Anionic Polyacrylamide and Cationic Polyacrylamide play different roles in water treatment

How to choose anion pam and cation pam in sewage treatment?

In terms of production components, anionic polyacrylamide (APAM) is produced by copolymerization of acrylamide and acrylate, while cationic polyacrylamide (CPAM) is produced by copolymerization of cationic monomers and acrylamide monomers, all of which are water-soluble Polymer flocculant, flocculation and precipitation of suspended solids (ie SS) in sewage through molecular chain bridging. In the process of domestic sewage treatment, the use of polyacrylamide (PAN) is generally divided into two processes, one is the "charge neutralization" of the polymer electrolyte and the surface of the particles; the other is the formation of long chains of the polymer electrolyte and the particle bridge floc. The main purpose of flocculation is to make the fine suspended particles and colloidal particles in the sludge coalesce into coarser flocs by adding PAN. Press the mud to meet the requirements of environmental protection.

There is still a big difference between the two in terms of the composition and effect of sewage treatment. The advantages of anionic PAM over cationic PAM in sewage treatment are: less dosage, fast flocculation, rapid precipitation, compact and firm flocs, etc. Cationic PAM is often used in For "sludge dewatering", anionic PAM is suitable for "flocculation and sedimentation" and "sludge dewatering" of industrial sewage. In addition, anionic PAM is suitable for sewage treatment with positive charges on the surface of suspended solids. Compared with cationic polyacrylamide, anionic PAM has a higher molecular weight (cationic PAM has a molecular weight of 8 million to 12 million, while anionic PAM has a molecular weight of 8 million to 20 million. Oilfield plugging For leaks, it can reach as much as 35 million molecular weight). Anionic PAM in sewage treatment is suitable for neutral and alkaline water quality. In water quality, anionic PAM will repel each other between ionic groups in the same molecule. In water, the molecular branch chain stretches greatly, and has good particle flocculation function. Suspended substances can be effectively settled and separated in sewage.

According to the main components contained in sludge, sludge can be divided into "organic sludge" and "inorganic sludge". Generally speaking, cationic PAM is used to treat organic sludge, and anionic PAM is used to treat inorganic sludge. Cationic PAM is not suitable for strong alkalinity, and anionic PAM is not suitable for strong acidity. PAM is usually used when the solid content of sludge is high. The dosage is larger. For the sludge to be dewatered, a small amount of flocculants with different ion degrees can be used to select the best suitable PAM, so that the best flocculant effect can be obtained, and the amount of dosage can be minimized to save costs. The key to choosing the ion degree mainly depends on (1). The size of the floc, (2). The strength of the floc (moisture content). Too small flocs will affect the drainage speed, too large flocs will bind more water and reduce the degree of mud biscuit, but the size of the flocs can be adjusted by selecting the molecular weight of PAM. The flocculation should remain stable and not broken under the action of shearing. Selecting the appropriate PAM molecular weight or molecular structure will help the stability of the flocculation.

FAQ

What products can Polyacrylamide manufacturers provide?

Polyacrylamide manufacturers can provide different types of Polyacrylamide products, including cationic polymers, non-ionic polymers, and anionic polymers. These products can be provided in solid powder, granule, or solution form according to different needs.

What is cationic polymer used for?

Cationic polymer is very effective in sludge dewatering and DAF operations. Polymer is used as cationic flocculant before several laboratory and jar tests over a wide range of conditions especially performed in the field.

Is polyacrylamide a cationic polymer?

Cationic polyacrylamide copolymers (PAMs) are a group of water-soluble polymers with a wide range of applications in industry, food processing, agriculture and waste management. One of the major applications for PAM is sludge dewatering in municipal waste water treatment plants

What are the applications of Polyacrylamide?

Polyacrylamide has a wide range of applications in various fields. In terms of water treatment, Polyacrylamide can be used for wastewater treatment, drinking water purification, and industrial wastewater treatment, among others. Additionally, it can be used in mining, oilfield development, textiles, papermaking, soil stabilization, and construction materials.

How to choose the right Polyacrylamide product?

The technical indexes of polyacrylamide are generally molecular weight, hydrolysis degree, ionic degree, viscosity, residual monomer content, etc., so the quality of PAM can be judged from these indexes.Understand the source of sludge,and dehydration equipment also importment for us to choose the right polyacrylamide.