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pubmed-article:16898142pubmed:abstractTextTo meet the effluent requirements given for the sensitive receiving body, the Southpest Wastewater 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.lld:pubmed
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pubmed-article:16898142pubmed:authorpubmed-author:LiuW TWTlld:pubmed
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pubmed-article:16898142pubmed:year2006lld:pubmed
pubmed-article:16898142pubmed:articleTitleProliferation of glycogen accumulating organisms induced by Fe(III) dosing in a domestic wastewater treatment plant.lld:pubmed
pubmed-article:16898142pubmed:affiliationDepartment of Agricultural Chemical Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4., H-111 Budapest, Hungary.lld:pubmed
pubmed-article:16898142pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16898142pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed