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Title: Decolorization and biodegradability of dyeing wastewater treated by a TiO₂-sensitized photo-oxidation process
Authors: Li, Xiang-zhong
Zhang, M.
Subjects: Sensitized photo-oxidation
Titanium dioxide
Dyeing effluent
Issue Date: 1996
Publisher: Elsevier Science Ltd on behalf of the IAWQ
Source: Water science and technology, 1996, v. 34, no. 9, p. 49-55.
Abstract: Colour substances in dyeing effluents normally cause certain difficulties in traditional biological treatment processes due to their nonbiodegradable nature. It is necessary to remove colour from dyeing effluents with the help of some physical or chemical treatment processes. This study aims to investigate the colour removal from dyeing wastewater using a TiO₂-sensitized photo-oxidation process and the biodegradability of the products formed in the wastewater. Synthetic dyeing wastewater samples were exposed to near UV radiation at a wavelength of 350 nm in the presence of TiO2 and aeration. The results show that most dyes used in the experiment can be degraded by the sensitized photo-oxidation successfully. Colour removal from the wastewater was above 95% after 4–6 hours treatment. It was found that there was a relationship between the chemical oxygen demand (COD), total organic carbon (TOC) and biochemical oxygen demand (BOD). While COD and TOC in the wastewater were decreased during the reaction, BOD was found to be increased, which implies that the TiO₂-sensitized photo-oxidation can enhance the biodegradability of the dyeing wastewater. As a process, it might be an effective method to remove colour and to further remove COD after treating dyeing effluent by a conventional biological treatment process.
Rights: © IAWQ 1996. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, v. 34, no. 9, p. 49-55, 1996 and is available at
Type: Journal/Magazine Article
DOI: 10.1016/S0273-1223(96)00786-X
ISSN: 0273-1223
Appears in Collections:CEE Journal/Magazine Articles

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