Environmental Engineering Reference
In-Depth Information
Scheme 10.1
Proposed
bioelectrochemical decol-
orization mechanism for
AO7 was elucidated by
Mu et al. (
2009a
)
10.5.3
Azo Dye Degradation
washing and also resistant to microbial degrada-
tion. The aromatic compounds with one or more
-N = N- groups present in azo dyes makes them
recalcitrant. Azo dyes and their break down prod-
ucts are toxic and mutagenic (Scheme
10.1
; Mu
et al. 2009; Solanki et al.
2013
). About 10-15 %
of the dyes used in textile industry are discharged
in the effluents. (Rajaguru et al.
2000
). An elec-
tron donor is required for the anaerobic biologi-
cal decolorization of azo dyes to create reductive
conditions. Generally it can be an organic cosub-
strate. The decolorization rate of conventional
Residual dyes present in textile wastewater have
attracted a lot of interest due to their intense co-
lour which is also closely associated with toxicity
and aesthetics of the discharged effluents (Pant
et al.
2008
; Venkata Mohan et al.
2013
). Textile
dyes exhibit high resistance to microbial degra-
dation. Particularly azo dyes are readily convert-
ed to hazardous aromatic amines under anoxic
conditions (Yemashova and Kalyuzhnyi
2006
).
These dyes are highly stable under light, during
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