Bioreduction of selenate in an anaerobic biotrickling filter using methanol as electron donor.

Author(s) Eregowda, T.; Rene, E.R.; Lens, P.N.L.
Journal Chemosphere
Date Published 2019 Jun

The anaerobic bioreduction of selenate, fed in step (up to 60 mg.L) or continuous (∼7 mg.L) trickling mode, in the presence of gas-phase methanol (4.3-50 g m.h) was evaluated in a biotrickling filter (BTF). During the 48 d of step-feed and 41 d of continuous-feed operations, average selenate removal efficiencies (RE) > 90% and ∼68% was achieved, corresponding to a selenate reduction rate of, respectively, 7.3 and 4.5 mg.L.d. During the entire period of BTF operation, 65.6% of the total Se fed as SeO was recovered. Concerning gas-phase methanol, the maximum elimination capacity (EC) was 46.4 g m.h, with a RE > 80%. Methanol was mainly utilized for acetogenesis and converted to volatile fatty acids (VFA) in the liquid-phase. Up to 5000 mg.L of methanol and 800 mg.L of acetate accumulated in the trickling liquid of the BTF.

DOI 10.1016/j.chemosphere.2019.02.158
Keywords Archaea; Bacteria; Biodegradation, Environmental; Bioreactors; Fatty Acids, Volatile; Filtration; Methanol; Oxidation-Reduction; Selenic Acid; Sewage
ISSN 1879-1298
Citation Chemosphere. 2019;225:406413.

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