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Title: Salinity effects on biodegradation of Reactive Black 5 for one stage and two stages sequential anaerobic aerobic biological processes employing different anaerobic sludge
Authors: Vyrides, Ioannis 
Bonakdarpour, Babak 
Stuckey, David C. 
Major Field of Science: Engineering and Technology
Field Category: Environmental Engineering
Keywords: Activated sludge;Anaerobic sludge;Decolourisation;Mineralization;Reactive Black 5;Salinity
Issue Date: 1-Nov-2014
Source: International Biodeterioration and Biodegradation, 2014, vol. 95, no. PB, pp. 294-300
Volume: 95
Issue: PB
Start page: 294
End page: 300
Journal: International Biodeterioration and Biodegradation 
Abstract: In this study the effect of NaCl, normally found in dye bath wastewaters employing reactive azo dyes, on the performance of sequential anaerobic-aerobic processes for treatment of Reactive Black 5 (RB5) containing media, with concentration in the range 100-500mgL-1, was investigated. Three possible scenarios of the sequential anaerobic-aerobic process, namely two stage process and one stage processes employing either anaerobic or activated sludge, were considered. The results showed a statistically significant enhancement of the anaerobic decolourisation efficiency as a result of the addition of 30gL-1 NaCl to the RB5 containing media for two stage processes and one stage processes employing anaerobic sludge. NaCl at 30gL-1 concentration also inhibited aerobic colour formation during two stage processes whereas it prevented aerobic decolourisation during one stage processes. HPLC and UV Vis analysis indicated that during anaerobic phase/stage the majority of azo bonds in RB5 molecules cleave whereas the hydrophobicity/MW of the resulting dye reduction metabolites decreases. The same analysis revealed partial mineralisation of RB5 reduction metabolites under aerobic conditions. The results of the present work also showed that the effect of salt on anaerobic decolourisation efficiency, TVFA and methane production was dependent on the exposure history of anaerobic sludge.
ISSN: 0964-8305
DOI: 10.1016/j.ibiod.2014.07.006
Rights: © Elsevier
Type: Article
Affiliation : Cyprus University of Technology 
Amirkabir University of Technology 
Imperial College London 
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