Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 182, Issue 1-3, Pages 735-742Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.06.096
Keywords
Dye decolorization; Reactive Black 5; Isolation; Consortium; Thermophiles
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Funding
- Xunta de Galicia [PGIDIT 06 PXIB 314376 PR, INCITE08MDS034314PR]
- Fundacion Juana de Vega
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In this study, thermophilic microbial strains from thermal spots in northwestern Spain displaying excellent decolorization capability were isolated. The research work tackled: (i) the ability of consortia to degrade a model di-azo dye Reactive Black at different pHs in flask cultures, obtaining that just neutral pHs licensed degradation levels near to 70%, (ii) the isolation of tree of the bacteria, which rendered possible reaching high levels of decolorization (80%) after just 24 h in aerobic conditions, and which were identified through 16S rRNA sequencing to possess high homology (99%) with Anoxybacillus pushchinoensis, Anoxybacillus kamchatkensis and Anoxybacillus flavithermus, and (iii) the cultivation of the isolates in a bench-scale bioreactor, which led to a decolorization rate two-fold higher than that obtained in flask cultures. Therefore, this work makes up the first time that a decolorization process of an azo dye by thermophilic microorganisms in aerobic conditions is investigated. (C) 2010 Elsevier B.V. All rights reserved.
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