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Cationic polyacrylamide with different ion type used in water treatment

Polyacrylamide Names and Identifiers
Acrylamide resin
anionic polyacrylamide
Cationic Polyacrylamide
Acrylamide gel solution
non-ionic polyacrylamide
yacrylamide dry powder,non-ionic
Polyacrylamide dry powder,cationic
Polyacrylamide Physico-chemical Properties
Molecular Formula:[CH2CH(CONH2)]n
Molar Mass:71.0785
Water Solubility:SOLUBLE
Solubility:is a water-soluble polymer
Appearance:White or milk-colored flowable powder
Storage Condition:Room Temprature
Sensitive:Easily absorbing moisture
Physical and Chemical Properties:density 1.3
Cationic Polyacrylamide
C600589% MIN2.0-9.00.75-1.01000-12005%

Why is the choice of ion type the key when using cationic polyacrylamide to treat sewage? Since there are many enterprises in the industry that produce sludge and sewage, and the types of ions selected by different industries are different, it is reasonable to draw conclusions based on the nature of the water quality. So, what factors should be considered when choosing the correct cationic polyacrylamide?

Sludge is an inevitable product of sewage treatment. First of all, we should understand the source, nature, composition and solid content of sludge. According to the main components of sludge, sludge can be divided into organic sludge and inorganic sludge. Generally speaking, cationic polyacrylamide is used to treat organic sludge, and anionic polyacrylamide is used to treat inorganic sludge. It is not easy to use cationic polyacrylamide when the alkalinity is strong, but it is not suitable to use anionic polyacrylamide when the acidity is strong. When the sludge solid content is high, the amount of polyacrylamide is usually larger.

Selection of ionicity of cationic polyacrylamide: For sludge to be dewatered, flocculants with different ionicity can be selected through small experiments. Selecting the appropriate polyacrylamide can not only achieve the appropriate flocculant effect, but also reduce the dosage and save cost.

Floc size: If the floc is too small, it will affect the drainage speed. If the floc is too large, more water will be bound and the mud cake will be reduced. The size of the flocs can be adjusted by selecting the molecular weight of polyacrylamide.

Floc strength: under shear, the floc should be stable without breaking. Increasing the molecular weight of polyacrylamide or choosing a suitable molecular structure can help to improve the stability of flocs.

Mixing of polyacrylamide and sludge: polyacrylamide needs to fully react with sludge at a certain position of the dehydration equipment to produce flocculation. Therefore, the viscosity of the polyacrylamide solution needs to be appropriate, and it can be fully mixed with the sludge under the existing equipment conditions. Whether the two are well mixed is a key factor for success. The viscosity of cationic polyacrylamide solution is related to its molecular weight and preparation concentration.

Dissolution of cationic polyacrylamide: Only when it dissolves well can the flocculation effect be fully exerted. Sometimes it is necessary to increase the rate of dissolution. At this point, you can consider increasing the concentration of the polyacrylamide solution.

Due to the high production cost of PAM, the cost of using PAM in the water treatment industry has also greatly increased. However, the product is low in dosage, high in efficiency, and can take effect quickly, which can not only help customers improve the efficiency of sludge and sewage treatment, but also reduce their application costs. Therefore, the choice of cationic polyacrylamide ion type is the key.

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