Mechanism of Semifluidized Bed Bioreactor for Biological Phenol Degradation : Final Report

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Title: Mechanism of Semifluidized Bed Bioreactor for Biological Phenol Degradation : Final Report
Creators: Fan, Liang-Shih
Contributors: Ohio State University. Water Resources Center
Subjects (LCSH): Phenols -- Biodegradation
Coal gasification -- By-products
Coal liquefaction -- By-products
Fluidized-bed furnaces
Issue Date: 1983
Publisher: Ohio State University. Water Resources Center
Series/Report no.: Project completion report (Ohio State University. Water Resources Center) ; no. 714438
Abstract: The kinetics of biological phenol degradation and the performance of the bacteria in a packed bed and semifluidized bed reactor were investigated in this research project. Batch studies at three temperatures, 24°C, 35°C, and 45°C, were undertaken to determine the optimum operating temperature. Sewage bacteria acclimated to high phenol concentrations at each temperature were used in these studies. It was determined that the optimum operating temperature was dependent on the phenol concentration with a rule-of-thumb operating temperature found to be around 35°C. The bacteria were seeded onto various types of packing material for use in the semifluidized and packed bed studies. In the semifluidized bed, the flow of gas and liquid was countercurrent. From the semifluidized bed studies a decrease in the liquid flowrate from 1500 ml/min to 100 ml/min increased the phenol degradation by approximately 10 percent. From the packed-bed studies an increase of air flowrate from 0 SCFH to 7 SCFH increased the amount of phenol degraded by approximately 4 percent. The bacteria appeared to attach better to the polypropylene packing used in the packed- bed runs than to the charcoal and polyethylene packing used in the semifluidized-bed runs. Investigation was also extended to cover the hydrodynamic behavior of the semifluidized bed. Separate experiments were conducted to study the hydrodynamic behavior of countercurrent flow of gas and liquid in a packed bed. This part of the study simulates the packed section of the semifluidized bed. A mathematical model is developed to account for the friction factor between the liquid and solid in the packed bed. The gas hold-up and friction factor of the packed bed were analyzed and empirically correlated. A computational procedure was developed which allows a reasonably accurate prediction of the pressure drop in the semifluidized bed.
Other Identifiers: OCLC: #11141586 (print)
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