This article presents the process of biodegradation of aliphatic substances in oily bleaching soil. For the experiment, oily bleaching soil from the NZPT (a fat-processing plant) from the town of Brzeg was used. Its characteristic features were a high aliphatic substance content and low (3.8-4.5) pH. By means of experiment three composites of bacteria and yeast were prepared with the use of field and library strains. In a 44-day process, the mixture of field and library strains caused the aliphatic substance content in the oily bleaching soil to drop by 69-71%. The application of bacterial and yeast strains proved efficient for the aliphatic low-pH waste.