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Effect of shock and mixed nitrophenolic loadings on the performance of UASB reactors

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Field Value
 
Title Effect of shock and mixed nitrophenolic loadings on the performance of UASB reactors
 
Creator KARIM, K
GUPTA, SK
 
Subject sludge
transformation
biotransformation
biodegradation
oxidation
toxicity
removal
water
 
Description The effect of nitrophenolic shock loads on the performance of three bench-scale upflow anaerobic sludge blanket (UASB) reactors was studied using synthetic wastewater. Reactors R1, R2 and R3 were fed with 30mg/L concentration of 2-nitrophenol (2-NP), 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), respectively, along with methanol (COD = 2000 mg/ L), sodium nitrate (NO3--N=200mg/L), and other nutrients. The reactors were in continuous operation for more than 2 years before the shock loading study was performed. Five nitrophenolic shock loadings of 45, 60, 75, 90 and 120mg/Ld were administrated by increasing the influent nitrophenolic concentration to 45, 60, 75, 90 and 120mg/L, respectively, while keeping hydraulic retention time as 24h. The shocks were given continuously for a period of 4 days before switching back to normal nitrophenolic loading (30mg/Ld). The reactors were allowed to recover to normal performance level before administrating the next nitrophenolic shock load. The study showed that the nitrophenolic shock load of as high as 120mg/Ld did not affect the reactors performance irreversibly. After resuming the normal nitrophenolic loading, it took almost 3-18 days for the reactors to recover from the shock effect. The study was further extended to assess the maximum possible mixed nitrophenolic loading (2NP:4NP:2,4:DNP = 1:1:1) to which 2,4-DNP acclimated granular sludge containing reactor (R3) can be exposed without hampering the reactor (R3) performance irreversibly. The reactor was able to achieve pseudo-steady-state at a mixed nitrophenolic loading of 180 mg/L d with more than 90% removal of all the three nitrophenols, but failed at a mixed nitrophenolic loading of 225 mg/L d. (c) 2006
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-24T04:44:48Z
2011-12-26T12:56:44Z
2011-12-27T05:45:56Z
2011-08-24T04:44:48Z
2011-12-26T12:56:44Z
2011-12-27T05:45:56Z
2006
 
Type Article
 
Identifier WATER RESEARCH, 40(5), 935-942
0043-1354
http://dx.doi.org/10.1016/j.watres.2005.12.030
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10761
http://hdl.handle.net/10054/10761
 
Language en