How to Maximize the Effectiveness of PAM Polyacrylamide?

There are two types of coagulants used in conventional wastewater treatment, organic coagulants and inorganic coagulants. Inorganic coagulants are mainly used to neutralize and compress the double layer of colloids with opposite charges in water, making the colloids unstable and coagulating to achieve solid-liquid separation. However, if the dosage is too high, the effect will become worse. Organic coagulants adsorb and bridge unstable aggregating particles to form large flocs, which are easy to separate, but the filter cake contains too much water.

Polyacrylamide PAM is a water-soluble polymer with valuable properties such as coagulation, thickening, shear resistance, drag reduction, and dispersion. These properties are different for different derivative ions. Therefore, it is widely used in petroleum production, mineral processing, coal washing, metallurgy, chemical industry, papermaking, textile, sugar making, medicine, environmental protection, building materials, agricultural production, and other sectors.

Practice has proved that polyacrylamide PAM and polyaluminum chloride can be used together for sludge treatment because most colloid particles in sludge are negatively charged. After polyaluminum chloride is added, the negatively charged particles can be adsorbed. Then, the colloid is made unstable by compressing the double layer and neutralizing the charge. Polyacrylamide PAM has a good adsorption and bridging effect, which can make unstable particles form large flocs for separation from the liquid. Adding these products in this way can maximize their effectiveness.

Cationic polyacrylamide for wastewater is a water-soluble linear polymer organic coagulant composed of cationic monomers and acrylamide. It mainly coagulates colloids with negative charges and has functions such as turbidity removal, decolorization, adsorption, and adhesion. Anionic polyacrylamide absorbs suspended solid particles by polar groups in the molecular chain, and bridges or aggregates particles through charge neutralization to form large flocs. Non-ionic polyacrylamide is a water-soluble polymer mainly used for coagulation and clarification of various industrial wastewater. Pay attention to the following points to greatly improve the treatment effect.

Water temperature of PAM polyacrylamide

When the water temperature is low, the hydrolysis of inorganic salt coagulants is an endothermic reaction, which is not conducive to the hydrolysis of coagulants such as aluminum sulfate. When the water temperature is low, the viscosity of water is high, the Brownian motion intensity of particles weakens, and the instability of colloids and the growth of flocs are not conducive. As a coagulant, aluminum salt has a great influence on coagulation effect with water temperature. When ferrous salt is used as the coagulant, the water temperature has little effect on the coagulation effect.

PH value of PAM polyacrylamide

The acidity and alkalinity of water directly affect the hydrolysis of coagulants, the solubility of insoluble salts formed, and the coagulation effect. Different coagulants have different requirements for suitable acidity and alkalinity during coagulation.

Dosage of PAM polyacrylamide coagulant

Adding coagulants to water is the premise of removing colloidal impurities in water. The appropriate range of coagulant dosage depends on different water quality and should be determined through beaker tests. The amount and type of ions or impurities in water, the balance ions in water, turbidity, total organic carbon, organic carbon or color also directly affect the dosage and coagulation effect of flocculant reagent polyamine coagulants. The hydraulic conditions, the mixing effect after adding coagulants and flocculants, and the hydraulic conditions formed by the coagulation equipment and the clarifier have an impact on the coagulation effect.