Flocculation

The process in which colloids come out of suspension in the form of floc or flakes.

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What is Flocculation?

Coagulated particles can be further agglomerated by using a polymer reagent, also known as polyelectrolyte.  Polyelectrolyte enable links and bonds of various types between the particles, consequently producing larger clumps.

Flocculation by addition of polyelectrolyte

Flocculants can be used in various forms (powder, liquid emulsion or liquid at lower concentration ready to use). Several criteria’s define a polyelectrolyte : Molecular weight,  polymer structure and ionic charge.  Below is the range of application according to ionic charges.

Polyelectrolyte Cationic Anionic

 

There is a wide range of polyelectrolyte and in order to determine the right combination between flocculant type and dosing rate, jar-tests are performed in the lab with the customer’s effluent checking for the reaction time, flocs size, quality of clarification and floc resistance. Refer to our technical article on how to conduct a jar test found in our support portal if you want to carry out your own!

Do not hesitate to contact for further assistance. As we work directly with manufacturers of polyelectrolyte, we have access to a great range of polyelectrolytes.

Flocculation step is done under slow agitation or in a flocculation tube to allow the particles to be quickly and easily separated from the water, either by settlement or by flotation.

Once clarification has been obtained during flocculation, the sludge can subject to further addition of an other polyelectrolyte which may have a different structure to improve dewatering process on centrifuge, screw press or filter press.

 

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Pollution

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