Methane yield and microscopic observation as monitoring biofilm behaviour parameters, during start up phase of anaerobic inverse fluidized bed reactor

2012 ◽  
Vol 11 (78) ◽  
Author(s):  
Eric Houbron
Keyword(s):  
Fluidized Bed ◽  
Microscopic Observation ◽  
Fluidized Bed Reactor ◽  
Methane Yield ◽  
Start Up ◽  
Inverse Fluidized Bed

Biofilm development during the start-up of a sulfate-reducing down-flow fluidized bed reactor at different COD/SO42− ratios and HRT

2011 ◽  
Vol 64 (4) ◽  
pp. 910-916 ◽  
Author(s):  
E. Z. Piña-Salazar ◽  
F. J. Cervantes ◽  
M. Meraz ◽  
L. B. Celis
Keyword(s):  
Fluidized Bed ◽  
Granular Sludge ◽  
Fluidized Bed Reactor ◽  
Sulfate Reducing ◽  
Sulfate Removal ◽  
Start Up ◽  
Effective Removal ◽  
Suspended Biomass ◽  
High Sulfate ◽  
Biofilm Development

In sulfate-reducing reactors, it has been reported that the sulfate removal efficiency increases when the COD/SO42− ratio is increased. The start-up of a down-flow fluidized bed reactor constitutes an important step to establish a microbial community in the biofilm able to survive under the operational bioreactor conditions in order to achieve effective removal of both sulfate and organic matter. In this work the influence of COD/SO42− ratio and HRT in the development of a biofilm during reactor start-up (35 days) was studied. The reactor was inoculated with 1.6 g VSS/L of granular sludge, ground low density polyethylene was used as support material; the feed consisted of mineral medium at pH 5.5 containing 1 g COD/L (acetate:lactate, 70:30) and sodium sulfate. Four experiments were conducted at HRT of 1 or 2 days and COD/SO42− ratio of 0.67 or 2.5. The results obtained indicated that a COD/SO42− ratio of 2.5 and HRT 2 days allowed high sulfate and COD removal (66.1 and 69.8%, respectively), whereas maximum amount of attached biomass (1.9 g SVI/L support) and highest sulfate reducing biofilm activity (10.1 g COD-H2S/g VSS-d) was achieved at HRT of 1 day and at COD/sulfate ratios of 0.67 and 2.5, respectively, which suggests that suspended biomass also played a key role in the performance of the reactors.

CFD study of the hydrodynamics and biofilm growth effect of an anaerobic inverse fluidized bed reactor operating in the laminar regime

2020 ◽  
pp. 104674
Author(s):  
Jorge Ramírez-Muñoz ◽  
Román Guadarrama-Pérez ◽  
Alejandro Alvarado-Lassman ◽  
José J. Valencia-López ◽  
Valaur E. Márquez-Baños
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Growth Effect ◽  
Laminar Regime ◽  
Biofilm Growth ◽  
Inverse Fluidized Bed ◽  
Reactor Operating

Anaerobic treatment of low concentration waste water in an inverse fluidized bed reactor

2000 ◽  
Vol 41 (4-5) ◽  
pp. 245-251 ◽  
Author(s):  
P. Castilla ◽  
M. Meraz ◽  
O. Monroy ◽  
A. Noyola
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Specific Activity ◽  
Biomass Concentration ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Low Concentration ◽  
Inverse Fluidized Bed

Low concentration synthetic and municipal wastewaters were treated at HRT as short as 3 and 0.6 h respectively in an anaerobic inverse fluidized bed. Both bioreactors showed gas hold up due to the liquid downflow pattern of the prototype. The bioreactor operated at 3 h had a removal efficiency of 83%, specific activity of 4.5 kg CODremoved/kg IVS (d and the gas hold up varied from 23 to 55%. The reactor treating municipal wastewater had a removal efficiency of 44% when operating at 0.6 h, the specific activity was 4.2 kg CODremoved/kg IVS (d and no biogas was detected apparently because an important fraction was dissolved in the liquid phase. The biomass concentration was 13.8 and 1.1 kg IVS/m3 for synthetic and municipal wastewater and the SEM microphotographs showed a bacterial diversity for the first run and only cocci cells for the second run. The system does not remove suspended solids, so a polishing postreatment to improve water quality has to be implemented.

Population dynamics of biofilm development during start-up of a butyrate-degrading fluidized-bed reactor

1991 ◽  
Vol 36 (3) ◽  
pp. 404-409 ◽  
Author(s):  
Gerhard Zellner ◽  
Michael Geveke ◽  
Everly Conway de Macario ◽  
Hans Diekmann
Keyword(s):  
Population Dynamics ◽  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Start Up ◽  
Biofilm Development

Simultaneous sulfide and acetate oxidation under denitrifying conditions using an inverse fluidized bed reactor

2008 ◽  
Vol 83 (9) ◽  
pp. 1197-1203 ◽  
Author(s):  
Ricardo Beristain-Cardoso ◽  
Anne-Claire Texier ◽  
Reyes Sierra-Álvarez ◽  
Jim A Field ◽  
Elías Razo-Flores ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Acetate Oxidation ◽  
Inverse Fluidized Bed
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