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Selection and Enrichment of Denitrifying Phosphorus Accumulating Organisms in Activated Sludge

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Abstract:

Activated sludge from a conventional biological wastewater treatment plant was inoculated into a sequencing batch reactor (SBR) to investigate the techniques and required conditions for the selection and enrichment of denitrifying phosphorus accumulating organisms (DNPAO). The SBR was operated under varying anaerobic, anoxic and aerobic conditions for 3 months. It was demonstrated that enhanced biological phosphorus removal was established rapidly by the application of the Anaerobic/Aerobic process and the selection of DNPAO was achieved by introducing an anoxic phase. With an extension of the anoxic period and increasing nitrate dosage, the community shift between aerobic phosphorus accumulating organisms (PAO) and DNPAO was observed. An approximate 60% DNPAO fraction was obtained in this experiment.

Keywords: Biological phosphorus removal; anoxic phosphate uptake; denitrifying phosphorus accumulating organisms; microbial enrichment; microbial selection

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864709793953782

Publication date: January 1, 2009

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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