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Biodecolorization of textile azo dye using Bacillus sp. strain CH12 isolated from alkaline lake.


ABSTRACT: Textile azo dye decolorizing bacteria were isolated from alkaline Lakes Abaya and Chamo using Reactive Red 239 (RR239) dye. Through subsequent screening process, strain CH12 was selected to investigate the effects of nutrient supplement, DO, pH, temperature, dye concentration and types on decolorization. Based on 16S rRNA gene sequence analysis, strain CH12 was identified as Bacillus sp. Decolorization efficiencies were significantly enhanced with carbon (?98%) and organic nitrogen (?100%) supplements. Complete decolorization was also observed under anoxic and anaerobic conditions, and at the temperature of 30 °C and the pH of 10. However, the azo dye decolorization efficiency of strain CH12 was significantly reduced when NaNO3 (1-8%) was supplemented or under aerobic culturing condition (?6%), indicating that RR239 was less preferred electron acceptor. Overall, strain CH12 can be a promising candidate for decolorization applications due to its potential to effectively decolorize higher RR239 concentrations (50-250 mg/L) and six additional dyes.

SUBMITTER: Guadie A 

PROVIDER: S-EPMC5508668 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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Biodecolorization of textile azo dye using <i>Bacillus</i> sp. strain CH12 isolated from alkaline lake.

Guadie Awoke A   Tizazu Samson S   Melese Meseretu M   Guo Wenshan W   Ngo Huu Hao HH   Xia Siqing S  

Biotechnology reports (Amsterdam, Netherlands) 20170706


Textile azo dye decolorizing bacteria were isolated from alkaline Lakes Abaya and Chamo using Reactive Red 239 (RR239) dye. Through subsequent screening process, strain CH12 was selected to investigate the effects of nutrient supplement, DO, pH, temperature, dye concentration and types on decolorization. Based on 16S rRNA gene sequence analysis, strain CH12 was identified as <i>Bacillus</i> sp. Decolorization efficiencies were significantly enhanced with carbon (≥98%) and organic nitrogen (∼100%  ...[more]

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