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Why the highest efficiency of the coagulation processes is not under the condition of the maximum...

  1. Why the highest efficiency of the coagulation processes is not under the condition of the maximum coagulant dosage?
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Answer #1

The efficiency of coagulation depends upon the dosage, the nature of charge and the amount of suspended particles in the water.

Many coagulants like Alum requires sufficient alkalinity in water to form the gelateneous precipitate. If the water doesn't have sufficient alkalinity then the added coagulant remains unreacted in the system and hence increasing the amount doesn't have significant effect over efficiency.

Also

When we keep increasing the dose or amount of the coagulant and if there isn't sufficient amount of suspended matter present then proper coagulation flocculation is not possible because of lesser concentration of the flocculant and hence lesser contact opportunity to form the flocculant.

In such cases addition of Coagulant Aid is beneficial as then the coagulant provides sufficient contact opportunity and hence the process of coagulation gives better efficiency.

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