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During the mixing step of coagulation, briefly discuss why gentle mixing of the solution is necessary...

During the mixing step of coagulation, briefly discuss why gentle mixing of the solution is necessary after the addition of ferric chloride? How does this impact the next step of sedimentation?

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During coagulation, after the addition of ferric chloride gentle mixing of the solution is necessary to create the conditions for efficient, effective water treatment. Flash mixing for a short time period of about 30-60seconds is necessary to distribute the chemicals properly.Coagulants prevent the repulsion of like-charged particles by neutralizing the electrical charges of fine particles present in solution and help the formation of highly adsorptive multi-charged polynuclear complexes. The mixing period should be short, to avoid the breaking of aggregating material back into small particles . This approach allows increasingly large clumps of matter to form without being broken apart by the mixing blades

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