PMID- 11601541
OWN - NLM
STAT- MEDLINE
DCOM- 20020311
LR  - 20191105
IS  - 0960-8524 (Print)
IS  - 0960-8524 (Linking)
VI  - 80
IP  - 3
DP  - 2001 Dec
TI  - Biotransformation of nitrophenols in upflow anaerobic sludge blanket reactors.
PG  - 179-86
AB  - Four identical bench-scale upflow anaerobic sludge blanket (UASB) reactors, R1, 
      R2, R3 and R4, were used to assess nitrophenols degradation at four different 
      hydraulic retention times (HRT). Reactor R1 was used as control, whereas R2, R3, 
      and R4 were fed with 2-nitrophenol (2-NP), 4-nitrophenol (4-NP), and 
      2,4-dinitrophenol (2,4-DNP), respectively. The concentration of each nitrophenol 
      was gradually varied from 2 to 30 mg/l during acclimation. After acclimation 
      reactors were operated under steady-state conditions at four different HRTs--30, 
      24, 18, and 12 h, to study its effect on the removal of nitrophenols. Overall 
      removal of 2-NP and 4-NP was always more than 99% but 2,4-DNP removal decreased 
      from 96% to 89.7% as HRT was lowered from 30 to 12 h. 2-Aminophenol (2-AP), 
      4-aminophenol (4-AP) and 2-amino,4-nitrophenol (2-A,4-NP) were found to be the 
      major intermediates during the degradation of 2-NP, 4-NP and 2,4-DNP, 
      respectively. Out of the total input of nitrophenolic concentration (30 mg/l), on 
      molar basis, about 41.248.4% of 2-NP, 59.4-68% of 4-NP, 30-26.6% of 2,4-DNP was 
      recovered in the form of their respective amino derivatives at 30-12 h HRT. COD 
      removal was 98-89%, 97-56%, 97-52%, and 94-46% at 30-12 h HRT for R1, R2, R3 and 
      R4, respectively. Average cell growth was observed to be 0.15 g volatile 
      suspended solid (VSS) per g COD consumed. Methanogenic inhibition was observed at 
      lower HRTs (18 and 12 h), however denitrification was always more than 99% with 
      non-detectable level of nitrite. The granules developed inside the reactors were 
      black in color and their average size varied between 1.9 and 2.1 mm.
FAU - Karim, K
AU  - Karim K
AD  - Centre for Environmental Science and Engineering, Indian Institute of Technology, 
      Bombay. karim@cc.iitb.ac.in
FAU - Gupta, S K
AU  - Gupta SK
LA  - eng
PT  - Journal Article
PL  - England
TA  - Bioresour Technol
JT  - Bioresource technology
JID - 9889523
RN  - 0 (Nitrates)
RN  - 0 (Nitrophenols)
RN  - 0 (Sewage)
RN  - N762921K75 (Nitrogen)
RN  - OP0UW79H66 (Methane)
SB  - IM
MH  - Biomass
MH  - *Bioreactors
MH  - Methane/chemistry
MH  - Microscopy, Electron, Scanning
MH  - Nitrates/chemistry
MH  - Nitrogen
MH  - Nitrophenols/*chemistry
MH  - *Sewage
MH  - Time Factors
MH  - Waste Disposal, Fluid/*methods
EDAT- 2001/10/17 10:00
MHDA- 2002/03/12 10:01
CRDT- 2001/10/17 10:00
PHST- 2001/10/17 10:00 [pubmed]
PHST- 2002/03/12 10:01 [medline]
PHST- 2001/10/17 10:00 [entrez]
AID - S0960-8524(01)00092-X [pii]
AID - 10.1016/s0960-8524(01)00092-x [doi]
PST - ppublish
SO  - Bioresour Technol. 2001 Dec;80(3):179-86. doi: 10.1016/s0960-8524(01)00092-x.