Coagulation | The Water treatments
The bivalent ion . resulting from alum makes this a very effective primary coagulant. Advantages and disadvantages of Alum. Advantages of alum are. It readily dissolves with water, and; It does not cause the unsightly reddish brown staining ... In many cases, coagulant AIDS are not required during the normal operation of the treatment plant, but are used during emergency treatment of water which has not been adequately treated in the flocculation and sedimentation basin. ...
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