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Water Treatment Knowledge: Compare PAM With PAC

- Aug 30, 2017 -

Water often contains natural sedimentation method cannot remove tiny suspended matter and colloid pollutants, to this kind of wastewater must first dosing chemicals to destroy the stability of the colloid and fine suspended solids in water to form dispersed system, make its have the obvious precipitation gathered for the performance of the flocculation body, and then be separated by gravity method, the process involves two steps, coagulation and flocculation always called coagulation.

Polyaluminium chloride (PAC), also known as basic aluminium chloride or hydroxyl chloride.The colloid in sewage or sludge is precipitated rapidly by the product of it or its hydrolysis to facilitate the separation of large granule precipitates.The molecular formula of PAC is [AL2 (OH) ncl6-n] m, where n is 1-5 of any integer, m is the degree of polymerization, which is the number of links, and the value of m is not greater than 10.The coagulation effect of PAC is closely related to the ratio of OH and AL to the ratio of (n value), which is usually indicated by alkalinity, and the alkalization degree B = [OH] / (3 [AL]) X100 %.B requires a suitable PH range of 5-9 at 40-60%.The hydrolysis of the salt coagulant is similar to that of aluminum salt.

Polyacrylamide (PAM), commonly known as a flocculant or coagulant, is a coagulant.The average molecular weight of PAM is from thousands to tens of tens of millions, and there are several functional groups along the bond molecule, which can be mostly ionized in water and belong to the polymer electrolyte.It can be divided into anionic polyacrylamide, cationic polyacrylamide, and non - ionic polyacrylamide.PAM appearance is white powder, soluble in water, almost insoluble in benzene, ether and ester, acetone and other general organic solvent, PAM aqueous solution is nearly transparent viscous liquid, is a non-dangerous goods, non-toxic, non-corrosive, solid PAM has the water absorbability, moisture absorption increased with the increase of ionic degree, PAM thermal stability;

Heated to 100 ℃ stability is good, but easy to decompose during nitrogen when above 150 ℃, effect that happens in between the molecules and amination and insoluble in water, density: 1.302 mg/l (23 ℃).Glass transition temperature of 153 ℃, PAM showed non-newtonian liquid under stress.

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