Journal
WATER RESEARCH
Volume 60, Issue -, Pages 182-196Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.04.027
Keywords
Derivative cyclic voltammetry (DCV); Extracellular electron transfer (EET); Azo reductase; Dehydrogenase activity; Sodium dodecyl sulphate-poly; acrylamide gel electrophoresis; (SDS-PAGE); Sequencing batch reactor (SBR)
Funding
- Department of Biotechnology (DBT), Government of India [BT/PR11070/BCE/08/693/2008]
- Council of Scientific and Industrial Research Organisation (CSIR) in the form of XII five year network projects (SETCA) [CSC-0113]
- CSIR
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Effect of dye (C.I.Acid Black 10B) load-shock was comparatively evaluated in biofilm (selfimmobilized) and suspended growth systems operated in periodic discontinuous batch mode (PDBR, anoxic-aerobic-anoxic) was investigated. At higher dye load (1250 mg dye/l), biofilm system showed relatively higher dye (74.5%) and COD (46%) removal efficiencies than the corresponding suspended mode operation (dye/COD removal efficiency, 42%/65%). Increment in dye load showed increment in azo reductase and dehydrogenase enzyme activities. Voltammograms (cyclic) showed higher reduction currents (RC) with increment in dye load specifically in biofilm system. Derivative cyclic voltammograms analysis depicted the involvement of mediators (NAD (+), FAD(+), etc.) which presumably played a major role in electron transport chain and dye degradation. Disappearance of peak (1612 cm(-1)) specific to azo group in FTIR spectrum, at higher loading rate in both the systems indicates the non-inhibitory and robust nature of PDBR operation. (C) 2014 Elsevier Ltd. All rights reserved.
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