Abstract :
Chromate and azo dyes are common compounds used in the industrial applications and released into the
environments. Therefore studies of bioremediation treatment methods should involve the removal of both pollutants.
In this study, we report, a novel chromate reducing bacteria with the capability to decolorize 4 type of dye namely
Amaranth Dye, Biebrich Scarlet, Direct Blue 71 and Methanil Yellow under aerobic conditions. The isolate identified
as Pseudomonas Aeruginosa strain MIE3 and reduced 52% of 150 ppm potassium dichromate (Cr(VI)) in the nutrient
broth after 24 hours incubation under shaking condition at 150 rpm. Optimization using one factor at a time (OFAT)
showed the optimal conditions for chromate reduction include nutrient broth concentration was 8 g/L, temperature
between 30 and 35oC, and pH was 7.8. The ability of this bacterium to detoxify these toxicants make the bacterium
a valuable tool for future wastewater and soil bioremediation.
Keyword :
Chromate, Azo dye, Reduction, Decolorization