Application of zeolite-Arthrobacter viscosus system for the removal of heavy metal and dye: Chromium and Azure B

► A hybrid system using zeolite and A. viscosus was investigated to treat effluents. ► Optimised conditions in the treatment of Azure B and Cr(VI) were analysed. ► Removal of Azure B by the zeolite was studied using equilibrium isotherms and kinetics. ► The presence of the bacteria facilitates the reduction of Cr (VI) to Cr(III). ► Removal higher than 50% for Cr (VI) and 99% for Azure B were obtained.