What is Cationic Polyacrylamide?

Introduction of cationic polyacrylamide

Cationic polyacrylamide is a white small particle or powder composed of cationic monomers, acrylamide, and granulated, dried and crushed. The molecular weight of cationic polyacrylamide is usually lower than that of anionic or nonionic polymers, and its clarity is mainly obtained through electric neutralization. The main function of polyacrylamide is to flocculate negatively charged colloids, while cationic polyacrylamide has the function of turbidity removal and decolorization. It is suitable for wastewater with high organic colloidal content, such as printing and dyeing, papermaking, food and aquatic product processing, as well as sludge dewatering in urban wastewater treatment processes. The activated sludge treatment method is commonly used in urban and industrial wastewater, while biochemical sludge is often a highly hydrophilic colloid that is difficult to remove moisture from. The use of cationic polyacrylamide flocculants can achieve good dewatering effect.

Reasons why cationic polyacrylamide is popular

Cationic polyacrylamide is a linear high molecular polymer co-polymerized by ethylene-based cationic monomers and acrylamide, with the English code Polyacrylamide. It is extensively used in various domestic and foreign wastewater treatment plants to remove sludge from wastewater. The large molecular chain of cationic polyacrylamide has a high positive charge density, good water solubility, strong flocculation ability, less dosage for wastewater treatment, non-toxic, and non-environmental pollution. The application of cationic polyacrylamide in sludge dewatering is superior to other types of polyacrylamide products. The dosage of cationic polyacrylamide as a flocculant under different raw water turbidity, pH, and temperature was analyzed. The experimental results showed that the optimal dosage of cationic polyacrylamide was 0.3-0.6 mg/L, and the stirring time was 4 minutes. According to the optimal reaction conditions, an experimental study of domestic sewage was conducted for one month, and the results showed that the water content of the sludge cake decreased significantly, which is the reason why cationic polyacrylamide is popular.

For sludge dewatering, the corresponding brand of this product can be selected according to the properties of the sludge, and it can effectively dewater before the sludge enters the pressure filter. When dehydrating, the flocs are large, non-sticking to the filter cloth, and do not disperse during pressure filtration. The mud cake is thick and the dehydration efficiency is high. The water content of the mud cake is less than 80%.

Cationic polyacrylamide flocculants are used for processing domestic and organic wastewater. This product exhibits positive polarity in mixed or alkaline media and can effectively flocculate, sediment, and clarify suspended particles with negative charges in wastewater. Examples include grain alcohol wastewater, papermaking wastewater, urban wastewater treatment plant wastewater, beer wastewater, monosodium glutamate wastewater, sugar-making wastewater, wastewater with high organic matter content, feed wastewater, textile dyeing wastewater, etc.