Journal
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
Volume 94, Issue -, Pages 99-104Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2014.12.011
Keywords
Biodegradation; Acid orange 7; Anaerobic-aerobic sequential treatment; Aromatic amines
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Funding
- Universitat Rovira i Virgili
- MICINN, Spanish Government [CTM2011-23069]
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The decolorization of azo dye Acid Orange 7 (AO7) was studied in a sequential anaerobic/aerobic reactor system; the anaerobic stage was carried out in a continuous upflow stirred packed-bed reactor (USPBR) filled with biological sludge carbonaceous material (BSCM) and aerobic stage took place in an aerobic membrane bioreactor (aerobic MBR). In a continuous USPBR-BSCM system, azo dye bioconversion rates were about 99% at very short space times (tau) 1.02-16 min. In the sequential aerobic stage, hydraulic retention times (HRTs) were determined on removal efficiencies of chemical oxygen demand (COD), resulting about 66% at 48 h. Total organic carbon (TOC) assay showed a removal efficiency about 54.37%, suggesting the degradation of the aromatic amines produced in the anaerobic reactor. Total aromatic amine (TAA) values were 45.30 and 8.97 mg L-1 in USPBR and aerobic MBR respectively, resulting in about 80.28% removal efficiency. These results indicate that anaerobic sequential USPBR/aerobic MBR reactor system seems to be an effective and promising system for complete azo dye biodegradation. (C) 2015 Elsevier B.V. All rights reserved.
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