Bioelectrochemical chlorate reduction by Dechloromonas agitata CKB


Bioelectrochemical chlorate reduction by Dechloromonas agitata CKB
AuthorFelipe Torres-Rojas, Diana Muñoz, Natalia Tapia, Camila Canales, Ignacio T.Vargas
Line(s)Critical Resources
Year of Publication2020
Journal TitleBioresource Technology
Bioelectrochemical reactor, Chlorate, Dechloromonas agitata, Biocathode, Microbial Electrochemical Technology

Chlorate has been described as an emerging pollutant that compromises water sources. In this study, bioelectrochemical reactors (BERs) using Dechloromonas agitata CKB, were evaluated as a sustainable alternative for chlorate removal. BERs were operated under flow-recirculation and batch modes with an applied cell-voltage of 0.44 V over a resistance of 1 kΩ. Results show chlorate removal up to 607.288 mg/L. After 115 days, scanning electron microscopy showed biofilm development over the electrodes, and electrochemical impedance spectroscopy confirmed the biocatalytic effect of CKB. The theoretical chlorate bioreduction potential (ε° = 0.792 V) was proven, and a kinetic study indicated that 6 electrons were involved in the reduction mechanism. Finally, a hypothetical bioelectrochemical mechanism for chlorate reduction in a BER was proposed. This research expands upon current knowledge of novel electrochemically active microorganisms and widens the scope of BER applications for chlorate removal.

Corresponding AuthorIgnacio Vargas, Natalia Tapia