期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 250, 期 -, 页码 462-468出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.02.025
关键词
Azo dye; Decolorization; Sulfate reduction; Sulfide
资金
- CONACyT [100298]
- DGAPA-UNAM [PAPIIT IN104710]
- CEP-UNAM PhD fellowship
The effectiveness of chemical and biogenic sulfide in decolorizing three sulfonated azo dyes and the robustness of a sulfate-reducing process for simultaneous decolorization and sulfate removal were evaluated. The results demonstrated that decolorization of azo dyes assisted by chemical sulfide and anthraquinone-2,6-disulfonate (AQDS) was effective. In the absence of AQDS, biogenic sulfide was more efficient than chemical sulfide for decolorizing the azo dyes. The performance of sulfate-reducing bacteria in attached-growth sequencing batch reactors suggested the absence of competition between the studied azo dyes and the sulfate-reducing process for the reducing equivalents. Additionally, the presence of chemical reduction by-products had an almost negligible effect on the sulfate removal rate, which was nearly constant (94%) after azo dye injection. (c) 2013 Elsevier B.V. All rights reserved.
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