The solubility of Ca(OH)2 in water is about 1.5 g/l. In order to use Ca(OH)2 as a coagulant , do we use 1.5 g/l or we use larger concentration (5 or 10 g/l), i.e. Ca(OH)2 in suspension. Using higher concentration will affect the turbidity of the treated wastewater.
Ca(OH)2 is not a coagulant. It is most commonly used to precipitate CaCO3 in the lime softening process. The coagulants in Ms. Tsambani's paper are FeCl3, Al2(SO4)3, and AlCl3. Ca(OH)2 was used to raise the pH in those experiments.
Dear Dr. Thomas
Ca(OH)2 is used as a coagulant. Please see the attached paper
Ca(OH)2 can be used as a coagulant as well as a softening agent, The effective concentration will depend on the volume of water to be treated. See attached file by Ariadne Tsambani
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