A kinetic study on anaerobic reduction of sulphate, part II: incorporation of temperature effects in the kinetic model |
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Authors: | Shehnaaz Moosa Mehdi Nemati |
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Affiliation: | a Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa b Department of Chemical Engineering, University of Saskatchewan, Saskatoon, SK, Canada S7N 5C5 |
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Abstract: | The effects of temperature on the kinetics of anaerobic sulphate reduction were studied in continuous bioreactors using acetate as an electron donor. Across the range of temperatures applied from 20 to , the increasing of volumetric loading rate up to 0.08 to resulted in a linear increase in reduction rate of sulphate. The increasing reaction rate showed a lower dependence on volumetric loading rate in the range 0.1- . Further increase in volumetric loading rate above was accompanied by wash out of bacterial cells and a sharp decrease in reaction rate. Despite a similar pattern for dependency of reaction rate on volumetric loading at all temperatures tested, the magnitude of reaction rate was influenced by temperature, with a maximum rate of observed at . The effect of temperature on maximum specific growth rate (μmax) and bacterial yield was insignificant. The values of maximum specific growth rate and yield were and 0.56-0.60 kg bacteria ( ), respectively. The decay coefficient (kd) and apparent saturation constant ( ) were both temperature dependent. The increase of temperature resulted in decreased values of , and higher values for kd. Using the experimental data effect of temperature was incorporated in a kinetic model previously developed for anaerobic reduction of sulphate. |
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Keywords: | Acid mine drainage Anaerobic sulphate reduction Continuous bioreactor Kinetic model |
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