What are the defoamers for sewage treatment? The foam problem in sewage treatment is a major problem in many sewage treatment projects, including initial commissioning foam, surfactant foam, impact foam, peroxide foam, foam generated by adding non-oxidizing fungicides in circulating water treatment, etc. Therefore, the use of defoamers in sewage treatment is relatively common. So what are the commonly used defoamers for sewage treatment?
The commonly used sewage treatment defoaming agents on the market can be divided into silicone (resin), surfactant, paraffin and mineral oil types according to their ingredients.
1. Silicone (resin)
Silicone resin defoamer is also called emulsion defoamer. The method of use is to emulsify silicone resin with emulsifier (surfactant) and disperse it in water and then add it to the wastewater. Silicon dioxide fine powder is another silicone defoamer with good defoaming effect.
2. Surfactants
This type of defoaming agent is actually an emulsifier, which uses the dispersing effect of surfactants to keep the foam-forming substance dispersed in a stable emulsified state in water, thereby avoiding the formation of foam.
3. Chain Alkanes
Paraffin defoamers are defoamers made by emulsifying and dispersing paraffin wax or its derivatives with an emulsifier. Their uses are similar to those of emulsified defoamers of the surfactant type.
4. Mineral Oils
Mineral oil is the main defoaming component. In order to improve the effect, it is sometimes mixed with metal soap, silicone oil, silicon dioxide and other substances. In addition, in order to make the mineral oil easily diffuse to the surface of the foaming liquid, or to make the metal soap and the like evenly dispersed in the mineral oil, various surfactants can sometimes be added.
In the process of sewage treatment, the appearance of foam will affect the growth of aquatic organisms and the operation effect of the treatment process. The sewage treatment defoamer has a good defoaming speed and can suppress foam for a long time. As for which defoamer to choose, it also needs to be decided according to the actual situation of the sewage treatment project.
