Effect of chromium(VI) on bacterial kinetics of heterotrophic biomass of activated sludge

Stasinakis, AS; Mamais, D; Thomaidis, NS; Lekkas, TD

dc.contributor.author	Stasinakis, AS	en
dc.contributor.author	Mamais, D	en
dc.contributor.author	Thomaidis, NS	en
dc.contributor.author	Lekkas, TD	en
dc.date.accessioned	2014-03-01T01:17:45Z
dc.date.available	2014-03-01T01:17:45Z
dc.date.issued	2002	en
dc.identifier.issn	0043-1354	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14649
dc.subject	Activated sludge	en
dc.subject	Bacterial kinetics	en
dc.subject	Batch methods	en
dc.subject	Cr(VI)	en
dc.subject	S0/X0 ratio	en
dc.subject	Toxicity	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Bacteria	en
dc.subject.other	Biomass	en
dc.subject.other	Chromium	en
dc.subject.other	Substrates	en
dc.subject.other	Acclimization	en
dc.subject.other	Activated sludge process	en
dc.subject.other	chromium	en
dc.subject.other	volatile agent	en
dc.subject.other	activated sludge	en
dc.subject.other	biomass	en
dc.subject.other	chromium	en
dc.subject.other	kinetics	en
dc.subject.other	acclimatization	en
dc.subject.other	activated sludge	en
dc.subject.other	article	en
dc.subject.other	bacterial growth	en
dc.subject.other	bacterial kinetics	en
dc.subject.other	biomass	en
dc.subject.other	controlled study	en
dc.subject.other	heterotrophy	en
dc.subject.other	nonhuman	en
dc.subject.other	oxidation	en
dc.subject.other	oxygen consumption	en
dc.subject.other	priority journal	en
dc.subject.other	statistical significance	en
dc.subject.other	Biomass	en
dc.subject.other	Carcinogens, Environmental	en
dc.subject.other	Chromium	en
dc.subject.other	Kinetics	en
dc.subject.other	Population Dynamics	en
dc.subject.other	Sewage	en
dc.subject.other	Volatilization	en
dc.subject.other	Bacteria (microorganisms)	en
dc.title	Effect of chromium(VI) on bacterial kinetics of heterotrophic biomass of activated sludge	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0043-1354(02)00018-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0043-1354(02)00018-0	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The effect of hexavalent chromium, Cr(VI), on the maximum specific growth rate, mu(m) and biomass yield, Y-H, of heterotrophic biomass was studied in batch tests conducted under high (= 10) and low (= 1.5) substrate-to-biomass ratios (S-0/X-0). The effects of sludge age and biomass acclimatization to Cr(VI) on the bacterial kinetics were also studied. The M. values were determined by measuring oxygen uptake rate (OUR) and volatile suspended solids (VSS) increase. Cr(VI) concentrations equal or greater than 10 mg 1(-1) inhibited the growth of unacclimatized activated sludge and caused a significant decrease in pm and YH values. The acclimatization of biomass and the selection of a high operating sludge age reduced the inhibitory effect of Cr(VI). At a sludge age of 20 days, Cr(VI) concentrations of <10 mg 1(-1) stimulated bacterial growth as evidenced by an increase in both the mu(m) and Y-H values. Determining mu(m) values by OUR and VSS methods, revealed that the presence of Cr(VI) in unacclimatized biomass caused an inhibitory effect mostly on substrate oxidation, while in acclimatized biomass, anabolic pathways were inhibited more. (C) 2002 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Water Research	en
dc.identifier.doi	10.1016/S0043-1354(02)00018-0	en
dc.identifier.isi	ISI:000177441400021	en
dc.identifier.volume	36	en
dc.identifier.issue	13	en
dc.identifier.spage	3341	en
dc.identifier.epage	3349	en