Laboratory evaluation of Fe0 barriers to treat acidic leachates

Bartzas, G; Komnitsas, K; Paspaliaris, I

dc.contributor.author	Bartzas, G	en
dc.contributor.author	Komnitsas, K	en
dc.contributor.author	Paspaliaris, I	en
dc.date.accessioned	2014-03-01T01:24:33Z
dc.date.available	2014-03-01T01:24:33Z
dc.date.issued	2006	en
dc.identifier.issn	0892-6875	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17325
dc.subject	Acid rock drainage	en
dc.subject	Environmental	en
dc.subject	Leaching	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Mining & Mineral Processing	en
dc.subject.other	Acidity	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Leachate treatment	en
dc.subject.other	Leaching	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Redox reactions	en
dc.subject.other	Remediation	en
dc.subject.other	Waste disposal	en
dc.subject.other	Acid rock drainage	en
dc.subject.other	Environmental	en
dc.subject.other	Metal ion concentrations	en
dc.subject.other	Iron compounds	en
dc.title	Laboratory evaluation of Fe0 barriers to treat acidic leachates	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mineng.2005.09.032	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mineng.2005.09.032	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	In the present study, flow-through column experiments using a series of continuous-flow columns were conducted to investigate the performance of Fe-0 permeable reactive barriers (PRB) for the treatment of acidic leachates generated in active or abandoned mining and waste disposal sites. Simulated AMD solutions of low and high metal ion concentration were pumped at different flow rates into the laboratory system. Concentration profiles under steady-state transport conditions were developed by measuring metal ion concentration at various sampling ports. Results show that metal ion removal is mainly accomplished via redox reactions that initiate precipitation of mineral phases. Sulfate green rust Was identified from the analysis of precipitates formed on the iron surface; Sulfate and heavy metals uptake by green rust is a secondary clean up mechanism. Experimental results as well as geochemical modeling by PHREEQC-2 indicate that cadmium and copper are removed by redox reactions while aluminum, manganese, nickel, cobalt and zinc are mainly removed as metal hydroxides. It is therefore seen than zero-valent iron barriers can be used as an environmentally and economically viable remediation technology for the clean up of acidic leachates loaded with several inorganic contaminants and sulfates and the subsequent prevention of groundwater contamination. (C) 2005 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.2005.09.032	en
dc.identifier.isi	ISI:000235961100016	en
dc.identifier.volume	19	en
dc.identifier.issue	5	en
dc.identifier.spage	505	en
dc.identifier.epage	514	en