OCCURRENCE OF GLYCOGEN ACCUMULATING ORGANISMS (GAO) AT FULL-SCALE ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL (EBPR) WASTEWATER TREATMENT PLANTS
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.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
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. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites