How to correctly select and use cationic polyacrylamide to improve the efficiency of sewage treatment?
Publish Time: 2025-04-17
In the context of increasingly stringent environmental protection requirements, how to efficiently and economically treat sewage has become an important issue facing many companies and water treatment plants. Cationic polyacrylamide (CPAM), as an efficient sewage treatment agent, has demonstrated excellent performance in many fields such as sludge dewatering, wastewater treatment and drinking water purification due to its unique chemical properties. This article will explore how to correctly select and use cationic polyacrylamide to significantly improve the efficiency of sewage treatment.First of all, it is key to understand the basic properties of cationic polyacrylamide. This is a linear polymer formed by the copolymerization of cationic monomers and acrylamide. It usually appears as a white powder with a molecular weight between 8 million and 12 million. Its ionicity ranges from 10% to 60%, has good water solubility, can be dissolved in water in any proportion, but is insoluble in organic solvents. The effective pH range is between 7 and 14, which means that it can be used under a wide range of conditions and is particularly suitable for treating wastewater rich in negatively charged organic matter. Due to its polymer electrolyte properties, cationic polyacrylamide can effectively perform decolorization, adsorption, turbidity removal and bonding operations, which makes it an indispensable member in sewage treatment.In terms of sludge dewatering, urban and industrial sewage is usually treated by activated sludge method, while biochemical sludge is often difficult to dewater due to its strong hydrophilicity and high organic content. Using cationic polyacrylamide as a sludge dewatering agent not only requires a small amount of dosage, but also has extremely high dewatering efficiency and is easy to achieve solid-liquid separation. This is because cationic polyacrylamide can effectively neutralize the negative charge on the surface of sludge particles, reduce the repulsive force between particles, and thus promote particle aggregation to form larger flocs, which is convenient for subsequent filtration or centrifugal dewatering processes.Cationic polyacrylamide also performs well in the treatment of sewage and organic wastewater. Whether in acidic or alkaline environments, it can carry a positive charge, so it can effectively flocculate and settle negatively charged suspended particles in sewage. Compared with anionic polyacrylamide, nonionic polyacrylamide or inorganic salt flocculants, cationic polyacrylamide has a more significant flocculation effect, sometimes even several times or even dozens of times higher. This superiority is mainly attributed to the fact that most industrial wastewater contains a large amount of negatively charged organic matter, and cationic polyacrylamide can just solve this problem in a targeted manner.In addition, in the field of drinking water treatment, cationic polyacrylamide has also shown its unique advantages. Especially in water plants with rivers as water sources, using it as a water treatment flocculant can not only greatly reduce the dosage, improve the treatment effect, but also effectively reduce costs. When used in combination with traditional inorganic flocculants, the two complement each other, further enhancing the effect of water purification and ensuring that the effluent quality meets the standards.Correct packaging and storage methods are also important links to ensure the effectiveness of cationic polyacrylamide. The product is generally packaged in 25 kg paper-plastic composite packaging bags, and the packaging method can also be customized according to customer needs. However, if the dry powder product is exposed to the air for a long time, it is easy to absorb moisture and agglomerate, affecting the use effect. Therefore, it is recommended to store the product in a cool, ventilated and dry place, avoiding direct sunlight and humid environment.In short, by deeply understanding the characteristics and application scenarios of cationic polyacrylamide and adopting appropriate selection and use strategies, the overall efficiency and economic benefits of sewage treatment can be greatly improved. Whether it is improving the sludge dewatering process, optimizing wastewater treatment solutions, or enhancing the safety of drinking water, cationic polyacrylamide provides reliable support. This not only helps companies meet increasingly stringent environmental regulations, but also contributes to building a green and sustainable social environment.
