Solid phase studies and geochemical modelling of low-cost permeable reactive barriers

Bartzas, G; Komnitsas, K

dc.contributor.author	Bartzas, G	en
dc.contributor.author	Komnitsas, K	en
dc.date.accessioned	2014-03-01T01:34:37Z
dc.date.available	2014-03-01T01:34:37Z
dc.date.issued	2010	en
dc.identifier.issn	0304-3894	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20774
dc.subject	Acid mine drainage	en
dc.subject	Geochemical modelling	en
dc.subject	Permeable reactive barrier	en
dc.subject	Zero-valent iron	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Acid mine drainage	en
dc.subject.other	Acidic solutions	en
dc.subject.other	Amorphous iron	en
dc.subject.other	Amorphous metals	en
dc.subject.other	Column experiments	en
dc.subject.other	Computer codes	en
dc.subject.other	Corrosion products	en
dc.subject.other	Design and operations	en
dc.subject.other	Dynamic flow conditions	en
dc.subject.other	Geochemical modelling	en
dc.subject.other	Green rust	en
dc.subject.other	Inorganic contaminants	en
dc.subject.other	Intermediate product	en
dc.subject.other	Mackinawite	en
dc.subject.other	Metal removal process	en
dc.subject.other	Mineralogical characterization	en
dc.subject.other	Permeable reactive barriers	en
dc.subject.other	PHREEQC	en
dc.subject.other	Reactive zones	en
dc.subject.other	Reduction-oxidation	en
dc.subject.other	SEM	en
dc.subject.other	Solid-phase	en
dc.subject.other	Zero-valent iron	en
dc.subject.other	Drainage	en
dc.subject.other	Fourier transform infrared spectroscopy	en
dc.subject.other	Fourier transforms	en
dc.subject.other	Heavy metals	en
dc.subject.other	Metal ions	en
dc.subject.other	Polymer blends	en
dc.subject.other	Polyvinyl alcohols	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Silica	en
dc.subject.other	Silica sand	en
dc.subject.other	Sorption	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Water pollution control	en
dc.subject.other	ferric hydroxide	en
dc.subject.other	ferric oxide	en
dc.subject.other	ferrous sulfide	en
dc.subject.other	heavy metal	en
dc.subject.other	inorganic compound	en
dc.subject.other	iron	en
dc.subject.other	magnetite	en
dc.subject.other	silicon dioxide	en
dc.subject.other	sulfate	en
dc.subject.other	sulfide	en
dc.subject.other	acid mine drainage	en
dc.subject.other	corrosion	en
dc.subject.other	experimental study	en
dc.subject.other	FTIR spectroscopy	en
dc.subject.other	geochemical method	en
dc.subject.other	iron	en
dc.subject.other	iron hydroxide	en
dc.subject.other	reactive barrier	en
dc.subject.other	sand	en
dc.subject.other	scanning electron microscopy	en
dc.subject.other	silicate	en
dc.subject.other	solid	en
dc.subject.other	sorption	en
dc.subject.other	sulfate	en
dc.subject.other	X-ray diffraction	en
dc.subject.other	acidity	en
dc.subject.other	article	en
dc.subject.other	computer program	en
dc.subject.other	corrosion	en
dc.subject.other	data base	en
dc.subject.other	dynamics	en
dc.subject.other	geochemistry	en
dc.subject.other	heavy metal removal	en
dc.subject.other	infrared spectroscopy	en
dc.subject.other	mineralogy	en
dc.subject.other	model	en
dc.subject.other	oxidation reduction reaction	en
dc.subject.other	permeability	en
dc.subject.other	permeable reactive barrier	en
dc.subject.other	precipitation	en
dc.subject.other	sand	en
dc.subject.other	scanning electrochemical microscopy	en
dc.subject.other	solid	en
dc.subject.other	water treatment	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Acids	en
dc.subject.other	Adsorption	en
dc.subject.other	Chemical Precipitation	en
dc.subject.other	Iron	en
dc.subject.other	Metals	en
dc.subject.other	Models, Chemical	en
dc.subject.other	Oxidation-Reduction	en
dc.subject.other	Oxides	en
dc.subject.other	Silicon Dioxide	en
dc.subject.other	Solutions	en
dc.subject.other	Sulfates	en
dc.title	Solid phase studies and geochemical modelling of low-cost permeable reactive barriers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jhazmat.2010.07.024	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jhazmat.2010.07.024	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	A continuous column experiment was carried out under dynamic flow conditions in order to study the efficiency of low-cost permeable reactive barriers (PRBs) to remove several inorganic contaminants from acidic solutions. A 50:50 w/w waste iron/sand mixture was used as candidate reactive media in order to activate precipitation and promote sorption and reduction-oxidation mechanisms. Solid phase studies of the exhausted reactive products after column shutdown, using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), confirmed that the principal Fe corrosion products identified in the reactive zone are amorphous iron (hydr)oxides (maghemite/magnetite and goethite), intermediate products (sulfate green rust), and amorphous metal sulfides such as amFeS and/or mackinawite. Geochemical modelling of the metal removal processes, including interactions between reactive media, heavy metal ions and sulfates, and interpretation of the ionic profiles was also carried out by using the speciation/mass transfer computer code PHREEQC-2 and the WATEQ4F database. Mineralogical characterization studies as well as geochemical modelling calculations also indicate that the effect of sulfate and silica sand on the efficiency of the reactive zone should be considered carefully during design and operation of low-cost field PRBs. (C) 2010 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hazardous Materials	en
dc.identifier.doi	10.1016/j.jhazmat.2010.07.024	en
dc.identifier.isi	ISI:000282607600038	en
dc.identifier.volume	183	en
dc.identifier.issue	1-3	en
dc.identifier.spage	301	en
dc.identifier.epage	308	en