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Enrichment of Dehalococcoides mccartyi spp. from a municipal activated sludge during AQDS-mediated bioelectrochemical dechlorination of 1,2-dichloroethane to ethene
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Orientador(es)
Resumo(s)
The application of bioelectrochemical systems (BES) for the treatment of chloroethanes has been so far
limited, in spite of the high frequency that these contaminants are detected at contaminated sites.
This work studied the biodegradation of 1,2-dichloroethane (1,2-DCA) in a lab-scale BES, inoculated with
a municipal activated sludge and operated under a range of conditions, spanning from oxidative to reductive,
both in the presence and in the absence of the humic acid analogue anthraquinone-2,6-disulfonate
(AQDS) as a redox mediator. The results showed stable dechlorination of 1,2-DCA to ethene (up to
65 ± 5 lmol/L d), when the BES was operated at a set potential of 300 mV vs. SHE, in the presence of
AQDS. Sustained filled-and-draw operation resulted in the enrichment of Dehalococcoides mccartyi. The
results of this work provide new insights into the applicability of BES for groundwater remediation
and the potential interaction between biogeochemistry and 1,2-DCA in humics-rich contaminated
aquifers.
Descrição
Palavras-chave
Activated sludge 1,2-Dichloroethane Bioelectrochemical systems Redox mediator Anthraquinone-2,6-disulfonate (AQDS) Dehalococcoides mccartyi
Contexto Educativo
Citação
Editora
Elsevier