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- W2003391970 abstract "Abstract The biological wastewater treatment was investigated in the inverse fluidised bed reactor (IFBR) in which polypropylene particles of density 910 kg/m 3 were fluidised by an upward flow of gas. Measurements of chemical oxygen demand (COD) versus residence time t were performed for various ratios of settled bed volume to reactor volume ( V b / V R ) and air velocities u g . The largest COD removal was attained when the reactor was operated at the ratio ( V b / V R ) m = 0.55 and an air velocity u gm = 0.024 m/s. Under these conditions, the value of COD was practically at steady state for times greater than 30 h. Thus, these values of ( V b / V R ) m , u gm and t can be considered as the optimal operating parameters for a reactor when used in treatment of industrial wastewaters. A decrease in COD from 36,650 to 1950 mg/l, i.e. a 95% COD reduction, was achieved when the reactor was optimally controlled at ( V b / V R ) m = 0.55, u gm = 0.024 m/s and t = 30 h. The pH was controlled in the range 6.5–7.0 and the temperature was maintained at 28–30 °C. The biomass loading was successfully controlled in an IFBR with support particles whose matrix particle density was smaller than that of liquid. The steady-state biomass loading depended on the ratio ( V b / V R ) and an air velocity u g . In the culture conducted after switching from the batch to the continuous operation, the steady-state biomass loading was attained after approximately 2-week operation. In the cultures conducted after change in ( V b / V R ) at a set u g , the steady-state mass of cells grown on the particles was achieved after about 6-day operation. For a set ratio ( V b / V R ), the biomass loading depended on u g . With change in u g at a set ( V b / V R ), the new steady-state biomass loading occurred after the culturing for about 2 days." @default.
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- W2003391970 date "2009-07-15" @default.
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- W2003391970 title "Biological wastewater treatment in the inverse fluidised bed reactor" @default.
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- W2003391970 doi "https://doi.org/10.1016/j.cej.2008.12.021" @default.
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