Abstract
The control of the flocculation of water from tidal rivers is difficult because the water characteristics oscillate rapidly. Especially ionic strength and suspended solids concentration may have 10-fold changes in less than 6 h. Hence a relationship between an optimal dose of coagulant and raw water characteristics was sought with the aid of jar-tests. A pH of 6 was shown to be an acceptable value for flocculation with iron chloride and alum. The influence of change of ionic strength was found to be negligible. Suspended solids concentration proved to be a decisive control parameter. The von Smoluchowski model is appropriate to describe the kinetics of this sweep coagulation.
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