A continuous-flow bioelectrochemical reactor was developed in a previous study to address the bioremediation of groundwater contaminated by trichloroethene (TCE). The present report investigated the applicability of the same system in the presence of Cr(VI) and its possible inhibitory effect on dehalorespiring bacterial populations. Preliminary batch tests were performed at the optimal cathodic reducing potential for the reductive dechlorination (RD) of TCE (-0.65 V vs. the standard hydrogen electrode) with two different dechlorinating microorganism consortia. The results demonstrated that Cr(VI) removal efficacy was increased by microorganisms that had been previously acclimatised to Cr(VI). Specifically, Cr(VI) was completely reduced only in the presence of acclimated microorganisms. The presence of chromate negatively affected RD performance, by either (i) limiting the TCE transformation to cis-dichloroethene at lower concentrations, or (ii) completely inhibiting RD at higher concentrations. In contrast, after the acclimation period, RD was extended down to vinyl chloride, which is the main TCE daughter product. Finally, the continuous flow reactor was fed by synthetic groundwater contaminated with TCE (50 μM) and Cr(VI) (45 μM), and the experimental results showed that Cr(VI) was completely reduced under RD conditions. Moreover, TCE removal was complete, with vinyl chloride and ethene as the main intermediates, thus indicating that chromate inhibition was decreased by Cr(VI) removal.

Chromate fate and effect in bioelectrochemical systems for remediation of chlorinated solvents / Lai, A.; Astolfi, M. L.; Bertelli, V.; Agostinelli, V. G.; Zeppilli, M.; Majone, M.. - In: NEW BIOTECHNOLOGY. - ISSN 1871-6784. - 60:(2021), pp. 27-35. [10.1016/j.nbt.2020.06.006]

Chromate fate and effect in bioelectrochemical systems for remediation of chlorinated solvents

Lai A.
;
Astolfi M. L.;Zeppilli M.;Majone M.
2021

Abstract

A continuous-flow bioelectrochemical reactor was developed in a previous study to address the bioremediation of groundwater contaminated by trichloroethene (TCE). The present report investigated the applicability of the same system in the presence of Cr(VI) and its possible inhibitory effect on dehalorespiring bacterial populations. Preliminary batch tests were performed at the optimal cathodic reducing potential for the reductive dechlorination (RD) of TCE (-0.65 V vs. the standard hydrogen electrode) with two different dechlorinating microorganism consortia. The results demonstrated that Cr(VI) removal efficacy was increased by microorganisms that had been previously acclimatised to Cr(VI). Specifically, Cr(VI) was completely reduced only in the presence of acclimated microorganisms. The presence of chromate negatively affected RD performance, by either (i) limiting the TCE transformation to cis-dichloroethene at lower concentrations, or (ii) completely inhibiting RD at higher concentrations. In contrast, after the acclimation period, RD was extended down to vinyl chloride, which is the main TCE daughter product. Finally, the continuous flow reactor was fed by synthetic groundwater contaminated with TCE (50 μM) and Cr(VI) (45 μM), and the experimental results showed that Cr(VI) was completely reduced under RD conditions. Moreover, TCE removal was complete, with vinyl chloride and ethene as the main intermediates, thus indicating that chromate inhibition was decreased by Cr(VI) removal.
2021
Bioelectrochemical system; bioremediation; chlorinated solvents; Cr(VI) reduction
01 Pubblicazione su rivista::01a Articolo in rivista
Chromate fate and effect in bioelectrochemical systems for remediation of chlorinated solvents / Lai, A.; Astolfi, M. L.; Bertelli, V.; Agostinelli, V. G.; Zeppilli, M.; Majone, M.. - In: NEW BIOTECHNOLOGY. - ISSN 1871-6784. - 60:(2021), pp. 27-35. [10.1016/j.nbt.2020.06.006]
File allegati a questo prodotto
File Dimensione Formato  
New BIOTECHNOLOGY 60 (2020) 27-35.pdf

Open Access dal 26/01/2023

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.87 MB
Formato Adobe PDF
1.87 MB Adobe PDF
L41. New BIOTECHNOLOGY pre-proof (2020).pdf

accesso aperto

Tipologia: Documento in Pre-print (manoscritto inviato all'editore, precedente alla peer review)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 3.22 MB
Formato Adobe PDF
3.22 MB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1438381
Citazioni
  • ???jsp.display-item.citation.pmc??? 3
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact