Enrichment of Dehalococcoides mccartyi spp. from a municipal activated sludge during AQDS-mediated bioelectrochemical dechlorination of 1,2-dichloroethane to ethene

• Type: Article in International Scientific Journal
• Date: 2016-08-01

Authors

P. Leitão (Author) FEUP; Simona Rossetti (Author) Other; Anthony S. Danko (Author) FEUP; Henri Nouws (Author) Other; Federico Aulenta (Author) Other

Journal

Title: Bioresource Technology

Vol. 214

Pages: 426-431

ISSN: 0960-8524

Publisher: Elsevier

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Other information

Authenticus ID: P-00K-E3C

DOI: 10.1016/j.biortech.2016.04.129

Abstract (EN): 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 mu mol/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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6