PMID- 12449313
OWN - NLM
STAT- MEDLINE
DCOM- 20030605
LR  - 20191210
IS  - 0923-9820 (Print)
IS  - 0923-9820 (Linking)
VI  - 13
IP  - 2
DP  - 2002
TI  - Two-tank suspended growth process for accelerating the detoxification kinetics of 
      hydrocarbons requiring initial monooxygenation reactions.
PG  - 101-16
AB  - An experimental evaluation demonstrated that suspended growth systems operated in 
      a two-tank accelerator/aerator configuration significantly increased the overall 
      removal rates for phenol and 2,4-dichlorophenol (2,4-DCP), aromatic hydrocarbons 
      that require initial monooxygenations. The accelerator tank is a small volume 
      that receives the influent and recycled biomass. It has a high ratio of electron 
      donor (BOD) to electron acceptor (O2). Biomass in the accelerator should be 
      enriched in reduced nicotinamide adenine dinucleotide (NADH + H+) and have a very 
      high specific growth rate, conditions that should accelerate the kinetics of 
      monooxygenation reactions. For the more slowly degraded 2,4-DCP, the average 
      percentage removal increased from 74% to 93%, even though the volume of the 
      two-tank system was smaller than that of the one-tank system in most experiments. 
      The average volumetric and biomass-specific removal rates increased by 50% and 
      100%, respectively, in the two-tank system, compared to a one-tank system. The 
      greatest enhancement in 2,4-DCP removal occurred when the accelerator tank 
      comprised approximately 20% of the system volume. Biomass in the accelerator tank 
      was significantly enriched in NADH + H+ when its dissolved oxygen (DO) 
      concentration was below 0.25 mg/L, a situation having a high ratio of donor to 
      acceptor. The accelerator biomass had its highest NADH + H+ content for the 
      experiments that had the highest rate of 2,4-DCP removal. Biomass in the 
      accelerator also had a much higher specific growth rate than in the aerator or 
      the system overall, and the specific growth rate in the accelerator was inversely 
      correlated to the accelerator volume.
FAU - Dahlen, Elizabeth P
AU  - Dahlen EP
AD  - Exponent Failure Analysis Associates, Menlo Park, CA 94025, USA. 
      edahlen@exponent.com
FAU - Rittmann, Bruce E
AU  - Rittmann BE
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - Netherlands
TA  - Biodegradation
JT  - Biodegradation
JID - 9100834
RN  - 0 (Chlorophenols)
RN  - 0 (Hydrocarbons)
RN  - 0 (Industrial Waste)
RN  - 0 (Water Pollutants)
RN  - EC 1.- (Mixed Function Oxygenases)
RN  - R669TG1950 (2,4-dichlorophenol)
SB  - IM
MH  - Aerobiosis
MH  - Bacteria/enzymology/growth & development/metabolism
MH  - Biodegradation, Environmental
MH  - Chlorophenols/*metabolism
MH  - Equipment Design
MH  - Hydrocarbons/metabolism
MH  - Industrial Waste
MH  - Kinetics
MH  - Mixed Function Oxygenases/*metabolism
MH  - Waste Management/instrumentation/*methods
MH  - Water Pollutants/metabolism
EDAT- 2002/11/27 04:00
MHDA- 2003/06/06 05:00
CRDT- 2002/11/27 04:00
PHST- 2002/11/27 04:00 [pubmed]
PHST- 2003/06/06 05:00 [medline]
PHST- 2002/11/27 04:00 [entrez]
AID - 10.1023/a:1020461225393 [doi]
PST - ppublish
SO  - Biodegradation. 2002;13(2):101-16. doi: 10.1023/a:1020461225393.