Post-anoxic denitrification driven by PHA and glycogen within enhanced biological phosphorus removal |
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Authors: | Erik R. Coats Alexander MockosFrank J. Loge |
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Affiliation: | a Department of Civil Engineering, University of Idaho, PO Box 441022, Moscow, ID 83844-1022, USA b Department of Civil and Environmental Engineering, University of California Davis, 1 Shields Avenue, Davis, CA 95616, USA |
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Abstract: | The objective of this research was to interrogate and develop a better understanding for a process to achieve post-anoxic denitrification without exogenous carbon augmentation within enhanced biological phosphorus removal (EBPR). Sequencing batch reactors fed real wastewater and seeded with mixed microbial consortia were operated under variable anaerobic-aerobic-anoxic and organic carbon loading conditions. The process consistently achieved phosphorus and nitrogen removal, while the observed specific denitrification rates were markedly higher than expected for post-anoxic systems operated without exogenous organic carbon addition. Investigations revealed that post-anoxic denitrification was predominantly driven by glycogen, an intracellular carbon storage polymer associated with EBPR; moreover, glycogen reserves can be significantly depleted post-anoxically without compromising EBPR. Success of the proposed process is predicated on providing sufficient organic acids in the influent wastewater, such that residual nitrate carried over from the post-anoxic period is reduced and polyhydroxyalkanoate (PHA) synthesis occurs. |
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Keywords: | Enhanced biological phosphorus removal Post-anoxic denitrification Glycogen Polyhydroxyalkanoate |
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