Author/Authors :
Jaafari، Jalil نويسنده 1School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Mesdaghinia، Alireza نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2National Institute of Health Research, Ministry of Health, Tehran, Iran , , Nabizadeh، Ramin نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Hoseini، Mohammad نويسنده 1Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , kamani، Hossein نويسنده Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran , , Mahvi، Amir Hossein نويسنده Department of Environmental Health Engineering, School of Health; National Institute of Health Research; Center for Solid Waste Research, Institute fo ,
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.
