Chloroethene biotransformation in the presence of different sulfate concentrations

Pantazidou, M; Panagiotakis, I; Mamais, D; Zikidi, V

dc.contributor.author	Pantazidou, M	en
dc.contributor.author	Panagiotakis, I	en
dc.contributor.author	Mamais, D	en
dc.contributor.author	Zikidi, V	en
dc.date.accessioned	2014-03-01T02:08:22Z
dc.date.available	2014-03-01T02:08:22Z
dc.date.issued	2012	en
dc.identifier.issn	10693629	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29647
dc.subject.other	Chloroethenes	en
dc.subject.other	Experimental conditions	en
dc.subject.other	Inverse relationship	en
dc.subject.other	Laboratory experiments	en
dc.subject.other	Laboratory studies	en
dc.subject.other	Microbial culture	en
dc.subject.other	Sulfate concentrations	en
dc.subject.other	Sulfate reduction	en
dc.subject.other	Upper limits	en
dc.subject.other	Vinyl chlorides	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Ethylene	en
dc.subject.other	Experiments	en
dc.subject.other	Stoichiometry	en
dc.subject.other	Sulfur compounds	en
dc.subject.other	Trichloroethylene	en
dc.subject.other	Dechlorination	en
dc.subject.other	anoxic conditions	en
dc.subject.other	baseline conditions	en
dc.subject.other	biotransformation	en
dc.subject.other	dechlorination	en
dc.subject.other	ethylene	en
dc.subject.other	field survey	en
dc.subject.other	laboratory method	en
dc.subject.other	performance assessment	en
dc.subject.other	stoichiometry	en
dc.subject.other	sulfate	en
dc.subject.other	Insectivora	en
dc.title	Chloroethene biotransformation in the presence of different sulfate concentrations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1111/j.1745-6592.2011.01372.x	en
heal.identifier.secondary	http://dx.doi.org/10.1111/j.1745-6592.2011.01372.x	en
heal.publicationDate	2012	en
heal.abstract	This paper aims to reconcile discrepancies among reports of dechlorination performance in the presence of sulfate, by analyzing data from the literature, presenting results from laboratory experiments performed with mixed anaerobic microbial cultures, and synthesizing respective findings. A complete set of metrics for dechlorination progress was developed and used in the analysis of selected field and laboratory studies. When differences in site and experimental conditions are accounted for and definitions of dechlorination completeness are harmonized, the inverse relationship between dechlorination performance and sulfate concentration becomes clearer. This relationship was investigated in detail with laboratory experiments on mixed anaerobic microbial cultures enriched with the same concentration of trichloroethylene (TCE) and different sulfate concentrations, equal to near zero (considered as the baseline culture), 30, 400, and 1100 mg/L. In all experiments, sulfate reduction proceeded concurrently with dechlorination. The observed behavior was bimodal, indicating a transition in dechlorination performance between 30 and 400 mg/L. Under low donor to acceptor stoichiometry conditions, TCE dechlorination was incomplete in all experiments after 14 days, while the percentage of TCE moles reduced to vinyl chloride was lower by about 50% in the experiments with high sulfate concentrations. When donor was added in excess to stoichiometry needs for TCE reduction, TCE dechlorination was complete in the baseline culture, while only little ethene was detected in the high sulfate concentration cultures. When all studies are considered together, it appears that the presence of sulfate does not preclude complete dechlorination but rather delays it. Data analysis also suggests that the proposed upper limit of 500 mg/L for the range of initial sulfate concentration that is not problematic for dechlorination should be revised to a lower value. © 2011, The Author(s). Ground Water Monitoring & Remediation © 2011, National Ground Water Association.	en
heal.journalName	Ground Water Monitoring and Remediation	en
dc.identifier.doi	10.1111/j.1745-6592.2011.01372.x	en
dc.identifier.volume	32	en
dc.identifier.issue	1	en
dc.identifier.spage	106	en
dc.identifier.epage	119	en