Flocculation is the accumulation of colloidal particles (flocculant) and forms visible suspended particles from submicroscopic microfloc, which collide with each other and produce largely visible flocs, called pinflocs. The flocs size increases from continuous collision by interacting with inorganic polymer (coagulant + organic polymer), formed macroflocs or by adding coagulant aids (high molecular weight polymer) to help bridge, strengthen and weight the floc. Then floc is almost ready for settling down and water is for sedimentation process.
The process of flocculation is the aggregation of destabilized particles into larger flocs which can be easily removed by sedimentation and/or filtration. 


Flocculation ion (coagulation ion) –
Flocculation ion is responsible for the charge neutralization of colloidal particles.

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