Bacteria were inoculated on different solid media to attain biodegradability of an azo dye (Acid Orange 7). Kaolin, bentonite and powdered
activated carbon (PAC) were selected to be used with cultures of Enterobacter, Pseudomonas and Morganella sp., as bacteria would be able to
degrade several textile dyes. For the solid, to be employed as media, special characteristics are needed with regards to adsorption capacity for
concentrating substrate within the cell environment and an adequate particle size and surface texture for assuring bacterial colonization