PDDA - PDADMAC
PDADMAC (Also called PDDA) is the most commonly used organic coagulants in water treatment. Coagulants neutralise the negative electrical charge on particles, which destabilises the forces keeping colloids apart. In water treatment, coagulation occurs when a coagulant is added to water to “destabilize” colloidal suspensions.This product (technically named Polydimethyl-Diallyl-Ammonium Chloride) is cationic polymer and it can be completely dissolved in water.
The polymer body contains strong cationic group radical and activated-adsorbent group radical which can destabilize and flocculate the suspended solids and the negative-charged water soluble matters in the waste water through electro-neutralization and bridging adsorption.
It is very effective in flocculating, decolouring, killing algae and removing organics It is use in latex waste clarification , oil-water seperation, iron congulation. The product enjoys small dosage but can cause big flocs, rapid precipitation and low turbidity residue, and it can also produce small amount of sludge. It is adaptable to wide range of pH value, between 0.5 and 1.4.
It can be widely used to treat source water and sewage water.
Water treatment coagulants are comprised of positively charged molecules that, when added to the water and mixed, accomplish this charge neutralisation. inorganic coagulants, organic coagulants or a combination of both are typically used to treat water for suspended solids removal.
In a colloidal suspension, particles will settle very slowly or not at all because the colloidal particles carry surface electrical charges that mutually repel each other. A coagulant (typically a metallic salt) with the opposite charge is added to the water to overcome the repulsive charge and “destabilise” the suspension.
PolyDADMAC is a cationic quaternary ammonium polymer which is completely dissolved in water, it contains strong cationic radical and activated adsorbent radical, which can destabilize and flocculate the suspended solids and the negative-charged water soluble matters in the wastewater through electro-neutralization and bridging adsorption.
It achieves good results in flocculating, de-coloring, killing algae and removing organics.
Polydiallyldimethylammonium chloride, also commonly polyquaternium-6, is a homopolymer of diallyldimethylammonium chloride. The molecular weight of polyDADMAC is typically in the range of hundreds of thousands of grams per mole, and even up to a million for some products.
Application & Usage:
PolyDADMAC is used in waste water treatment as a primary organic coagulant which neutralizes negatively charged colloidal material and reduces sludge volume compared with inorganic coagulants.
When used alone, it should be diluted to the concentration of 0.5%-0.05% (based on solid content).
When used to treat different source water or waste water, the dosage is based on the turbidity and the concentration of the water.
The most economical dosage is based on the trial.
The dosing spot and the mixing velocity should be carefully decided to guarantee that the chemical can be mixed evenly with the other chemicals in the water and the flocs can not be broken.
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