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DatoValore
TitleEffects of the Feeding Solution Composition on a Reductive/Oxidative Sequential Bioelectrochemical Process for Perchloroethylene Removal
AbstractChlorinated aliphatic hydrocarbons (CAHs) are common groundwater contaminants due to their improper use in several industrial activities. Specialized microorganisms are able to perform the reductive dechlorination (RD) of high-chlorinated CAHs such as perchloroethylene (PCE), while the low-chlorinated ethenes such as vinyl chloride (VC) are more susceptible to oxidative mechanisms performed by aerobic dechlorinating microorganisms. Bioelectrochemical systems can be used as an effective strategy for the stimulation of both anaerobic and aerobic microbial dechlorination, i.e., a biocathode can be used as an electron donor to perform the RD, while a bioanode can provide the oxygen necessary for the aerobic dechlorination reaction. In this study, a sequential bioelectrochemical process constituted by two membrane-less microbial electrolysis cells connected in series has been, for the first time, operated with synthetic groundwater, also containing sulphate and nitrate, to simulate more realistic process conditions due to the possible establishment of competitive processes for the reducing power, with respect to previous research made with a PCE-contaminated mineral medium (with neither sulphate nor nitrate). The shift from mineral medium to synthetic groundwater showed the establishment of sulphate and nitrate reduction and caused the temporary decrease of the PCE removal efficiency from 100% to 85%. The analysis of the RD biomarkers (i.e., Dehalococcoides. mccartyi 16S rRNA and tceA, bvcA, vcrA genes) confirmed the decrement of reductive dechlorination performances after the introduction of the synthetic groundwater, also characterized by a lower ionic strength and nutrients content. On the other hand, the system self-adapted the flowing current to the increased demand for the sulphate and nitrate reduction, so that reducing power was not in defect for the RD, although RD coulombic efficiency was less.
SourceProcesses
KeywordsReductive dechlorinationoxidative dechlorinationbioremediation
JournalProcesses
EditorMDPI, Basel/ Switzerland,
Year2021
TypeArticolo in rivista
DOI10.3390/pr9030405
AuthorsEdoardo Dell'Armi,Marco Zeppilli, Bruna Matturro, Simona Rossetti,Marco Petrangeli Papini, Mauro Majone
Text446289 2021 10.3390/pr9030405 Reductive dechlorination oxidative dechlorination bioremediation Effects of the Feeding Solution Composition on a Reductive/Oxidative Sequential Bioelectrochemical Process for Perchloroethylene Removal Edoardo Dell Armi,Marco Zeppilli, Bruna Matturro, Simona Rossetti,Marco Petrangeli Papini, Mauro Majone Department of Chemistry, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy Water Research Institute IRSA CNR , Via Salaria km 29.300, 00015 Monterotondo RM , Italy Chlorinated aliphatic hydrocarbons CAHs are common groundwater contaminants due to their improper use in several industrial activities. Specialized microorganisms are able to perform the reductive dechlorination RD of high chlorinated CAHs such as perchloroethylene PCE , while the low chlorinated ethenes such as vinyl chloride VC are more susceptible to oxidative mechanisms performed by aerobic dechlorinating microorganisms. Bioelectrochemical systems can be used as an effective strategy for the stimulation of both anaerobic and aerobic microbial dechlorination, i.e., a biocathode can be used as an electron donor to perform the RD, while a bioanode can provide the oxygen necessary for the aerobic dechlorination reaction. In this study, a sequential bioelectrochemical process constituted by two membrane less microbial electrolysis cells connected in series has been, for the first time, operated with synthetic groundwater, also containing sulphate and nitrate, to simulate more realistic process conditions due to the possible establishment of competitive processes for the reducing power, with respect to previous research made with a PCE contaminated mineral medium with neither sulphate nor nitrate . The shift from mineral medium to synthetic groundwater showed the establishment of sulphate and nitrate reduction and caused the temporary decrease of the PCE removal efficiency from 100% to 85%. The analysis of the RD biomarkers i.e., Dehalococcoides. mccartyi 16S rRNA and tceA, bvcA, vcrA genes confirmed the decrement of reductive dechlorination performances after the introduction of the synthetic groundwater, also characterized by a lower ionic strength and nutrients content. On the other hand, the system self adapted the flowing current to the increased demand for the sulphate and nitrate reduction, so that reducing power was not in defect for the RD, although RD coulombic efficiency was less. Published version Articolo in rivista MDPI 2227 9717 Processes Processes simona.rossetti ROSSETTI SIMONA bruna.matturro MATTURRO BRUNA