The mechanism of metals precipitation by biologically generated alkalinity in biofilm reactors

Remoudaki, E; Hatzikioseyian, A; Kousi, P; Tsezos, M

dc.contributor.author	Remoudaki, E	en
dc.contributor.author	Hatzikioseyian, A	en
dc.contributor.author	Kousi, P	en
dc.contributor.author	Tsezos, M	en
dc.date.accessioned	2014-03-01T01:19:37Z
dc.date.available	2014-03-01T01:19:37Z
dc.date.issued	2003	en
dc.identifier.issn	0043-1354	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15611
dc.subject	Acetate metabolism	en
dc.subject	Bioprecipitation	en
dc.subject	Heavy metals	en
dc.subject	Moving bed sand filters	en
dc.subject	Wastewater treatment	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Alkalinity	en
dc.subject.other	Biofilms	en
dc.subject.other	Bioreactors	en
dc.subject.other	Carbon	en
dc.subject.other	Metabolism	en
dc.subject.other	pH effects	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Solutions	en
dc.subject.other	Microbial strains	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	acetic acid	en
dc.subject.other	metal	en
dc.subject.other	biofilm	en
dc.subject.other	bioreactor	en
dc.subject.other	heavy metal	en
dc.subject.other	moving bed regime	en
dc.subject.other	precipitation	en
dc.subject.other	sludge	en
dc.subject.other	wastewater treatment	en
dc.subject.other	acclimatization	en
dc.subject.other	alkalinity	en
dc.subject.other	article	en
dc.subject.other	biofilm reactor	en
dc.subject.other	biological monitoring	en
dc.subject.other	inoculation	en
dc.subject.other	microbial growth	en
dc.subject.other	nonhuman	en
dc.subject.other	pH	en
dc.subject.other	precipitation	en
dc.subject.other	priority journal	en
dc.subject.other	Pseudomonas stutzeri	en
dc.subject.other	reactor	en
dc.subject.other	sludge	en
dc.subject.other	waste water management	en
dc.subject.other	Wautersia eutropha	en
dc.subject.other	Adsorption	en
dc.subject.other	Biofilms	en
dc.subject.other	Biomass	en
dc.subject.other	Bioreactors	en
dc.subject.other	Filtration	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Metals	en
dc.subject.other	Particle Size	en
dc.subject.other	Precipitation	en
dc.subject.other	Silicon Dioxide	en
dc.subject.other	Waste Disposal, Fluid	en
dc.title	The mechanism of metals precipitation by biologically generated alkalinity in biofilm reactors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0043-1354(03)00306-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0043-1354(03)00306-3	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Microbial strains, characterized by increased tolerance and ability to grow in metal bearing wastewaters as well as by effective metal sequestering capability by both active (bioaccumulative) and passive (biosorptive) processes, were tested as inoculum for metal laden wastewater treatment systems. Their capacity to grow in metal bearing wastewater, using an easily available and inexpensive carbon source such as acetate, was studied in batch experiments. Two principal conclusions were drawn: (1) Growth was observed for all the strains examined suggesting that the strains can be acclimated to metals bearing wastewaters. (2) Solution pH increased from neutral to alkaline values during growth (pH(initial) = 7, pH(final) = 10). The later was observed systematically for all strains. Metal precipitation, due to the metabolically generated alkalinity is expected as a result. Supporting evidence for this hypothesis was provided during the operation of two pilot moving bed sand filters treating two different metal bearing wastewaters. Acetate was used as carbon source to support the growth and maintenance of microbial biomass on the sand grains of the filters. The characteristics of the sludge produced from the operation of the pilot plants were subsequently studied in the laboratory. Both sludges were significantly loaded with large amounts of metals. A mechanism of metal precipitation induced by the metabolically generated alkalinity, when acetate is used as carbon source, could be proposed as the main process responsible for the metals sequestering inside the moving bed sandfilter reactor. (C) 2003 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(03)00306-3	en
dc.identifier.isi	ISI:000184857700006	en
dc.identifier.volume	37	en
dc.identifier.issue	16	en
dc.identifier.spage	3843	en
dc.identifier.epage	3854	en