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Reductive decolorization of two anthraquinone reactive dyes (Reactive Blue 4, RB4; Reactive Blue 19, RB19) under methanogenic conditions was performed. Using a mixed, methanogenic culture, decolorization of the two anthraquinone dyes was investigated to evaluate the rate and extent of color removal as well as to assess possible toxic effects of the dyes and their decolorization product(s) on the methanogenic culture as a function of initial dye concentration ranging from 50 to 300 mg/L. A high rate and extent of decolorization was achieved ranging from 73 to 91% for RB4, and 90 to 95% for RB19. RB4 at an initial dye concentration up to 100 mg/L did not result in any significant inhibition of the production and consumption of VFAs, as well as the methane production. Both the 200 and 300 mg/L RB4-amended cultures, and all RB19-amended cultures (even the 50 mg/L RB19-amended culture) showed severe inhibition of both acidogenesis and methanogenesis resulting in accumulation of volatile fatty acids (mainly acetate and propionate) and methane production only 54 to 59% of the methane produced by the control culture. Therefore, RB19 was much more toxic to the methanogenic cultures than RB4 in terms of both VFA production and VFA conversion to methane. In spite of the relatively high toxicity of the two anthraquinone dyes on the methanogenic culture, a high extent of color removal was achieved by the methanogenic culture.
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Document Type: Research Article

Publication date: 2002-01-01

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