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Continuous biotransformation and removal of nitrophenols under denitrifying conditions

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Title Continuous biotransformation and removal of nitrophenols under denitrifying conditions
 
Creator KARIM, K
GUPTA, SK
 
Subject uasb reactors
waste-water
denitrification
biodegradation
degradation
carbon
system
biotransformation
cod/no3- -n ratio
denitrification
methanogenesis
nitrophenol
uasb
 
Description 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 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-23T20:37:11Z
2011-12-26T12:56:35Z
2011-12-27T05:45:33Z
2011-08-23T20:37:11Z
2011-12-26T12:56:35Z
2011-12-27T05:45:33Z
2003
 
Type Article
 
Identifier WATER RESEARCH, 37(12), 2953-2959
0043-1354
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
 
Language en