Abstract
Biological sulfate reduction was investigated at the bench and pilot scales in order to determine optimum culture conditions. Efficient strains of sulfate-reducing bacteria (SRB) were selected by classical microbiological methods and by mutagenesis. Improvement factors, including stripping, scale-up, sulfate, and organic substrate concentrations, have been studied in batch bioreactors.
Two types of pilot-scale bioreactors have been adopted, the first being completely mixed with free cells and the second having two stages with immobilized cells on a fixed bed. An overall bioconversion capacity of 11 kg/m3·d of gypsum and 1.2 kg/m3·d of dissolved organic carbon has been achieved in the two-stage bioreactor.
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Hiligsmann, S., Deswaef, S., Taillieu, X. et al. Production of sulfur from gypsum as an industrial byproduct. Appl Biochem Biotechnol 57, 959–969 (1996). https://doi.org/10.1007/BF02941776
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DOI: https://doi.org/10.1007/BF02941776