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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 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 results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate.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.


Effect of the upflow velocity and organic loading rate on reactor performance.
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Fig3: Effect of the upflow velocity and organic loading rate on reactor performance.

Mentions: Figure 3 and Table 4 show the effect of the OLR on the COD removal efficiency (E) and COD effluent in reactor throughout the operation time for the reactor studied. As shown, during stage 1, OLR in AFBR was kept at around 9.4 g COD L.d−1 with the feed COD concentration of 18,000 ± 300 mg L−1 and HRT around 48 h, the reactor performance was investigate for 0.5, 0.75 and 1 m min−1 upflow velocities. At steady state, with 0.5, 0.75 and 1 m min−1 upflow velocities, the reactor performances in stage 1 were 89.3, 96.6 and 95 percent, respectively. At stage 2, the HRT of reactor was decreased from 48 h to 40 h and OLR in Anaerobic Fluidized Bed Reactor increased from 9.4 to 10.8 g COD L.d−1 and feed COD concentration was as same as the stage 1, the reactor performance dropped to 86, 95.2 and 94 percent, respectively. As can be seen, in the stage 1 and 2, in the second set, 0.75 m min−1 upflow velocity had more removal efficiency than other upflow velocities. Also In other stages, in the second set, 0.75 m min−1 upflow velocity had more removal efficiency than other upflow velocities. In the stage 5, the OLR was further increased to 24.2 g COD L.d−1. By decreasing HRT to 18 h, reactor performance dropped to 63.4, 79.6 and 73.4 percent, respectively. The average COD concentration in the effluent of the three sets at a loading rate of 9.4 g COD L.d−1 was 2020, 630 and 940 mg L−1, respectively. Then, the average COD concentration in the effluent of the three sets at a loading rate of 24.2 g COD L.d−1 increased gradually to 6515, 3666 and 4835 mg L−1, respectively.Figure 3


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)

Effect of the upflow velocity and organic loading rate on reactor performance.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig3: Effect of the upflow velocity and organic loading rate on reactor performance.
Mentions: Figure 3 and Table 4 show the effect of the OLR on the COD removal efficiency (E) and COD effluent in reactor throughout the operation time for the reactor studied. As shown, during stage 1, OLR in AFBR was kept at around 9.4 g COD L.d−1 with the feed COD concentration of 18,000 ± 300 mg L−1 and HRT around 48 h, the reactor performance was investigate for 0.5, 0.75 and 1 m min−1 upflow velocities. At steady state, with 0.5, 0.75 and 1 m min−1 upflow velocities, the reactor performances in stage 1 were 89.3, 96.6 and 95 percent, respectively. At stage 2, the HRT of reactor was decreased from 48 h to 40 h and OLR in Anaerobic Fluidized Bed Reactor increased from 9.4 to 10.8 g COD L.d−1 and feed COD concentration was as same as the stage 1, the reactor performance dropped to 86, 95.2 and 94 percent, respectively. As can be seen, in the stage 1 and 2, in the second set, 0.75 m min−1 upflow velocity had more removal efficiency than other upflow velocities. Also In other stages, in the second set, 0.75 m min−1 upflow velocity had more removal efficiency than other upflow velocities. In the stage 5, the OLR was further increased to 24.2 g COD L.d−1. By decreasing HRT to 18 h, reactor performance dropped to 63.4, 79.6 and 73.4 percent, respectively. The average COD concentration in the effluent of the three sets at a loading rate of 9.4 g COD L.d−1 was 2020, 630 and 940 mg L−1, respectively. Then, the average COD concentration in the effluent of the three sets at a loading rate of 24.2 g COD L.d−1 increased gradually to 6515, 3666 and 4835 mg L−1, respectively.Figure 3

Bottom Line: 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 results demonstrated that the AFBR system is capable of handling an exceptionally high organic loading rate.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.