Polyacrylamide (PAM) is an organic polymer flocculant widely used in the field of water treatment. The technical indicators of PAM include ionicity, hydrolysis degree, molecular weight, etc. These indicators have a significant impact on the flocculation effect of water treatment. Understanding these indicators will help you quickly select PAM products with appropriate specifications.
Lonicity
Lonicity refers to whether the PAM molecular chain carries positive or negative charges. The degree of ionization has a significant impact on the flocculation effect of water treatment. Generally speaking, the higher the ionicity, the better the flocculation effect. This is because the highly ionic PAM molecular chains carry more charges and can better absorb suspended particles, causing them to gather together to form larger flocs.
Polyacrylamide is mainly divided into anionic (APAM), cationic (CPAM), and non-ionic (NPAM) types based on their ionicity. These three types of PAM have different effects. In practical applications, the appropriate ionicity needs to be selected based on factors such as the pH value of the treated water, the electronegativity, and concentration of suspended particles. For example, for acidic wastewater, PAM with higher cationicity should be selected; for alkaline wastewater, PAM with higher anionicity should be selected. In addition, to achieve a better flocculation effect, it can also be achieved by mixing PAM with different ionic degrees.
Degree of Hydrolysis (for APAM)
The degree of hydrolysis of PAM refers to the degree of hydrolysis of the amide groups on its molecular chain. The degree of hydrolysis can be categorized into low, medium, and high degrees of hydrolysis. PAM with different degrees of hydrolysis has different properties and uses.
PAM with a low degree of hydrolysis is mainly used for thickening and stabilization. It increases the viscosity of the solution, allowing suspended particles to disperse better. It is widely used in drilling fluids, coatings, and the food industry.
PAM with a medium degree of hydrolysis has a good flocculation effect and is suitable for various water quality treatments. It can aggregate suspended particles to form larger flocs through adsorption and bridging, thereby achieving rapid settlement. It is widely used in the fields of urban sewage treatment, industrial wastewater treatment, and sludge dehydration.
PAM with a high degree of hydrolysis has strong adsorption and decolorization capabilities and is often used in printing and dyeing wastewater treatment and other fields. It can effectively adsorb and remove harmful substances in wastewater, such as dyes, heavy metals, and organic matter, through the charges and adsorption groups on the polymer chain.
Molecular Weight
The molecular weight of PAM refers to the length of its molecular chain. Generally, the higher the molecular weight, the better the flocculation effect of PAM. This is because high molecular weight PAM can better adsorb suspended particles, causing them to gather together to form larger flocs. At the same time, high molecular weight PAM has better bonding and bridging capabilities, which can improve the strength and stability of the floc.
In practical applications, the molecular weight of PAM used for urban sewage treatment and industrial wastewater treatment requires higher requirements, generally ranging from millions to tens of millions. The molecular weight requirements of PAM used for sludge dehydration treatment are relatively low, generally ranging from millions to tens of millions.
In conclusion, indicators such as ionicity, hydrolysis degree, and molecular weight are key factors that affect the application effect of PAM in water treatment. When choosing PAM products, you should comprehensively consider the water quality and select according to PAM technical indicators to obtain the best flocculation effect, improve the efficiency, and quality of water treatment.
Post time: Jun-28-2024