Survival strategies of polyphosphate accumulating organisms and glycogen accumulating organisms under conditions of low organic loading

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Enhanced biological phosphorus removal (EBPR) is usually limited by organic carbon availability in wastewater treatment plants (WWTPs). Polyphosphate accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) were operated under extended periods with low organic carbon loading in order to examine its impact on their activity and survival. The decrease in organic carbon load affected PAOs and GAOs in different ways, where the biomass decay rate of GAOs was approximately 4. times higher than PAOs. PAOs tended to conserve a relatively high residual concentration of polyhydroxyalkanoates (PHAs) under aerobic conditions, while GAOs tended to deplete their available PHA more rapidly. This slower oxidation rate of PHA by PAOs at residual concentration levels enabled them to maintain an energy source for aerobic maintenance processes for longer than GAOs. This may provide PAOs with an advantage over GAOs in surviving the low organic loading conditions commonly found in full-scale wastewater treatment plants.

Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalBioresource Technology
Volume172
DOIs
Publication statusPublished - 20 Sep 2014

Keywords

  • Enhanced biological phosphorus removal (EBPR)
  • Glycogen accumulating organisms (GAO)
  • Maintenance processes
  • Organic loading
  • Polyphosphate accumulating organisms (PAO)

Fingerprint

Dive into the research topics of 'Survival strategies of polyphosphate accumulating organisms and glycogen accumulating organisms under conditions of low organic loading'. Together they form a unique fingerprint.

Cite this