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FLOCCULATION in water treatment - Coggle Diagram
FLOCCULATION
in water treatment
What is flocculation? which part in water treatment, flocculation process occur?
The purpose flocculation is to bring the particles into contact for them to agglomerate and form larger particles known as flocs.
Usually, flocculation occurs at part two during water treatment.
How does it works?
The process of flocculation generally takes place in a basin equipped with a mixer that provides agitation.
The agitation will be thorough enough to encourage inter-particle contact, but
gentle enough to prevent disintegration of existing flocculated particles.
Once floc is beginning to form, a polymer chemical is added to the wastewater. Particles grow by colliding with other particles, and sticking together.
After flocculation is complete, the large solid masses can be removed from the wastewater stream.
Flocculant
Difference between coagulant and flocculant
Coagulation
chemical process
usually salts, which break down to release charge
Flocculant
Physical process
Often a polymer which induces the settling of particles and eventually grows into larger flake
Need mixing techniques
What is flocculant?
Flocculant is a chemical that can be added to water to improve binding of the flock by increasing the size, strength and flock density
Type
Organic synthetic polymer
Inorganic
Aluminum based
Iron based
Natural polymer
Composite
Why flocculation is needed?
Advantage and disadvantage
Advantage
Removal of very fine particles.
Pesticide and heavy metal removal
Simple technology and use
Increase in the agronomic value of the sludge
Disadvantage
Process is expensive and complicated
due to increased number of required
materials and skill
Requires multiple steps
Maybe toxic if used improperly