Document Detail


Influence of dissolved inorganic carbon and calcium on gas formation and accumulation in iron permeable reactive barriers.
MedLine Citation:
PMID:  23069647     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Uncertainties in long-term reactivity and gas accumulation in Fe(0) permeable reactive barriers still hinder a broad application of this groundwater remediation technology. In this study long-term column experiments were conducted under varying geochemical conditions. Generation of hydrogen by anaerobic corrosion in Fe(0) reactive filters was mainly influenced by the mass flux of dissolved inorganic carbon. Both increased concentrations and volume flows led to a substantial rise in gas generation but only to slight differences of gas accumulation within the pores of the reactive filter. Comparisons of columns with different lengths showed higher averaged corrosion rates in the shorter and lower corrosion rates in the longer columns. Calcium in conjunction with dissolved inorganic carbon formed compact and localized aragonite minerals, while in the absence of calcium chukanovite dominated, which covered and passivated the reactive surface to a higher extent. Magnetite was the major crystalline corrosion product in the absence of carbonate and no decline in long term corrosion rates was observed within up to 700days of operation. Total gas yields of columns were restricted by passivation and approached a volume of approximately 13.5mL/g granulated cast iron.
Authors:
Aki S Ruhl; Anne Weber; Martin Jekel
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-23
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  142-143C     ISSN:  1873-6009     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-10-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  22-32     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Berlin Institute of Technology, Water Quality Control, Str. des 17. Juni 135, 10623 Berlin, Germany. Electronic address: aki.s.ruhl@tu-berlin.de.
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