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Download fileAnaerobic and hydrogen peroxide decolourisation of azo dyes: a comparative evaluation
conference contribution
posted on 2018-02-12, 15:09 authored by B. Manu, Sanjeev ChaudhuriEfficient decolourisation of azo dyes by anaerobic
biological process and chemical oxidation (ozone, Fenton
and R!O) process has been chaimed by both the
methods. A comparative evaluation of chemical
oxidation (H202 and Fenton's reagent) and anaerobic
process for their efficacy for azo dye decolourisation
has been done. Azo dyes namely, Orange-II (C.I. Acid
Orange 7), Reactive Blue-HR (C.I. Reactive Blue 13),
Reactive Red-HE7B (CJ.Reactive Red 141) and Reactive
Black-3HN (CI.Reactive Black 8) were selected for the
study. Anaerobic decolourisation experiments were
conducted for a period of more than 50 days with a
hydraulic retention time (HRT) of 10 days and at ambient
temperatures. Oxidative decolourisation studies were
conducted with varying peroxide dosage of 1.5 to 50
mM H202 concentrations. Decolourisation efficiencies
achieved during anaerobic process was more than 99%
for all the dyes evaluated. In case of hydrogen peroxide
(SO mM H202 cone.) treated dye solutions,
decolourisation efficiencies observed were 37, 12, 5 and
10% for orange, blue, red and black dye respectively.
Fenton's reagent (Fe(II) + 50 mM H20) achieved 99 %
decolourisation for dyes Orange-II and Reactive BlueH3R.
Therefore it seems that anaerobic process would
be economical for decolourisation of azo dyes m
comparison to chemical oxidation processess.
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