Abstract
The aim of this work was to identify groups of micr oorganisms that are capable of degrading organic ma tter utilizing sulfate as an electron acceptor. The assa y applied for this purpose consisted of running bat ch reactors and monitoring lactate consumption, sulfate reduction a nd sulfide production. A portion of the lactate add ed to the batch reactors was consumed, and the remainder was conver ted into acetic, propionic and butyric acid after 1 11 hours of operation These results indicate the presence of su lfate-reducing bacteria (SRB) catalyzing both compl ete and incomplete oxidation of organic substrates. The sul fate removal efficiency was 49.5% after 1335 hours of operation under an initial sulfate concentration of 1123 mg/L . The SRB concentrations determined by the most pro bable number (MPN) method were 9.0x10 7 cells/mL at the beginning of the assay and 8.0x10 5 cells/mL after 738 hours of operation.
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