Scheda di dettaglio – i prodotti della ricerca

DatoValore
TitleRelative contribution of set cathode potential and external mass transport on TCE dechlorination in a continuous-flow bioelectrochemical reactor
AbstractMicrobial bioelectrochemical systems, which use solid-state cathodes to drive the reductive degradation of contaminants such as the chlorinated hydrocarbons, are recently attracting considerable attention for bioremediation applications. So far, most of the published research has focused on analyzing the influence of key (bio)electrochemical factors influencing contaminant degradation, such as the cathode potential, whereas only few studies have examined the potential impact of mass transport phenomena on process performance. Here we analyzed the performance of a flow-through bioelectrochemical reactor, continuously fed with a synthetic groundwater containing trichloroethene at three different linear fluid velocities (from 0.3 m d(-1) to 1.7 m d(-1)) and three different set cathode potentials (from -250 mV to -450 mV vs. the standard hydrogen electrode). The obtained results demonstrated that, in the range of fluid velocities which are characteristics for natural groundwater systems, mass transport phenomena may strongly influence the rate and extent of reductive dechlorination. Nonetheless, the relative importance of mass transport largely depends on the applied cathode potential which, in turn, controls the intrinsic kinetics of biological reactions and the underlying electron transfer mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.
SourceChemosphere 136, pp. 72–78
KeywordsChlorinated solventTrichloroetheneReductive dechlorinationBioelectrochemical systemBioremediationMass transport phenomena
JournalChemosphere
EditorElsevier, Oxford, Regno Unito
Year2015
TypeArticolo in rivista
DOI10.1016/j.chemosphere.2015.03.092
AuthorsVerdini, Roberta; Aulenta, Federico; de Tora, Francesca; Lai, Agnese; Majone, Mauro
Text339922 2015 10.1016/j.chemosphere.2015.03.092 ISI Web of Science WOS 000357235400010 Chlorinated solvent Trichloroethene Reductive dechlorination Bioelectrochemical system Bioremediation Mass transport phenomena Relative contribution of set cathode potential and external mass transport on TCE dechlorination in a continuous flow bioelectrochemical reactor Verdini, Roberta; Aulenta, Federico; de Tora, Francesca; Lai, Agnese; Majone, Mauro Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Roma, Italy; Water Research Institute IRSA , National Research Council CNR , via Salaria km 29.300, 00015 Monterotondo RM , Italy Microbial bioelectrochemical systems, which use solid state cathodes to drive the reductive degradation of contaminants such as the chlorinated hydrocarbons, are recently attracting considerable attention for bioremediation applications. So far, most of the published research has focused on analyzing the influence of key bio electrochemical factors influencing contaminant degradation, such as the cathode potential, whereas only few studies have examined the potential impact of mass transport phenomena on process performance. Here we analyzed the performance of a flow through bioelectrochemical reactor, continuously fed with a synthetic groundwater containing trichloroethene at three different linear fluid velocities from 0.3 m d 1 to 1.7 m d 1 and three different set cathode potentials from 250 mV to 450 mV vs. the standard hydrogen electrode . The obtained results demonstrated that, in the range of fluid velocities which are characteristics for natural groundwater systems, mass transport phenomena may strongly influence the rate and extent of reductive dechlorination. Nonetheless, the relative importance of mass transport largely depends on the applied cathode potential which, in turn, controls the intrinsic kinetics of biological reactions and the underlying electron transfer mechanisms. C 2015 Elsevier Ltd. All rights reserved. 136 Published version Articolo in rivista Elsevier 0045 6535 Chemosphere Chemosphere Chemosphere Chemosphere. Chemosphere. Environmental chemistry, Chemosphere. Persistent organic pollutants and dioxins, Chemosphere. Environmental toxicology and risk assessment, Chemosphere. Science for Environmental toxicology, federico.aulenta AULENTA FEDERICO TA.P07.017.002 Processi Aerobici e di Dealogenazione Riduttiva per la rimozione dei contaminanti dalle acque