What is polyacrylamide PAM used for?
Polyacrylamide is widely used in many occupations for flocculation, thickening, bonding, scale inhibition, stable colloid, drag reduction, gel and biological materials.
Main use: Urban and industrial wastewater are commonly treated with activated sludge. Biochemical sludge is often a highly hydrophilic colloid with high organic content and extremely difficult to dewater. It is treated with cationic polyacrylamide, with low dosage, high dehydration efficiency and easy separation. In the papermaking profession, the electrostatic bridge effect directly with inorganic salt ions, fibers and other organic polymers can enhance the physical strength of the paper and reduce the loss of fibers.
The amount of pam is small, the effect is good, and the cost is low, especially the effect of compounding with inorganic flocculant is better.
Flocculation: PAM can make suspended matter pass through electric neutralization, bridging adsorption effect, and flocculation effect.
Adhesion: It can be bonded by mechanical, physical and chemical effects.
Resistance reduction: PAM can effectively reduce the frictional resistance of fluids. Water in the water can reduce the resistance by 50-80%.
Thickening: PAM has a thickening effect under both neutral and acid conditions. When the pH is above 10, PAM is easily hydrolyzed. Thickening will be more pronounced when in a semi-mesh structure. Introduction to the principle of PAM.
Principle of flocculation effect: When PAM is used for flocculation, it is related to the surface properties of the floc species, especially the dynamic potential, viscosity, turbidity and pH value of the suspension. The dynamic potential of the particle surface is the cause of particle inhibition and participates in the surface charge. On the contrary, the PAM can lower the kinematic potential and agglomerate.
Adsorption bridge: The PAM molecular chain is fixed on the surface of different particles, and the bridges between the particles form a polymer, so that the particles form aggregates and settle.