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KMID : 1024519930020040331
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Journal of the Environmental Sciences
1993 Volume.2 No. 4 p.331 ~ p.336
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A Study on Aerobic Fluidized-Bed Biofilm Reactor for Treating Industrial Wastewaters(III) -Mathematical model for organic removal-
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Ahn Kab-Hwan
Park Sang-Joon
Song Seung-Koo
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Abstract
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A mathematical model for organic removal efficiency was investigated in a fluidized bed biofilm reactor by changing the feed flow rate, the residence time and the recycle flow rate. In batch experiment, organic removal could be assumed as first order and an intrinsic first order rate constant(k1) was found at influent COD range of 3040 - 6620 mg/L. In continuous experiment, at the condition of the influent COD, 3040 mg/L, the superficial upflow velocity, 0.47 cm/sec, the biofilm thickness 336 and the biofilm dry density 0.091 g/mL, the calculated COD removal efficiency from the mathematical model gave 60% which was very close to the observed value of 66 %. As the feed flow rate was increased, the COD removal efficiency was sharply decreased and at constant feed flow rate, the COD removal efficiency was decreased also as the residence time being decreased.
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KEYWORD
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fluidized-bed biofilm reactor, organic removal, mathematical model
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