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Fate and toxicity of azo dye metabolites under batch long-term anaerobic incubations

Paper ID Volume ID Publish Year Pages File Format Full-Text
18059 42710 2007 6 PDF Available
Title
Fate and toxicity of azo dye metabolites under batch long-term anaerobic incubations
Abstract

Anaerobic biodegradability and toxicity of five azo dye metabolites (Reactive Black 5, RB 5; Direct Red 28, DR 28; Direct Black 38, DB38; Direct Brown 2, DB2; Direct Yellow 12, DY-12) at parent azo dyes concentrations varying between 200 and 1800 mg l−1 of were studied under long-term incubations such as 72 days. The metabolites of DB 38 and DB2 azo dyes at a concentration of 1800 mg l−1, had low toxicity effect on methanogenic bacteria. TAA measurements in the beginning and last period of incubation period showed that the recovery percentages of aromatic amines for DR 28, DB 38, DB 2 and DY 12 azo dyes, were 57.6, 69.4, 66.5, and 77.1%, respectively. The low recovery of aromatic amines (57–77%) from the reduction of azo dyes was probably due to low level of cleveage of aromatic ring resulting in minor anaerobic transformation of azo dye structure. This study showed that azo dye metabolites (aromatic amines) are partly persistent under anaerobic conditions and had low toxicity under long-term incubations.

Keywords
Dye metabolites; Azo; Anaerobic; Aromatic; Batch
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Fate and toxicity of azo dye metabolites under batch long-term anaerobic incubations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 40, Issue 4, 5 March 2007, Pages 934–939
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us