Skip to main content

OCCURRENCE OF GLYCOGEN ACCUMULATING ORGANISMS (GAO) AT FULL-SCALE ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL (EBPR) WASTEWATER TREATMENT PLANTS

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

The presence of Glycogen Accumulating Organisms (GAO), that compete for substrate with Phosphorus Accumulating Organisms (PAO), has been associated with the deterioration and even failure of the Enhanced Biological Phosphorus Removal (EBPR) process in wastewater treatment plants. In the present paper the occurrence of GAO (Competibacter) at full-scale plants designed for EBPR in the Netherlands and the influence of operating and environmental conditions on the PAO and GAO populations present at those plants were studied. Eight municipal wastewater treatment plants were surveyed during (Dutch) winter conditions (water temperature around 12°C). Data regarding their operational and environmental conditions and process configurations were compiled. The EBPR activity from each plant was determined through anaerobic-aerobic batch tests performed with fresh activated sludge. Meanwhile, PAO (Accumulibacter) and GAO (Competibacter) fractions were quantified using Fluorescence in situ Hybridization (FISH). The effects of plant process configuration and operational and environmental conditions were examined and correlated with the activity and occurrence of PAO and GAO fractions. Accumulibacter fractions comprised 9 ± 1 % of total bacterial populations (as EUBacteria) while Competibacter were present in relatively lower fractions (2 ± 2 %). Wastewater treatment plants designed and operated with separate pre-denitrification tanks seemed to favour the growth of Accumulibacter populations than plants where a separate denitrification stage was absent. Besides, higher pH values (pH > 7.0) seemed to have a positive effect on the occurrence of Accumulibacter. Despite their low observed fractions, the potential detrimental effects that Competibacter could cause on biological P-removal systems were observed. However, GAO did not cause a major effect on the evaluated EBPR processes. It seems that observed GAO's appearance was not in the range that would have led to EBPR deterioration. Presumably, the effects of environmental conditions (such as temperature) limited their proliferation.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864707787977424

Publication date: 2007-01-01

More about this publication?
  • 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.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more