What Is Polyacrylamide PAM
Polyacrylamide PAM is a water-soluble linear polymer polymerized by free radical initiation of acrylamide monomer. As one of the most widely used varieties of water-soluble polymers, it has good flocculation properties and can reduce the frictional resistance between liquids. According to ionic properties, polyacrylamide can be divided into four types: Anionic Polyacrylamide APAM, Cationic Polyacrylamide CPAM , Non-ionic polyacrylamide NPAM and amphoteric polyacrylamide.
| Item | APAM | CPAM | NPAM |
| Solid Content ,(%) | ≥90 | ≥90 | ≥89 |
| Molecular Weight, (million) | 18~22 million | 8~12 million | 3-10 million |
| Hydrolyzing degree ,(%) | 10~30 | / | / |
| Ion degree,(%) | / | 10~60 | / |
| Ion content | / | / | ≤5 |
| Effective pH value | 7.0~14.0 | 1.0~14.0 | 1.0~8.0 |
| Dissolving time(minutes) | ≤90 | 40~60 | ≤90 |
| Packing | Net 25kg / paper bag with inner plastic bag | ||
Mechanism of Action in Water Treatment
Adsorb pollutants. Polyacrylamide has strong adsorption capacity. It can purify water by adsorbing pollutants on its surface. PAM can adsorb pollutants quickly and has a remarkable effect. Especially for sewage rich in heavy metals, the adsorption capacity of PAM is more obvious.
Flocculation role. Sewage contains a large amount of suspended solids and colloidal substances, which are difficult to remove through traditional physical or chemical methods. Adding PAM chemical can aggregate these suspended and colloidal substances into larger clumps, thereby facilitating subsequent solid-liquid separation. Specifically, the molecular structure of PAM contains a large number of carbonyl groups and amino groups. These functional groups can form hydrogen bonds or electrostatic forces with ions or molecules in the water, causing the fine particles and colloidal substances suspended in the water to form larger clusters, thus reduce the amount of suspended solids and turbidity in water.
Catalyze oxidation reactions. By adding PAM, the oxidation reaction in the water can be accelerated, thereby reducing chemical oxygen demand and biochemical oxygen demand. This helps improve water cleanliness and prevents contamination of water bodies with pollutants rich in organic waste.
Antibacterial effect. PAM chemical can also inhibit the reproduction of bacteria and viruses in water bodies. This helps prevent water bodies from being contaminated by bacteria and viruses and ensures safe water quality.
What Are Main Applications of Polyacrylamide PAM
As a precipitant and flocculant, PAM chemical can aggregate fine particles suspended in water into large particles to facilitate subsequent sedimentation and filtration. In sewage treatment, the use of polyacrylamide can increase the utilization rate of water reuse cycle and can also be used for sludge dehydration. At the same time, polyacrylamide can also absorb organic matter and heavy metal ions in water to purify water quality. Therefore, it is widely used in urban sewage treatment, industrial wastewater treatment and other fields.