Biotreatments,based on biotransformation of Cr(VI) to Cr(III) which is immobilized as Cr(OH)3, are the most effective methods for the removal of Cr(VI) concentrations below 2 mM. The aim of our study is the application of pure or mixed bacterial cultures for Cr(VI) biotransformation followed by chemical flocculation of Cr(OH)3as a combined treatment for industrial wastes