Diuron biodegradation in activated sludge batch reactors under aerobic and anoxic conditions

Stasinakis, AS; Kotsifa, S; Gatidou, G; Mamais, D

dc.contributor.author	Stasinakis, AS	en
dc.contributor.author	Kotsifa, S	en
dc.contributor.author	Gatidou, G	en
dc.contributor.author	Mamais, D	en
dc.date.accessioned	2014-03-01T01:30:13Z
dc.date.available	2014-03-01T01:30:13Z
dc.date.issued	2009	en
dc.identifier.issn	0043-1354	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19505
dc.subject	Fate	en
dc.subject	Pesticides	en
dc.subject	Phenylureas	en
dc.subject	Removal	en
dc.subject	Runoff waters	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Activated sludge batch reactors	en
dc.subject.other	Activated sludge reactors	en
dc.subject.other	Aerobic conditions	en
dc.subject.other	Anoxic conditions	en
dc.subject.other	Dichloroaniline	en
dc.subject.other	Diode array detectors	en
dc.subject.other	Fate	en
dc.subject.other	Half-lives	en
dc.subject.other	Hplc dads	en
dc.subject.other	Low concentrations	en
dc.subject.other	Mass-balance calculations	en
dc.subject.other	Parent compounds	en
dc.subject.other	Phenylureas	en
dc.subject.other	Runoff waters	en
dc.subject.other	Solid-phase extractions	en
dc.subject.other	Suspended solids	en
dc.subject.other	Batch reactors	en
dc.subject.other	Bioactivity	en
dc.subject.other	Biochemistry	en
dc.subject.other	Biodegradation	en
dc.subject.other	Biomass	en
dc.subject.other	Biomolecules	en
dc.subject.other	Chromatographic analysis	en
dc.subject.other	Degradation	en
dc.subject.other	Dissolution	en
dc.subject.other	Extraction	en
dc.subject.other	Herbicides	en
dc.subject.other	High performance liquid chromatography	en
dc.subject.other	High pressure liquid chromatography	en
dc.subject.other	Metabolism	en
dc.subject.other	Metabolites	en
dc.subject.other	Microbiology	en
dc.subject.other	Runoff	en
dc.subject.other	Urea	en
dc.subject.other	activated sludge	en
dc.subject.other	anoxic conditions	en
dc.subject.other	biodegradation	en
dc.subject.other	herbicide	en
dc.subject.other	oxic conditions	en
dc.subject.other	Aerobiosis	en
dc.subject.other	Anaerobiosis	en
dc.subject.other	Biodegradation, Environmental	en
dc.subject.other	Biomass	en
dc.subject.other	Bioreactors	en
dc.subject.other	Chromatography, High Pressure Liquid	en
dc.subject.other	Diuron	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Sewage	en
dc.subject.other	Time Factors	en
dc.title	Diuron biodegradation in activated sludge batch reactors under aerobic and anoxic conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.watres.2008.12.040	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.watres.2008.12.040	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Diuron biodegradation was studied in activated sludge reactors and the impacts of aerobic and anoxic conditions, presence of supplemental substrate and biomass acclimatization on its removal were investigated. Diuron and three known metabolites, namely DCPMU (1-(3,4-dichlorophenyl)-3-methylurea), DCPU (1-3,4-dichlorophenylurea) and DCA (3,4-dichloroaniline), were extracted by solid-phase extraction (dissolved phase) or sonication (particulate phase) and determined using High Performance Liquid Chromatography-Diode Array Detector (HPLC-DAD). During the experiments only a minor part of these compounds was associated with the suspended solids. Under aerobic conditions, almost 60% of Diuron was biodegraded, while its major metabolite was DCA. The existence of anoxic conditions increased Diuron biodegradation to more than 95%, while the major metabolite was DCPU. Mass balance calculation showed that a significant fraction of Diuron is mineralized or biotransformed to other unknown metabolites. The presence of low concentrations of supplemental substrate did not affect Diuron biodegradation, whereas the acclimatization of biomass slightly accelerated its elimination under anoxic conditions. Calculation of half-lives showed that under aerobic conditions DCPMU, DCPU and DCA are biodegraded much faster than the parent compound. in the future, the sequential use of anoxic and aerobic conditions could provide sufficient removal of Diuron and its metabolites from runoff waters. (C) 2008 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Water Research	en
dc.identifier.doi	10.1016/j.watres.2008.12.040	en
dc.identifier.isi	ISI:000264616300034	en
dc.identifier.volume	43	en
dc.identifier.issue	5	en
dc.identifier.spage	1471	en
dc.identifier.epage	1479	en