CHARACTERIZATION OF SULFATE-REDUCING BACTERIA ISOLATED FROM SEWAGE DIGESTOR FLUIDS

Sulfate-reducing bacteria isolated from sewage digestor fluids and other natural habitats were characterized by their morphological, physiological and chemical properties. Strains (A-1 and B-1) isolated from drains were identified as Desulfovibrio desulfricans. On the other hand, isolates (F241, 1111 and KOKU) from sewage digestor fluids did not fully coincide with any sulfate-reducing bacteria hitherto described in several features of carbon sources utilization and nutritional requirements. They were thought to be atypical D. desulfricans and were named D. desulfricans subsp. stercorivorus nov. subsp. The cellular fatty acid composition of the isolates was analyzed and used effectively for the identification thereof.