Abstract
It has been demonstrated that the sulfate-reducing bacteriumDesulfotomaculum orientis can be grown in batch cultures on elemental hydrogen (H2) as an energy source, carbon dioxide (CO2) as a carbon source, and sulfur dioxide (SO2) as a terminal electron acceptor. At sufficiently high H2 partial pressures, complete reduction of SO2 to H2S was observed with 1–2 s of gas-liquid contact time. The maximum specific activity for SO2 reduction was 6.5 mmol SO2/h-g of total biomass protein. The stoichiometry of SO2 reduction with H2 as the electron donor has been determined under these conditions. At low H2 partial pressures, SO2 was both oxidized to sulfate and reduced to hydrogen sulfide (H2S).
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