Characteristics of simultaneous utilization of oxygen and substrate in a three-phase fluidized bed bioreactor.
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概要
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A three-phase fluidized bed bioreactor was employed for a biological treatment process of phenolic wastewater. The characteristics of simultaneous utilization of oxygen and substrate (phenol) in the bioreactor were evaluated.<BR>In the experiments, activated carbon BAC and CB ball were utilized as media. Air was used for aeration.<BR>The model discussed in this paper includes the following steps:<BR>(1) Gas–liquid mass transfer of oxygen<BR>(2) Liquid–biofilm interfacial mass transfer of oxygen and substrate<BR>(3) Intrabiofilm mass transfer and simultaneous biological reaction of oxygen and substrate<BR>Two cases, biological substrate removal as rate-determining step and oxygen absorption as rate-defermining step, were evaluated.<BR>Within the range of experimental conditions studied, biooxidation of phenol was simply evaluated by treating substrate utilization as zero-order reaction. The experimental results of phenol removal were well explained by an equation based on the assumption of oxygen absorption as the rate-determining step. It was found that biological reaction did not act as the rate-determining step in the case of superficial air velocity up to 1.0 cm/s.<BR>The volumetric phenol removal rate becomes more than 8 kg-phenol/(m<SUP>3</SUP>-bed·d) by increase of oxygen supply in the three-phase fluidized bed bioreactor.
- The Society of Chemical Engineers, Japanの論文
著者
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Hirata Akira
Department Of Chemical Engineering Waseda University
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Umezawa Hiroaki
Department of Chemical Engineering, Waseda University
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Hosaka Yukihisa
Department of Chemical Engineering, Waseda University
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