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Anaerobic and hydrogen peroxide decolourisation of azo dyes: a comparative evaluation

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conference contribution
posted on 12.02.2018, 15:09 by B. Manu, Sanjeev Chaudhuri
Efficient 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-H􀆁R (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.

History

School

  • Architecture, Building and Civil Engineering

Research Unit

  • Water, Engineering and Development Centre (WEDC)

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WEDC Conference

Citation

MANU, B. and CHAUDHURI, S., 2002. Anaerobic and hydrogen peroxide decolourisation of azo dyes: a comparative evaluation. IN: Reed, B. (ed). Sustainable environmental sanitation and water services: Proceedings of the 28th WEDC International Conference, Kolkata (Calcutta), India, 18-22 November 2002, 3p.p.

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© WEDC, Loughborough University

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VoR (Version of Record)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2002

Notes

This is a conference paper.

Other identifier

WEDC_ID:11895

Language

en

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