Flocculation is: The agglomeration of destabilized colloidal particles in the “charge...

• Flocculation is: The agglomeration of destabilized colloidal particles in the “charge neutralization” mode, or The agglomeration of floc particles• Agglomeration is: Causing destabilized particles, or floc to collide and to grow in size

Flocculation

Flocculation

Flocculation is, in the field of chemistry, a process where colloids come out of suspension in the form of floc or flakes. The action differs from precipitation in that, prior to flocculation, colloids are merely suspended in a liquid and not actually dissolved in a solution. in the flocculated system there is no formation of a cake since all the flocs are in the suspension.

The following chemicals are used as flocculants:alumaluminium chlorohydratealuminium sulfatecalcium oxidecalcium hydroxideiron(II) sulfateiron(III) chloridepolyacrylamidepolyDADMACsodium aluminatesodium silicate

The following natural products are used as flocculants:IsinglassGelatinGuar gumAlginates (brown seaweed extracts

DeflocculationA deflocculant is a chemical that is added to prevent a colloid from coming out of suspension. (In this case deflocculation is a desired effect).

Deflocculation is also used to describe the undesired effect in an activated sludge basin if the sludge is subjected to high-speed mixing. Generally, deflocculation can be prevented or reduced by applying gentle mixing(e.g., by using submersible propeller mixers that utilize large/wide propeller blades and operate at low rotational speed).

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