Malta The Function and Use of Defoaming Agents for Electroplating Wastewater Treatment(4)

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Leveling agents are generally divided into two categories. One type of leveling agent works by adjusting the viscosity and leveling time of the paint film. Most of these leveling agents are organic solvents or mixtures with high boiling points, such as isophorone, diacetone alcohol, Solvesso 150, etc; The other is to adjust the surface properties of the paint film to play a role, and generally speaking, leveling agents refer to this type of leveling agent. This type of leveling agent migrates to the surface of the paint film through limited compatibility, affecting surface properties such as interfacial tension of the paint film, and achieving good leveling of the paint film. Depending on the chemical structure, there are three main types of leveling agents: acrylic acids, organosilicon, and fluorocarbon compounds

    Malta Chemical foam in electroplating wastewater treatment is due to the existence of many surfactants such as detergent and colloidal organic matter in the wastewater, which have strong foaming ability. Therefore, under the conditions of water flow speed, fall, aeration, blowing off, etc., a large number of small and light white brown foam will appear on the surface of the wastewater, which is unstable. There are still some differences between biological foam and chemical foam in appearance, usually showing soil brown or grayish brown. There are many reasons for this kind of foam, such as the soil brown foam caused by the low dissolved gas in the biochemical tank. Grey brown foam produced by low MLSS. Foam caused by microbial factors such as microbial abnormalities. Filamentous bacteria grow abnormally, mix and accumulate with foaming and floc particles to form foam that is difficult to eliminate, etc. The defoamer for electroplating wastewater treatment uses modified silicon polyether and modified oxane as the main raw materials to eliminate foam. It can achieve good results for chemical foam and biological foam that may appear in the electroplating wastewater system.