Preliminary consideration upon oxido-reductive system involved in aerobic biodegradation of some textile dyes

Coloured industrial effluents from dyeing industries represent major environmental problems because of their toxicity. In this paper, we present the analyses results of chemical and biochemical parameters involved in the decolourizations of some reactive (C.I. Reactive Red 120, C.I. Reactive Violet 5, C.I. Reactive Orange 16 and C.I. Reactive Red 243) and basic (C.I. Basic Blue 3, C.I. Basic Yellow 87, C.I. Acid Green 9) textile dyes (chemical oxygen consumption and catalase, peroxidase, dehydrogenase activities). The decolourization is realised by an adapted yeasts consortium, in aerobically conditions, isolated from activated sludge of a textile-water treatment plant. The results showed that both enzymes activity and chemical parameters are dependent on the chemical dye structure, concentrations, as well as cultivation conditions of yeasts consortium.