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Title: Proliferation of glycogen accumulating organisms induced by Fe(III) dosing in a domestic wastewater treatment plant
Authors: Jobbágy, A.
Literáthy, B.
Wong, M.-T.
Tardy, G.
Liu, W.-T. 
Keywords: Activated sludge
Chemical precipitation
Glycogen accumulating organisms
Phosphorus removal
Polyphosphate accumulating organisms
Issue Date: 2006
Citation: Jobbágy, A., Literáthy, B., Wong, M.-T., Tardy, G., Liu, W.-T. (2006). Proliferation of glycogen accumulating organisms induced by Fe(III) dosing in a domestic wastewater treatment plant. Water Science and Technology 54 (1) : 101-109. ScholarBank@NUS Repository.
Abstract: To meet the effluent requirements given for the sensitive receiving body, the Southpest Wastewafer Treatment Plant of Budapest, Hungary uses a combined activated sludge-biofilter system with chemical precipitation for P removal. Causes of the proliferation of glycogen accumulating organisms (GAOs) observed in the unaerated/oxic activated sludge unit of this system were investigated both in full-scale and in lab-scale experiments combined with a detailed analysis of the microbial communities. Concentration profile measurements throughout the 8-stage activated sludge unit indicated anaerobic conditions in the first two unaerated reactors and low orthophosphate level (< 1 mg l-1) in all of the stages that could not be attributed to the influent quality, but to Fe (III)-dosing to the returned activated sludge. Microbiological analysis revealed the presence of GAOs from the GB group in the Gammaproteobacteria and occasionally tetrad-forming organisms from Actinobacteria, and the absence of Rhodocyclus-related polyphosphate accumulating organisms (PAOs) in the activated sludge samples. Comparative lab-scale studies carried out in two identically arranged UCT-systems with staged anoxic reactors also confirmed that Fe (III)-dosing may result in phosphorus deficiency of the microbial niche, leading to the suppression of growth and EBPR activity of PAOs and to the proliferation of GAOs. © IWA Publishing 2006.
Source Title: Water Science and Technology
ISSN: 02731223
DOI: 10.2166/wst.2006.377
Appears in Collections:Staff Publications

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