Long-term efficiency and kinetic evaluation of ZVI barriers during clean-up of copper containing solutions

Komnitsas, K; Bartzas, G; Fytas, K; Paspaliaris, I

dc.contributor.author	Komnitsas, K	en
dc.contributor.author	Bartzas, G	en
dc.contributor.author	Fytas, K	en
dc.contributor.author	Paspaliaris, I	en
dc.date.accessioned	2014-03-01T01:26:33Z
dc.date.available	2014-03-01T01:26:33Z
dc.date.issued	2007	en
dc.identifier.issn	0892-6875	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18130
dc.subject	Environmental	en
dc.subject	Modelling	en
dc.subject	Reaction kinetics	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	Corrosion	en
dc.subject.other	Deposition	en
dc.subject.other	Distillation columns	en
dc.subject.other	Energy dispersive spectroscopy	en
dc.subject.other	Flow control	en
dc.subject.other	Passivation	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Breakthrough curves	en
dc.subject.other	Column experiments	en
dc.subject.other	Iron (oxy)hydroxides	en
dc.subject.other	Permeable reactive barriers	en
dc.subject.other	Pore water velocity	en
dc.subject.other	Sand mixture	en
dc.subject.other	Zero-valent iron (ZVI)	en
dc.subject.other	Copper	en
dc.title	Long-term efficiency and kinetic evaluation of ZVI barriers during clean-up of copper containing solutions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mineng.2007.05.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mineng.2007.05.002	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Sixteen continuous column experiments were carried out under dynamic flow conditions in order to study the efficiency of zero-valent iron (ZVI) permeable reactive barriers (PRBs) to remove copper from solutions. The effect of various operational parameters, such as pH of the feed solution (2.5 and 4.5), initial copper concentration (5 and 50 mg/L), pore water velocity (30.48 and 152.40 cm/day) and residence time on iron corrosion and degree of copper removal was evaluated. Breakthrough curves showed that higher initial copper concentration and pore water velocity accelerated iron corrosion and slowed down the rate of copper removal due to the formation of mineral precipitates. The maximum removal rates recorded for initial copper concentrations of 5 and 50 mg/L were 2.68 and 13.33 mg/g of ZVI/sand mixture, after 440 and 227 pore volumes, respectively. The reduction of copper follows a pseudo-first-order kinetics while the rate constants (k(obs),) decrease over time from 0.60 to 0.10 h(-1), indicating thus progressive passivation of the ZVI/sand reactive bed. Mineralogical studies of the exhausted reactive mixture, using XRD and SEM/EDX, confirmed the deposition of copper on the ZVI surface and the formation of iron (oxy)hydroxides. (C) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Minerals Engineering	en
dc.identifier.doi	10.1016/j.mineng.2007.05.002	en
dc.identifier.isi	ISI:000250603800002	en
dc.identifier.volume	20	en
dc.identifier.issue	13	en
dc.identifier.spage	1200	en
dc.identifier.epage	1209	en