Azo Dye Decolorizaiton by Consortium HR under High Temperature and Salinity

Abstract

Azo dye is a kind of most commonly used dyes in related industries. As the discharge from azo dye related industries is commonly found with high salinity and temperature, halo-thermophlic microbes able to decolorize azo dyes are required. Consortium HR enriched under 5% salinity and 50°C in this study was mainly composed of Ueribacillus (70.4%), Tepidimicrobium (11.7%) and Clostridium (10.4%). The influence of salinity (1% to 10%) and pH (6 to 10) on the decolorization process were further measured. Meanwhile, consortium HR was identified with ability to decolorize several kinds of azo dyes and the phytotoxicity of the metabolic intermediates was decreased with the incubation time. All the results indicate that consortium HR has a good potential in the decolorization of azo dyes in hypersaline, high temperature and week alkaline conditions.