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Altered Carbon Flow by Phosphorus Accumulating Organisms during Enhanced Biological Phosphorus Removal

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The effect of carbon source availability on the enhanced biological phosphorus removal (EBPR) was evaluated. In order to assess the EBPR activity of polyphosphate-accumulating organisms (PAOs), the PAO-enriched sludge from a lab-scale sequencing batch reactor (SBR) and the activated sludge from a full-scale municipal wastewater treatment plant were tested and their EBRP performances were compared. With an excessive acetate spiking (1,000 mg COD/L) in the aerobic condition, EBPR activities of both sludges were disturbed. Meanwhile, when any carbon source was removed in the aerobic condition, both sludges showed good EBPR performances. However, PAO-enriched sludge showed 3∼5 times greater glycogen restoration per biomass than full-scale non-EBPR activated sludge. When a high acetate loading occurs under the anaerobic condition, PAOs are supposed to deplete internally stored polyphosphate, causing a ‘poly-phosphate (poly-P) limited condition’. Under such a condition, unlike the fullscale activated sludge, PAO-enriched sludge produced a higher fraction of poly-hydroxylvalerate (PHV). PAOs are thought to use the glyoxylate pathway as well as the methymalonyl-CoA pathway through a full or a part of tricarboxylic acid (TCA) cycle under the anaerobic condition.
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Document Type: Research Article

Publication date: 2007-01-01

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