Cationic Sludge Dehydration Agent Anionic Polyacrylamide PAM for Wastewater Treatment Polyacrylamide

The molecular chain of cationic polyacrylamide flocculant contains both cationic and flexible AM chains. When cationic polyacrylamide flocculants are used to treat wastewater containing colloidal particles with positive charges, flexible AM chains are adsorbed on the surface of the colloid. Not all of the polyacrylamide chains come into contact with the colloidal surface, but many of them extend into the liquid phase of the suspension. The polymer segments adsorbed on the surface of the colloid are called chains, the polymer segments extending into the liquid phase are called chains, and the tail end of the polymer is called the chain end. The chains extending into the solution and the chain end form a bridge between the colloidal particles. Due to the fact that a polymer chain has many bridges between chains and particles, when there are many adsorbed colloidal particles in the polymer chain, the colloid flocculates and settles, which is known as "bridging effect". When cationic polyacrylamide flocculants are used to treat wastewater containing colloidal particles with negative charges.

The cation in cationic polyacrylamide flocculant neutralizes the charge of anionic colloidal particles in wastewater, reducing ζ Potential, compression diffusion layer. When ζ When the potential decreases to near zero, the colloidal particles are condensed. At the same time, the long chain of cationic polyacrylamide produces a bridging effect, causing colloid flocculation. Other suspended particles are also adsorbed, enveloped, and captured, and aggregate to form large flocs, known as "neutralization and bridging". It has good sedimentation and strong decolorization ability. Due to the negative charge on the surface of organic or colloidal particles in wastewater, cationic polyacrylamide flocculants have good treatment effects.

Due to the complex changes in wastewater quality, the composition and charge properties vary greatly, and the treatment effect is also different. Therefore, in practical applications, it is necessary to first understand the water quality of wastewater, and then select appropriate cationic polyacrylamide flocculants based on this, to exert the charge neutralization and adsorption bridging effects of polyacrylamide flocculants. The effectiveness of its treatment of wastewater is related to factors such as relative molecular weight, cation degree, addition amount, and stirring time. Polyacrylamide is a linear polymer that is non-toxic, non corrosive, and easily soluble in water. After its aqueous solution is mixed with coal slurry water, the active groups on the molecular chain of polyacrylamide for coal washing adsorb on the surface of fine particles in the coal slurry water, connecting them to form larger flocs and accelerating the sedimentation rate of coal slurry. The addition of specialized polyacrylamide aqueous solution for coal washing is a key link in its treatment of coal slurry water. Adopting appropriate addition methods will help improve the flocculation effect.