Abstract
In previous study, we conducted removal of oil droplets in o/w emulsion by flotation involving addition of methylated milk casein (MeCS) as a flocculant in a batch system and proposed a simple kinetic model to evaluate the removal rate constant, K, which is proportional with two adsorption parameters and one experimental conditional parameter. The formers are adsorption rate constant, ka, of oil droplet and its floc onto bubble surface and the saturated adsorption density, Xs, the latter is the specific surface area per unit column volume, which is expressed as a product, (Sbτ)/V, where Sb, τ, and V are bubble surface production rate, bubble residence time within the column and the treated volume of o/w emulsion. This proportional relationship was verified from flotation experiments at the optimum dosage of MeCS, which was determined by the clarification experiment of flocculation. In this study, especially, the influence of MeCS dosage on the removal kinetics of the flotation and the variation of K was investigated. The result suggested that the flotation efficiency in the case of varying MeCS dosage was mainly controlled by the specific surface area of bubbles and the flocculation condition within the flotation column.
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