Abstract
ABSTRACTThe effect of sonication on sludge exhibited a faster settling rate. Sonication creates acoustic cavitation preparing the slurry for better interaction with flocculant and generating faster settlement. Five samples of flocculants were conditioned at 25, 50, 60, 75 and 100° C for settlement. The flocculant conditioned at 60°C had the best performance in terms of settlement. However, further increase in temperature damaged polymer chains of the flocculant decreasing its effectiveness. ICP analysis showed sonicated samples trapped 11% more rare earth elements (REEs) in their residue and that temperature above 60º C is not favorable for the flocculant preparation in terms of coagulation.
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