Degradation of a textile reactive azo dye by a combined biological-photocatalytic process: Candida tropicalis Jks2 -Tio2-UvReportar como inadecuado

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Iranian Journal of Environmental Health Science and Engineering

, 9:33

First Online: 23 December 2012Received: 09 December 2012Accepted: 15 December 2012


In the present study, the decolorization and degradation of Reactive Black 5 RB5 azo dye was investigated by biological, photocatalytic UV-TiO2 and combined processes. Application of Candida tropicalis JKS2 in treatment of the synthetic medium containing RB5 indicated complete decolorization of the dye with 200 mg-L in less than 24 h. Degradation of the aromatic rings, resulting from the destruction of the dye, did not occur during the biological treatment. Mineralization of 50 mg-L RB5 solution was obtained after 80 min by photocatalytic process in presence of 0.2 g-L TiO2. COD chemical oxygen demand was not detectable after complete decolorization of 50 mg-L RB5 solution. However, photocatalytic process was not effective in the removal of the dye at high concentrations ≥200 mg-L. With 200 mg-L concentration, 74.9% of decolorization was achieved after 4 h illumination under photocatalytic process and the absorbance peak in UV region attributed to aromatic rings was not completely removed. A two-step treatment process, namely, biological treatment by yeast followed by photocatalytic degradation, was also assessed. In the combined process with 200 mg-L RB5, absorbance peak in UV region significantly disappeared after 2 h illumination and about 60% COD removal was achieved in the biological step. It is suggested that the combined process is more effective than the biological and photocatalytic treatments in the remediation of aromatic rings.

KeywordsAzo dyes Candida tropicalis Combined wastewater treatment Electronic supplementary materialThe online version of this article doi:10.1186-1735-2746-9-33 contains supplementary material, which is available to authorized users.

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Autor: Narjes Jafari - Rouha Kasra-Kermanshahi - Mohammad Reza Soudi - Amir Hossein Mahvi - Sara Gharavi


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