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Decolorization and biodegradation of the azo dye Congo red by an isolated Acinetobacter baumannii YNWH 226

Abstract

A strict aerobic Acinetobacter baumannii YNWH 226, isolated from an activated sludge reactor treating textile wastewater, was able to grow on Congo red as the sole carbon source under aerobic conditions. The decolorization and TOC reduction efficiency were 99.1 and 93.72%, respectively. The effects of the Congo red concentration were studied. The environmental factors (i.e., pH, temperature and agitation speed) on the biodegradation of Congo red in aqueous phase were studied and evaluated using response surface methodology. The results indicated that when the Congo red concentration was 100 mg/L, the optimal decolorization conditions were as follows: 37°C, pH 7.0 and 180 rpm. The single A. baumannii YNWH 226 was able to form aromatic amines by reductive breakage of the azo bond and then oxidize them into non-toxic metabolites.

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Ning, Xa., Yang, C., Wang, Y. et al. Decolorization and biodegradation of the azo dye Congo red by an isolated Acinetobacter baumannii YNWH 226. Biotechnol Bioproc E 19, 687–695 (2014). https://doi.org/10.1007/s12257-013-0729-y

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  • DOI: https://doi.org/10.1007/s12257-013-0729-y

Keywords

  • Congo red
  • Acinetobacter baumannii
  • biodegradation
  • decolorization
  • response surface methodology