Long chain fatty acids removal in selector tanks: Evidence for insufficient Microthrix parvicella control

Noutsopoulos, C; Mamais, D; Andreadakis, A

dc.contributor.author	Noutsopoulos, C	en
dc.contributor.author	Mamais, D	en
dc.contributor.author	Andreadakis, A	en
dc.date.accessioned	2014-03-01T01:33:42Z
dc.date.available	2014-03-01T01:33:42Z
dc.date.issued	2010	en
dc.identifier.issn	1944-3994	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20548
dc.subject	Biosorption	en
dc.subject	Bulking	en
dc.subject	Filaments	en
dc.subject	Floc loading	en
dc.subject	Foaming	en
dc.subject	Long chain fatty acids	en
dc.subject	Microthrix parvicella	en
dc.subject	Selector tanks	en
dc.subject.other	Candidatus Microthrix	en
dc.subject.other	Candidatus Microthrix parvicella	en
dc.title	Long chain fatty acids removal in selector tanks: Evidence for insufficient Microthrix parvicella control	en
heal.type	journalArticle	en
heal.identifier.primary	10/5004/dwt.2010.1410	en
heal.identifier.secondary	http://dx.doi.org/10/5004/dwt.2010.1410	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	Microthrix parvicella is the dominant filamentous microorganism prevailed in biological nutrient removal (BNR) activated sludge systems experiencing temporarily or even permanently filamentous bulking and foaming problems. Reports regarding the ability of M. parvicella to uptake and utilize long chain fatty acids (LCFA) are rather controversial. In the context of this study a series of carbon uptake batch experiments with oleate as the external substrate under aerobic, anoxic and anaerobic conditions were performed in order to investigate the biosorption capacity of activated sludge samples experiencing serious filamentous bulking and foaming problems due to M. parvicella proliferation. According to the results LCFA removal efficiency is reversely proportional to the applied organic loading. Removal efficiencies in the order of 70-90% were observed under aerobic conditions for floc loadings lower than 100 mgCOD/gSS, whereas lower removal efficiencies were experienced (30-40%) for significantly higher fl oc loadings. Similar correlation of removal efficiencies with floc loading was evidenced under anaerobic and anoxic conditions (50% LCFA removal for floc loadings lower than 100 mgCOD/gSS). Based on these findings it can be stated that under the conditions prevailing in anaerobic, anoxic and aerobic selector tanks, only a portion of LCFA is removed, and therefore the remaining LCFA under the completely mixed conditions prevailing at the aeration zone of a bioreactor would establish low enough floc loadings, thus stimulating M. parvicella growth. © 2010 Desalination Publications. All rights reserved.	en
heal.publisher	DESALINATION PUBL	en
heal.journalName	Desalination and Water Treatment	en
dc.identifier.doi	10/5004/dwt.2010.1410	en
dc.identifier.isi	ISI:000285631000004	en
dc.identifier.volume	23	en
dc.identifier.issue	1-3	en
dc.identifier.spage	20	en
dc.identifier.epage	25	en