PMID- 16586508
OWN - NLM
STAT- MEDLINE
DCOM- 20060905
LR  - 20131121
IS  - 0006-3592 (Print)
IS  - 0006-3592 (Linking)
VI  - 94
IP  - 5
DP  - 2006 Aug 5
TI  - Impact of long-term partial aeration on the removal of 2,4,6-trichlorophenol in 
      an initially methanogenic fluidized bed bioreactor.
PG  - 949-60
AB  - A fluidized bed bioreactor (FBBR) was operated for more than 1000 days under two 
      regimes, Methanogenic (M) and Methanogenic-Aerobic (M-A), to remove 
      2,4,6-trichlorophenol (TCP) and phenol (Phe) from a synthetic wastewater, 
      containing different amounts of TCP and Phe, using different aeration flow-rates 
      (0, 2.13, and 1.06 NL O(2)/L.day). M conditions (80:20 mg/L of TCP:Phe, 0 NL 
      O(2)/L.day) showed similar TCP and Phe removal (>95%). Nevertheless accumulation 
      of 4-chlorophenol (4CP) up to 16 mg/L and Phe up to 4 mg/L was observed, while in 
      M-A conditions (80:20 mg/L of TCP:Phe, 2.13 NL O(2)/L.day) TCP and Phe removal 
      achieved 99.9(+)% and after 70 days no accumulation of intermediates were 
      detected. The increase of TCP and Phe in the influent under M-A conditions from 
      80:20 to 120:30 mg/L of TCP:Phe did not negatively affect the removal of TCP, 
      intermediates and Phe; in fact, they were similar to those in previous M-A 
      conditions. The decrease in the oxygen flow rate from 2.13 to 1.06 NL O(2)/L.day 
      had no negative effect on pollutant removals, which were as high as in previous 
      two M-A conditions. The specific methanogenic activity of bioparticles of the 
      fluidized bed decreased with long-term partial aeration, starting from 1.097 mmol 
      CH(4)/h.g(TKN) in the M regime (day 60) to <0.02 mmolCH(4)/h.g(TKN) at day 1050, 
      suggesting aerobic regime in the bioreactor rather than an M-A regime. In 
      conclusion, complete removal of TCP and less chlorinated intermediates could be 
      achieved in an initially methanogenic FBBR under conditions of partial aeration, 
      although long-term operation seemed to negatively affect the methanogenic 
      activity of biomass. It is also likely that after extended aeration the microbial 
      community was finally enriched with strains with the ability to attack 2,4,6-TCP 
      under aerobic conditions. This report represents the first evidence of a long 
      exposure to oxygen of an anaerobic microbial consortium that efficiently remove 
      TCP.
CI  - (c) 2006 Wiley Periodicals, Inc.
FAU - Garibay-Orijel, Claudio
AU  - Garibay-Orijel C
AD  - Department Biotechnology and Bioengineering, CINVESTAV-IPN, Mexico.
FAU - Hoyo-Vadillo, Carlos
AU  - Hoyo-Vadillo C
FAU - Ponce-Noyola, Teresa
AU  - Ponce-Noyola T
FAU - Garcia-Mena, Jaime
AU  - Garcia-Mena J
FAU - Poggi-Varaldo, Hector Mario
AU  - Poggi-Varaldo HM
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Biotechnol Bioeng
JT  - Biotechnology and bioengineering
JID - 7502021
RN  - 0 (Chlorophenols)
RN  - 0 (Sewage)
RN  - 0 (Water Pollutants, Chemical)
RN  - MHS8C5BAUZ (2,4,6-trichlorophenol)
RN  - OP0UW79H66 (Methane)
SB  - IM
MH  - Air
MH  - Bioreactors/*microbiology
MH  - Chlorophenols/isolation & purification/*metabolism
MH  - Computer Simulation
MH  - Euryarchaeota/*growth & development/*metabolism
MH  - Methane/*metabolism
MH  - Microfluidics/methods
MH  - *Models, Biological
MH  - Sewage/*microbiology
MH  - Time Factors
MH  - Water Pollutants, Chemical/isolation & purification/metabolism
MH  - Water Purification/methods
EDAT- 2006/04/06 09:00
MHDA- 2006/09/06 09:00
CRDT- 2006/04/06 09:00
PHST- 2006/04/06 09:00 [pubmed]
PHST- 2006/09/06 09:00 [medline]
PHST- 2006/04/06 09:00 [entrez]
AID - 10.1002/bit.20918 [doi]
PST - ppublish
SO  - Biotechnol Bioeng. 2006 Aug 5;94(5):949-60. doi: 10.1002/bit.20918.