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Relating Performance And Bacterial Population Dynamics During The Startup Of A Full-Scale Enhanced Biological Phosphorus Removal Process

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This study examines changes in the bacterial community and the performance of an anaerobic/aerobic Enhanced Biological Phosphorus Removal process during startup. Polyphosphate accumulating organisms (PAOs) increased to over 30% of the bacterial community within two weeks of startup. However, EBPR activity, indicated by phosphorus uptake and release rates, only began to increase after three weeks. The plant reliably met effluent total phosphorus requirements of 1 mg/L within 50 days. The abundance of Candidatus Accumulibacter phosphatis was relatively stable at approximately 10% through the startup, and it was observed with polyphosphate inclusions. Organisms from the genera Arthrobacter, Microlunatus, Nostocoida, and Tetrasphaera never accounted for greater than 1% of the bacterial community. Terminal Restriction Fragment Length Polymorphism revealed no single dominant species. Three novel candidate PAOs belonging to the Flavobacteria, TM7, and γ-Proteobacteria were identified based on correlations between their abundance and the observed performance dynamics.
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Document Type: Research Article

Publication date: 01 January 2008

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