Effect of Slurry Aeration on Coagulation: An Application of Irregular Factorial Design Analysis
Abstract
The effect of the aeration on the coagulation of a bentonite suspension was tested in this study. The experimental
runs for this coagulation work was formed with the help of the irregular factorial design. Based on this irregular
fractional design, a statistical model (R2 = 92.65%; p-value<0.05) was computed to interpret the main effects and
interactions of the independent parameters: pH, aeration, and the Al-coagulant. The suspension pH was determined
as the most effective parameter in this system since the degree of the hydrolyses of aluminium directly varies as a
function of pH. Therefore, the increase in the suspension pH resulted in the higher sediment volumes whereas the
minimum sediment volume was obtained at pH 5. Furthermore, the interaction effect of the product: pHxaeration
in the statistical model was very critical for the performance of the process. Especially, at acidic pH levels, the
aeration adversely affected the sediment formation after the coagulation. 3-D response surfaces of the estimated
model also showed that the maximum amount of the Al-coagulant should be added at pH 5 and no aeration should
be applied for the minimization of the sediment volume
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