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Rapid adaptation of activated sludge bacteria into a glycogen accumulating biofilm enabling anaerobic BOD uptake

Hossain, M.I., Paparini, A.ORCID: 0000-0002-1105-5184 and Cord-Ruwisch, R. (2017) Rapid adaptation of activated sludge bacteria into a glycogen accumulating biofilm enabling anaerobic BOD uptake. Bioresource Technology, 228 . pp. 1-8.

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Glycogen accumulating organisms (GAO) are known to allow anaerobic uptake of biological oxygen demand (BOD) in activated sludge wastewater treatment systems. In this study, we report a rapid transition of suspended activated sludge biomass to a GAO dominated biofilm by selective enrichment using sequences of anaerobic loading followed by aerobic exposure of the biofilm to air. The study showed that within eight weeks, a fully operational, GAO dominated biofilm had developed, enabling complete anaerobic BOD uptake at a rate of 256 mg/L/h. The oxygen uptake by the biofilm directly from the atmosphere had been calculated to provide significant energy savings. This study suggests that wastewater treatment plant operators can convert activated sludge systems readily into a “passive aeration” biofilm that avoids costly oxygen transfer to bulk wastewater solution. The described energy efficient BOD removal system provides an opportunity to be coupled with novel nitrogen removal processes such as anammox.

Item Type: Journal Article
Murdoch Affiliation(s): School of Engineering and Information Technology
School of Veterinary and Life Sciences
Publisher: Elsevier BV
Copyright: © 2016 Published by Elsevier Ltd.
United Nations SDGs: Goal 12: Responsible Consumption and Production
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