Abstract
ABSTRACT We report, for the first time, the preliminary results of flocculation of bentonite particles in a batch oscillatory baffled column. The effects of floe settling time, mixing intensity, polymer dose, and polymer injecting mode on percentage of flocculation were investigated. The optical density of bentonite suspension prior to and after polymer injection was measured as the means to quantify the percentage of flocculation. The results show clearly that the intensity of oscillation is an important factor to the flocculation rate, and the two-stage mixing mode produced a higher percentage of flocculation than the single-stage mode for low polymer dosages up to 10 ppm. The advantages of the incremental polymer injection method over the slug method are also discussed.
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