Water treatment refers to the treatment of sewage to meet the discharge standards or reusable water quality requirements. In the process of water treatment, coagulant is an important treatment agent, which can gather the tiny particles suspended in the water into larger particles to facilitate the subsequent treatment. Among them, polymer coagulant and metal salt coagulant are two common coagulants.

Polymer coagulant is a kind of polymer organic compound, which has strong adsorption performance and aggregation ability. Common polymer coagulants include: polydimethyl diallylammonium chloride, polyacrylamide. In water treatment, polymer coagulant can be adsorbed on the surface of small particles, so that its charge is neutralized, so as to aggregate into larger particles, which is convenient for subsequent treatment. The advantage of polymer coagulant is that its treatment effect is stable, able to treat many types of sewage, and has little impact on water quality. In addition to these advantages, polymer coagulants are relatively easy to use and store. They also come in a variety of forms, including powders and liquids. However, the disadvantage of polymer coagulants is that they are more expensive to produce and are prone to produce sludge during the treatment process, making subsequent treatment more difficult. The amount of sludge requiring subsequent treatment can be reduced through the use of High-efficiency sludge dehydrating agent.

Metal salt coagulant is an inorganic compound whose main components are metal salts such as iron, aluminum, and zinc. In water treatment, metal salt coagulant can combine with the negative ions on the surface of tiny particles to make them gather into larger particles, which is convenient for subsequent treatment. The advantage of metal salt coagulant is that its treatment effect is significant, can quickly treat a large amount of sewage, and low cost. However, the disadvantage of metal salt coagulant is that it has a certain impact on the water quality, and it is easy to produce sediments, increasing the difficulty of subsequent treatment.

In summary, polymer coagulant and metal salt coagulant have their own advantages and disadvantages. In practical application, it is necessary to choose the appropriate coagulant according to different types of sewage and water treatment requirements, in order to achieve the desired treatment effect.

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