Biohydrogen production in anaerobic fluidized bed reactors: Effect of support material and hydraulic retention time

The degradation of 2,4,6,-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetra-chlorophenol (2,3,4,6-TeCP) and pentachlorophenol (PCP) was evaluated in oxic fluidized-bed reactors. The pseudo-steady-state reactor operation at a hydraulic retention time of 5 hours and feed concentrations of 54 mg/l of 2,4,6-TCP and 64 mg/l of 2,3,4,6-TeCP resulted in stable and effective removal performances on these compounds. GC/MS results indicated over 99 % removal of both 2,4,6-TCP and 2,3,4,6-TeCP. However, PCP degradation at 74 mg/l feed concentration was neglible under these conditions. Further, a denitrifying biofilm was developed which was able to use 4-chlorophenol (4-CP) as the sole electron donor in denitrification reactions. No anoxie biofilm able to degrade 2,4-dichlorophenol (2,4-DCP) or PCP degradation in the presence of potassium nitrate could be developed.

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Longitudinal dispersion and biomass hold-up of anaerobic fluidized bed reactors

Water Science & Technology ◽

10.2166/wst.1996.0583 ◽

1996 ◽

Vol 34 (5-6) ◽

pp. 461-468 ◽

Cited By ~ 1

Author(s):

M. Turan ◽

I. Öztürk

Keyword(s):

Fluidized Bed ◽

Retention Time ◽

Fluidized Beds ◽

Hydraulic Retention Time ◽

Biomass Concentration ◽

Pulse Response ◽

Longitudinal Dispersion ◽

Fluidized Bed Reactors ◽

Biofilm Growth ◽

Biological Growth

Longitudinal dispersion in fluidized bed reactors was studied using pulse-response techniques for both clean and anaerobic-biofilm coated media. A large number of experimental data on the longitudinal dispersion and biofilm growth in the anaerobic fluidized bed reactors (AFBRs) were investigated. Some correlations applicable to fluidized beds were obtained for both the hydraulic retention time and the biomass concentration versus the ratio Pe/Re. The biomass concentration tends to zero for a critical retention time in AFBRs. The biological growth in the bed causes an increase of Pe number.

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Effect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactors

Journal of Chemical Technology & Biotechnology ◽

10.1002/jctb.4296 ◽

2014 ◽

Vol 90 (1) ◽

pp. 120-129 ◽

Cited By ~ 11

Author(s):

Denys Kristalia Villa Gomez ◽

Anne Marie Enright ◽

Eki Listya Rini ◽

Audrey Buttice ◽

Herman Kramer ◽

...

Keyword(s):

Fluidized Bed ◽

Retention Time ◽

Hydraulic Retention Time ◽

Fluidized Bed Reactors ◽

Sulfate Reducing ◽

Metal Precipitation ◽

Inverse Fluidized Bed

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Influence of Seeding Conditions on Initial Biofilm Development during the Startup of Anaerobic Fluidized Bed Reactors

Water Science & Technology ◽

10.2166/wst.1989.0219 ◽

1989 ◽

Vol 21 (4-5) ◽

pp. 157-165 ◽

Cited By ~ 2

Author(s):

F. Ehlinger ◽

J. M. Audic ◽

G. M. Faup

Keyword(s):

Fluidized Bed ◽

Future Development ◽

Protein Concentration ◽

Specific Activity ◽

Fluidized Bed Reactor ◽

Fluidized Bed Reactors ◽

Support Material ◽

Biofilm Development ◽

Initial Biofilm

The characterization of the biofilm of an anaerobic fluidized-bed reactor was completed under standard conditions. The distribution of the fixed protein concentration depended on the level in the reactor. The protein concentration reached 1520 µg.g−1 of support at the top of the reactor and only 1200 µg.g−1 at the bottom after 504 hours of operation but the specific activity of the biofilm was 33×10−4 µM acetate.h−1.mg−1 proteins at the bottom and only 26×10−4 µM.h−1.mg−1 at the top. The efficiency of a fluidized bed reactor and the composition of the biofilm changed with an increase of the pH from 7 to 8.5 during the seeding of the support material. Future development of the biofilm and the specific activity of the support were affected.

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