Azo dye decolorization assisted by chemical and biogenic sulfide

作者：Prato Garcia Dorian; Cervantes Francisco J; Buitron German^*

来源：Journal of Hazardous Materials, 2013, 250: 462-468.

DOI：10.1016/j.jhazmat.2013.02.025

• Azo dye
• Decolorization
• Sulfate reduction
• Sulfide

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.

• 出版日期2013-4-15