Coagulation process is important in water treatment. It is a common understanding that alum is more efficient and cheaper as compared to ferric chloride. I have used these two coagulants for the treatment of Flour Mill Wastewater. Ferric Chloride is way more superior than alum. Then why do we persist with alum?
Christopher S Jones
I agree that ferric works as well or better than most other coagulants. It also seems to form a "heavy" floc that settles nicely. My experience is that it is pretty cheap. But it can depress alkalinity, if that is a concern. I also think alum might work a little better in cold water.
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Cengiz Ileten
It is important the ionic structure of the water.You can not use alum or ferric chloride for all waters.Some water react well to alum, some to FeCl3.
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