Reductive behaviour of acid azo dye based wastewater: Biocatalyst activity in conjunction with enzymatic and bio-electro catalytic evaluation

Bioresource Technology
S SreelathaS Venkata Mohan

Abstract

Present study illustrates the significance of biocatalyst's reductive behaviour in the degradation of dye molecules using glucose as co-substrate. An anaerobic system was operated at a dye concentration of 50mg/l with an organic loading rate (OLR) of 1.36 kg COD/m(3)-day. Decolourization and COD removal efficiencies were observed to be 42% and 48% respectively. Azo reductase (18.9 U) and dehydrogenase enzyme (1.4 μg/ml) activities showed increment with operation time. Anaerobic microenvironment showed dye reduction converting them into aromatic amines. The presence of mediators viz., cytochromes, quinines and Fe-S proteins depicted in the cyclic voltammetry profiles played a crucial role in transfer of electrons for the reduction of dye molecules. Bio-electro kinetic profiles obtained through Tafel analysis showed persistent reduction behaviour, which is in good correlation with dye degradation in the anaerobic microenvironment.

References

Mar 10, 2000·Applied Microbiology and Biotechnology·C O'NeillS Wilcox
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May 10, 2005·Water Research·Frank P van der Zee, Santiago Villaverde
Jul 27, 2007·Ecotoxicology and Environmental Safety·Zhenhua LvHang Min
Aug 14, 2009·Environmental Science & Technology·Yang MuJürg Keller

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