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Influence of upflow velocity on performance and biofilm characteristics of Anaerobic Fluidized Bed Reactor (AFBR) in treating high-strength wastewater.

Jaafari J, Mesdaghinia A, Nabizadeh R, Hoseini M, Kamani H, Mahvi AH - J Environ Health Sci Eng (2014)

Bottom Line: The results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate.The average biomass concentration per unit volume of the AFBR (as gVSSatt L(-1) expended bed) decreased with the increase of upflow velocity in the range of 0.5-1 m min(-1) at all applied organic loading rates.The bed porosity increased from the bottom to the top of the reactor.

View Article: PubMed Central - PubMed

Affiliation: School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

ABSTRACT
One of the key parameters in Fluidized Bed reactors is the control of biofilm thickness and configuration. The effect of upflow velocity on performance and biofilm characteristics of an Anaerobic Fluidized Bed Reactor was studied in treating Currant wastewater at various loading rates. The reactor used this study was made of a plexiglass column being 60 mm diameter, 140 cm height, and a volume of 3.95 L. The results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate. At organic loading rates of 9.4 to 24.2 (kg COD m(-3)) at steady state, reactor performances with upflow velocities of 0.5, 0.75 and 1 (m min(-1)) were 89.3- 63.4, 96.9 - 79.6 and 95 - 73.4 percent, respectively. The average biomass concentration per unit volume of the AFBR (as gVSSatt L(-1) expended bed) decreased with the increase of upflow velocity in the range of 0.5-1 m min(-1) at all applied organic loading rates. The total biomass in the reactor increased with increases in the organic loading rate. The peak biomass concentration per unit volume (as gVSSatt L(-1) expended bed) was observed at the bottom part of the reactor, then it droped off slowly towards the top. The biofilm thickness increased from the bottom to the top of the reactor representing a stratification of the media in the AFBR. The bed porosity increased from the bottom to the top of the reactor.

No MeSH data available.


Profiles of biomass concentration at different upflow velocities.
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Fig6: Profiles of biomass concentration at different upflow velocities.

Mentions: Figures 6, 7, and 8 show typical profiles of biomass concentration, biofilm thickness and particle density along the AFBR, respectively. As shown in Figure 6, as a result of the increase in the bed porosity along the reactor from the bottom to the top. In this figure, it was observed that biomass concentration as bio-particles per unit volume of the AFBR decreased along the reactor from the bottom to the top. As shown in Figure 7, biofilm thickness increased from the bottom to the top of the reactor representing a stratification of the bio-particle in the AFBR. Stratification is a consequence of the variability of the bio-particle densities in the reactor. Also, the unequal colonization of the substratum can be one of the causes of the variability of the bio-particle densities in the reactor.Figure 6


Influence of upflow velocity on performance and biofilm characteristics of Anaerobic Fluidized Bed Reactor (AFBR) in treating high-strength wastewater.

Jaafari J, Mesdaghinia A, Nabizadeh R, Hoseini M, Kamani H, Mahvi AH - J Environ Health Sci Eng (2014)

Profiles of biomass concentration at different upflow velocities.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4256795&req=5

Fig6: Profiles of biomass concentration at different upflow velocities.
Mentions: Figures 6, 7, and 8 show typical profiles of biomass concentration, biofilm thickness and particle density along the AFBR, respectively. As shown in Figure 6, as a result of the increase in the bed porosity along the reactor from the bottom to the top. In this figure, it was observed that biomass concentration as bio-particles per unit volume of the AFBR decreased along the reactor from the bottom to the top. As shown in Figure 7, biofilm thickness increased from the bottom to the top of the reactor representing a stratification of the bio-particle in the AFBR. Stratification is a consequence of the variability of the bio-particle densities in the reactor. Also, the unequal colonization of the substratum can be one of the causes of the variability of the bio-particle densities in the reactor.Figure 6

Bottom Line: The results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate.The average biomass concentration per unit volume of the AFBR (as gVSSatt L(-1) expended bed) decreased with the increase of upflow velocity in the range of 0.5-1 m min(-1) at all applied organic loading rates.The bed porosity increased from the bottom to the top of the reactor.

View Article: PubMed Central - PubMed

Affiliation: School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

ABSTRACT
One of the key parameters in Fluidized Bed reactors is the control of biofilm thickness and configuration. The effect of upflow velocity on performance and biofilm characteristics of an Anaerobic Fluidized Bed Reactor was studied in treating Currant wastewater at various loading rates. The reactor used this study was made of a plexiglass column being 60 mm diameter, 140 cm height, and a volume of 3.95 L. The results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate. At organic loading rates of 9.4 to 24.2 (kg COD m(-3)) at steady state, reactor performances with upflow velocities of 0.5, 0.75 and 1 (m min(-1)) were 89.3- 63.4, 96.9 - 79.6 and 95 - 73.4 percent, respectively. The average biomass concentration per unit volume of the AFBR (as gVSSatt L(-1) expended bed) decreased with the increase of upflow velocity in the range of 0.5-1 m min(-1) at all applied organic loading rates. The total biomass in the reactor increased with increases in the organic loading rate. The peak biomass concentration per unit volume (as gVSSatt L(-1) expended bed) was observed at the bottom part of the reactor, then it droped off slowly towards the top. The biofilm thickness increased from the bottom to the top of the reactor representing a stratification of the media in the AFBR. The bed porosity increased from the bottom to the top of the reactor.

No MeSH data available.