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Azo dyes are a group of chemicals that are largely resistant to aerobic biodegradation and persist in wastewater treatment processes. It has been proposed that zero-valent iron (Fe0) can be used to reduce the azo bond, cleaving the dye molecule into products that are more amenable to mineralization by bacteria in activated sludge processes. Batch anaerobic reduction experiments have been performed for two sulfonated azo dyes, orange G and orange II, to determine reaction kinetics and to identify reduction products. Iron-treated dye solutions, as well as major reduction products (aniline and sulfanilic acid) were subjected to batch biodegradation tests and respirometric analyses to screen for enhanced biodegradability over parent dyes. Results indicate that treatment of orange G and orange II with scrap iron produces aniline and sulfanilic acid as major products that are completely mineralized by an acclimated culture within 24 hours.

Document Type: Research Article


Publication date: 2001-01-01

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