TITLE

Cathodic Decolourisation of Dyes in Concentrates from Nanofiltration and Printing Pastes

AUTHOR(S)
Bechtold, T.; Turcanu, A.
PUB. DATE
September 2004
SOURCE
Journal of Applied Electrochemistry;Sep2004, Vol. 34 Issue 9, p903
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Direct cathodic reduction of dyes which contain an azo-goup in the chromophore was successfully used for decolourisation of intensively coloured concentrates from Nanofiltration treatment of textile effluents. Based on laboratory scale experiments, a technical multi-cathode electrolyser was applied for full scale decolourisation experiments at cell currents from 40 to 80 A. The absorbance of the treated wastes decreased from 60 to 80% of the initial value at an energy consumption of 2–8 kWh m-3. Experiments with addition of redox mediator indicate a significant increase in decolourisation rate; however chemical consumption is increased for 0.5–1.5 kg m-3 of waste. The decolourisation of reactive dye containing printing pastes was also achieved at the laboratory scale, where decolourisation of 60–80% was achieved.
ACCESSION #
14360894

 

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