Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2429
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
Sensitizer
Photo-oxidation
Titanium dioxide
Colour
Dye
Wastewater
Dyeing effluent
Treatment
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 www.iwapublishing.com.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/2429
DOI: 10.1016/S0273-1223(96)00786-X
ISSN: 0273-1223
Appears in Collections:CEE Journal/Magazine Articles

Files in This Item:
File Description SizeFormat 
5.pdfPre-published version223.22 kBAdobe PDFView/Open


All items in the PolyU Institutional Repository are protected by copyright, with all rights reserved, unless otherwise indicated. No item in the PolyU IR may be reproduced for commercial or resale purposes.