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Title: Comparison of the performance of one stage and two stage sequential anaerobic–aerobic biological processes for the treatment of reactive-azo-dye-containing synthetic wastewaters
Authors: Stuckey, David C. 
Bonakdarpour, Babak 
Vyrides, Ioannis 
Major Field of Science: Natural Sciences
Keywords: Reactive Black 5;Anaerobic–aerobic process;Anaerobic sludge;Activated sludge;Decolourisation;Mineralisation
Issue Date: Jul-2011
Source: International Biodeterioration & Biodegradation, 2011, vol. 65, no. 4, pp. 591-599
Volume: 65
Issue: 4
Start page: 591
End page: 599
Journal: International Biodeterioration and Biodegradation 
Abstract: In the present study the performance of anaerobic-aerobic one and two stage processes for the biological treatment of synthetic wastewaters containing Reactive Black 5 (RB5) were studied and compared with each other. In both processes the majority of colour removal by biodegradation occurred under anaerobic environment. The colour change under aerobic conditions was correlated with extent of anaerobic decolourisation in the preceding phase/stage of the process. Partial mineralisation of the anaerobic dye metabolites, roughly to the same extent, was achieved aerobically in both one stage and two stage processes. The majority of COD was removed in the anaerobic stage for two stage processes and aerobic stage in one stage processes. In one stage processes, the exposure of anaerobic sludge to alternating anaerobic-aerobic environment decreased anaerobic decolourisation efficiency and COD removal; when employing activated sludge, the same exposure enhanced anaerobic substrate utilisation whereas the effect on the anaerobic decolourisation efficiency depended on RB5 concentration. The comparative performance of one and two stage processes in terms of overall dye decolourisation depended on RB5 concentration. Both types of processes brought about similar overall COD removal. Increase in RB5 concentration, in the range studied, resulted in decrease in overall COD removal for both processes.
ISSN: 0964-8305
DOI: 10.1016/j.ibiod.2011.03.002
Rights: © Elsevier
Type: Article
Affiliation: Cyprus University of Technology 
Affiliation : Amirkabir University of Technology 
Imperial College London 
Cyprus University of Technology 
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