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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/10637

Title: Continuous biotransformation and removal of nitrophenols under denitrifying conditions
Authors: KARIM, K
GUPTA, SK
Keywords: uasb reactors
waste-water
denitrification
biodegradation
degradation
carbon
system
Issue Date: 2003
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: WATER RESEARCH, 37(12), 2953-2959
Abstract: The effect of COD/NO3--N ratio on the biotransformation and removal of 2-nitrophenol (2-NP), 4-nitrophenol (4-NP), and 2,4-dinitrophenol (2,4-DNP) was studied in bench scale upflow anaerobic sludge blanket (UASB) reactors. Sodium acetate and sodium nitrate were used as electron donor (substrate) and electron acceptor, respectively. Nitrate nitrogen loading was increased from 0.098 to 0.6 kg/m(3) d in order to keep COD/NO3--N ratio as 20.8, 14.3, 9.8, 5.0, 4.0 and 3.33. Throughout the study, input nitrophenolic concentration and hydraulic retention time (HRT) were kept constant as 30 mg/l and 24 h, respectively. 2-Aminophenol (2-AP), 4-aminophenol (4-AP) and 2-amino,4,-nitrophenol (2-A,4-NP) were found as the major intermediate metabolite of 2-NP, 4-NP and 2,4-DNP, respectively. Removal of all the three nitrophenols increased with lowering of COD/NO3--N ratio. However, nitrophenols removal got adversely affected when COD/NO3--N ratio was reduced below 5. Maximum removal achieved were 91.63%, 90.17% and 86.10% for 2-NP, 4-NP and 2,4-DNP, respectively at a COD/NO3--N ratio of 5. Simultaneous denitrification and methanogenesis was observed in all the reactors throughout the study. (C) 2003 . .
URI: http://dx.doi.org/10.1016/S0043-1354(03)00073-3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10637
http://hdl.handle.net/10054/10637
ISSN: 0043-1354
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