EN
In work was estimated the occurrence of methylotrophic bacteria in various types of sewage sludge. In the laboratory experiments using selective medium with methanol as a sole carbon source, was determined the number of methylotrophic bacteria. The obtained results indicated, that methylotrophic bacteria in the sewage sludge selected from mechanical sewage-treatment plant occurring on the higher level than in the sewage sludge from biological sewage-treatment plant. However methylotrophic bacteria in comparison to copiotrophic and oligotrophic bacteria was founded on the level no more than a some of per cent. Morphological experiments indicated that dominant group of methylotrophic bacteria were bacilli spore forming independently on the types of sewage sludge.