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DOI : 10.17640/KSWST.2021.29.1.19 ,    Vol.29, No.1, 19 ~ 25, 2021
The Anti-foaming Effects of Silicone Oil Emulsions and Non-silicone Oils
전수지 Su-ji Jun , 조세현 Se-hyun Jo , 김태근 Tae-geun Kim
In many industrial plants, foaming at liquid surfaces can reduce process efficiency and cause environmental problems with waste discharge. In most industrial sites, such as wastewater treatment plants, it is necessary to remove foam to improve water quality and process efficiency. The formation of persistent foams can be a critical problem in wastewater treatment since it can lead to operational issues and reduce the overall system performance. For basic research for the development of new defoamers, we tested defoamers for wastewater treatment. A 50% (v/v) water-dispersible foaming liquid was prepared using a foaming agent-A. Two types of defoaming agents were tested: silicone emulsion anti-foaming agents, B and C, and non-silicone oil anti-foaming agents, corn oil and mineral oil. The defoaming properties of these substances were tested as a function of pH, defoamer concentration, viscosity of defoamer dispersion, and defoamer storage period. At a pH of 3, 5, and 7, the defoaming by the silicone oil emulsion and non-silicone oil was greater than 80% effective. The foam quantity (L/min) of the silicone-based defoamer was lower even at lower concentrations than the non-silicone corn oil and mineral oil. At lower pH, the viscosity of the defoamer dispersions was slightly higher. We observed little difference in defoaming capacity after 30 days of storage.
Key Words
Defoamer, Emulsion, Foam, Mineral oil, Silicone Oil, 소포제, 에멀전, 기포, 미네랄오일, 실리콘오일
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