Effect of selenate and thiosulfate on anaerobic methanol degradation using activated sludge

Eregowda, Tejaswini; Rene, Eldon R.; Matanhike, Luck; Lens, P. N. L.

Effect of selenate and thiosulfate on anaerobic methanol degradation using activated sludge

2020

Eregowda, Tejaswini | Rene, Eldon R. | Matanhike, Luck | Lens, P. N. L. (Piet N. L.)

Anaerobic bioconversion of methanol was tested in the presence of selenate (SeO₄²⁻), thiosulfate (S₂O₃²⁻), and sulfate (SO₄²⁻) as electron acceptors. Complete SeO₄²⁻ reduction occurred at COD:SeO₄²⁻ ratios of 12 and 30, whereas ~ 83% reduction occurred when the COD:SeO₄²⁻ ratio was 6. Methane production did not occur at the three COD:SeO₄²⁻ ratios investigated. Up to 10.1 and 30.9% of S₂O₃²⁻ disproportionated to SO₄²⁻ at COD:S₂O₃²⁻ ratios of 1.2 and 2.25, respectively, and > 99% reduction was observed at both ratios. The presence of S₂O₃²⁻ lowered the methane production by 73.1% at a COD:S₂O₃²⁻ ratio of 1.2 compared to the control (no S₂O₃²⁻). This study showed that biogas production was not preferable for SeO₄²⁻ and S₂O₃²⁻-rich effluents and volatile fatty acid production could be a potential resource recovery option.

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