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Effect of COD/NO(3)(-)-N ratio on the performance of a hybrid UASB reactor treating phenolic wastewater

DSpace at IIT Bombay

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Title Effect of COD/NO(3)(-)-N ratio on the performance of a hybrid UASB reactor treating phenolic wastewater
 
Creator RAMAKRISHNAN, A
GUPTA, SK
 
Subject sludge blanket
biodegradation
removal
filter
phenolics
biodegradation
coal wastewater
c/n ratio
methane
 
Description The effect of COD/O(3)(-)-N ratio on the biodegradation of complex phenolic mixture was studied in bench scale hybrid upflow anaerobic sludge blanket (HUASB) reactors. HUASB reactor is a combination of a UASB unit at the lower part and an anaerobic fixed film at the upper end. The aim of this study was to evaluate the biodegradability of phenolic mixture (from synthetic coal wastewater) as the only carbon and energy source in continuous experiments using nitrate as the final electron acceptor. Synthetic coal wastewater contained phenol (490 mg/L); m-,o-,p-cresols (123.0 mg/L, 58.6 mg/L, 42 mg/L); 2,4-, 2,5-, 3,4- and 3,5 dimethyl phenols (6.3 rng/L, 6.3 mg/L, 4.4 mg/L and 21.3 mg/L) as major phenolic compounds representing the complex phenolic mixture. Nitrate nitrogen loading was increased from 0.11 g/m(3)/d to 0.5 g/m(3)/d in order to keep COD/NO(3)(-)-N ratio as 20.1, 14.85, 9.9, 6.36 and 4.45. An input phenolics concentration of 752 mg/L and hydraulic retention time (HRT) of 24 h was maintained through out the study. Removal of phenolic mixture was found to increase with the lowering of COD/NO(3)(-)-N ratio. Maximum phenolics removal of 98% was achieved at a COD/NO(3)(-)-N ratio of 6.36. However, phenolics removal got adversely affected when COD/NO(3)(-)-N ratio was reduced below 6.36. A nitrogen production efficiency of 78% was obtained according to nitrate consumption. Simultaneous denitrification and methanogenesis was observed in all the reactors throughout the study, demonstrating that denitrification is a feasible alternative for the treatment of coal wastewater. Granules degrading complex phenolic mixture were of diameter 1.6-2.25 mm.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-10-23T00:42:21Z
2011-12-15T09:10:58Z
2011-10-23T00:42:21Z
2011-12-15T09:10:58Z
2008
 
Type Article; Proceedings Paper
 
Identifier DESALINATION,232,128-138
0011-9164
http://dx.doi.org/10.1016/j.desal.2007.09.016
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15007
http://hdl.handle.net/100/1764
 
Source 2nd Biennial Symposium on Emerging Trends in Separation Science and Technology (SESTEC 2006),Mumbai, INDIA,SEP 29-OCT 01, 2006
 
Language English