denitrification and Phosphorus Uptake in Enhanced Biological Phosphorus Removal Systems

Document Type

Article

Publication Date

2013

Publication Title

Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering

Volume

48

Issue

4

First page number:

464

Last page number:

473

Abstract

In this study, simultaneous denitrification and phosphorus (P) removal were investigated in batch tests using nitrified mixed liquor and secondary wastewater influent from a full-scale treatment plant and different levels of acetate and propionate as supplemental carbon sources. Without supplemental carbon source, denitrification occurred at low rate and P release and P uptake was negatively affected (i.e., P removal of only 59.7%). When acetate and propionate were supplied, denitrification and P release occurred simultaneously under anoxic conditions. For acetate and propionate at a C/N stoichiometric ratio of 7.6, P release was negatively affected by denitrification. For acetate, the percent P removal and denitrification were very similar for C/N ratios of 22 (5X stoichiometric) and 59 (10X stoichiometric). For propionate, both percent P removal and denitrification deteriorated for C/N ratios of 22 (5X stoichiometric) and 45 (10X stoichiometric). It was observed that carbon source added in excess to stoichiometric ratio was consumed in the aerobic zone, but P was not taken up. This implies that PAO bacteria may utilize the excess carbon source in the aerobic zone rather than their polyhydroxyalkanoate (PHA) reserves, thereby promoting deterioration of the system.

Keywords

Acetates; Acetates/metabolism; Analysis of variance; Bioreactors; Bioreactors/microbiology; Carbon; Carbon/metabolism; Denitrification; Kinetics; Pharmacokinetics; Phosphorus; Phosphorus/isolation & purification; Phosphorus/pharmacokinetics; Polyhydroxyalkanoates/metabolism; Propionates; Propionates/metabolism; Sewage; Waste Disposal; Fluid/methods

Disciplines

Civil and Environmental Engineering | Environmental Engineering | Environmental Sciences | Water Resource Management

Language

English

Permissions

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