Altered carbon flow by polyphosphate-accumulating organisms during enhanced biological phosphorus removal

Chang Hoon Ahn, Jae Kwang Park, Liang-Ming Whang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effect of carbon source availability during enhanced biological phosphorus removal (EBPR) was evaluated. To assess the EBPR activity of polyphosphate-accumulating organisms (PAOs), PAO-enriched sludge from a laboratory-scale sequencing batch reactor and activated sludge from a full-scale municipal wastewater treatment plant were used, and their EBRP performances were compared. Spiking with acetate (1000 mg/L chemical oxygen demand) during the aerobic phase disrupted the EBPR performance of both types of sludge; however, when the carbon source was removed, still in the aerobic phase, the EBPR performance of both types of sludge was restored. The PAO-enriched sludge showed 3 to 5 times greater glycogen restoration activity per biomass than the full-scale activated sludge. During high acetate loading in the anaerobic phase, PAOs are supposed to deplete internally stored polyphosphate, causing a ''poly-phosphate limited condition''. Under such a condition, unlike the full-scale activated sludge, the PAO-enriched sludge produced a higher fraction of poly-hydroxylvalerate. It was proposed that PAOs can use the glyoxylate pathway and the methymalonyl-CoA pathway through a full or partial tricarboxylic acid cycle under the anaerobic condition. Water Environ.

Original languageEnglish
Pages (from-to)184-191
Number of pages8
JournalWater Environment Research
Volume81
Issue number2
DOIs
Publication statusPublished - 2009 Jan 1

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology

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