Photocatalytic and combined anaerobic–photocatalytic treatment of textile dyes

Photocatalytic process based on immobilized titanium dioxide was used to treat crude solutions of azo, anthraquinone and phthalocyanine textile dyes. In addition, the process was applied to the treat autoxidized chemically reduced azo dyes, i.e. representatives of recalcitrant dye residues after bio...

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Detalhes bibliográficos
Autor principal: Harrelkas, F. (author)
Outros Autores: Paulo, Ana M. S. (author), Alves, M. M. (author), Khadir, L. (author), Zahraa, O. (author), Pons, M. N. (author), Van der Zee, F. P. (author)
Formato: article
Idioma:eng
Publicado em: 2008
Assuntos:
Anthraquinone dyes
Autoxidation
Azo dyes
COD removal
Phthalocyanine dyes
Titanium dioxide
Science & Technology
Texto completo:http://hdl.handle.net/1822/8157
País:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/8157
Descrição
Resumo:Photocatalytic process based on immobilized titanium dioxide was used to treat crude solutions of azo, anthraquinone and phthalocyanine textile dyes. In addition, the process was applied to the treat autoxidized chemically reduced azo dyes, i.e. representatives of recalcitrant dye residues after biological sequential anaerobic–aerobic treatment. Photocatalysis was able to remove more than 90% color from crude as well as autoxidized chemically reduced dye solutions. UV-absorbance and COD were also removed but to a lower extent (50% in average). The end products of photocatalytic treatment were not toxic toward methanogenic bacteria. The results demonstrate that photocatalysis can be used as a pre- or post-treatment method to biological anaerobic treatment of dye-containing textile wastewater.

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