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Title: On-site treatment of dyeing wastewater by a bio-photoreactor system
Authors: Li, XZ
Zhao, YG
Keywords: Dyeing wastewater
Biological treatment
Photocatalytic oxidation
Titanium dioxide
Sensitized photo-oxidation
Issue Date: 1997
Publisher: Elsevier Science Ltd on behalf of the IAWQ
Source: Water science and technology, 1997, v. 36, no. 2-3, p. 165-172 How to cite?
Journal: Water science and technology 
Abstract: Synthetic dyeing wastewater consisting of the three different commercial dyes with different strengths of COD (about 900 and 3000 mg/l respectively) was initially treated by an aerobic biological process. Intermittently Decanted Extended Aeration reactor (IDEA), for BOD removal, and then continuously treated by a TiO?sensitised photoreactor for a further COD removal and decolorization. The catalysed photo-oxidation process can degrade those non-biodegradable organic substances in the effluent treated by the IDEA process and also decolorize the effluent completely. It is also found that some nonbiodegradable organic substances can be converted to biodegradable forms by the sensitized photo-oxidation reaction. A bio-photoreactor system was designed to combine this photocatalytic reactor with the IDEA reactor for the treatment of dyeing wastewater. The performance of this combined bio-photoreactor system with and without recirculation was investigated and compared. The system with recycled water has similar efficiency for decolorization and COD removal to that without recirculation, but has a high capacity to eliminate the effects caused by a shock loading, and also the system can treat dyeing wastewater with a higher organic concentration.
ISSN: 0273-1223
DOI: 10.1016/S0273-1223(97)00384-3
Rights: ? IAWQ 1997. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, v. 36, no. 2-3, p. 165-172, 1997 and is available at
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