Abstract
Breakdown mechanisms and flow characteristics involved in a peat bed treating oil-in-water emulsions have not yet been understood fully. This paper examines the applicability of the well-known Carman-Kozeny filtration equation to a 1000 mm peat bed treating a standard mineral oil-in-water emulsion at six different flow rates. The specific permeability coefficient, the Carman-Kozeny constant and the shape factor of peat were found to be 5.3 × 10 −11 m 2, 3.4 and 2.2, respectively. Assuming the impaction-interception mechanism to predominate, the overall coalescence efficiency of the peat bed was evaluated. The effects of flow rates and depths of peat bed on coalescence efficiency were analyzed. Contrary to the general trends observed by other investigators, coalescence efficiency decreased with an increase in bed depth (from 14% at 200 mm depths to 3% at 1000 mm depth) indicating possible simultaneous occurrence of filtration and coalescence in the peat bed.
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