Defoamer is a chemical agent specially used to reduce the surface tension of liquid, so as to eliminate or inhibit the production of foam. Its core principle is to make the foam burst and disappear rapidly by destroying the stability of the foam. This is usually achieved through the specific properties of surfactants or polymer compounds, which can rapidly diffuse to the surface of foam, destroy its structure, reduce the stability of liquid film, and finally achieve the effect of defoaming.

Defoamers have a wide range of applications in various fields, especially in the water treatment industry. In the sewage treatment plant, because the sewage contains a lot of organics and surfactants, it is easy to produce a lot of foam in the process of aeration and mixing. These foam will hinder the transmission of oxygen, affect the growth and metabolism of microorganisms, and reduce the efficiency of sewage treatment. The use of water treatment defoamers can effectively eliminate these foam and improve the sewage treatment effect. In addition, in the industrial circulating cooling water system, foam may also lead to problems such as reduced cooling effect, increased energy consumption, equipment corrosion, etc., while adding an appropriate amount of defoamer can ensure the normal operation of the system.