Decolorization and toxicity of reactive anthraquinone textile dyes under methanogenic conditions.

摘要: Reductive decolorization of two anthraquinone reactive dyes (Reactive Blue 4, RB4; Reactive 19, RB19) under methanogenic conditions was performed using a mixed, culture. Decolorization the investigated to evaluate rate and extent color removal as well assess possible toxic effects their product(s) on culture function initial dye concentration ranging from 50 300 mg x L(-1). A dextrin/peptone mixture used carbon electron source. high achieved 4.3 29.9 L(-1)h(-1) 73-91% for RB4, 13.0-74.4 90-95% RB19. Initial RB4 concentrations up 100 L(-1) did not result in any significant inhibition. Both 200 RB4-amended cultures, all RB19-amended cultures resulted severe inhibition both acidogenesis methanogenesis. Sequential addition at RB19 accumulation volatile fatty acids (VFAs) very low methane production end first after 44 days incubation. However, second addition, relatively long incubation (384 days), recovery methanogens observed contrast complete methanogenesis Therefore, higher degree than RB4. Addition dye-inhibited gradual (mainly aceticlastic methanogenesis) RB4-inhibited culture, slow but no RB19-inhibited In contrast, 80% H(2)-20% CO(2) gas hydrogenotrophic RB4- cultures. spite achieved.