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The degreasing of steel surfaces requires a large amount of degreasing agent. The cleaning solution containing this degreasing agent loses its degreasing capacity over time, necessitating continuous replenishment of the agent. This is due not only to a series of physical and chemical reactions that occur between the degreasing agent and water and oil (such as saponification, emulsification, dispersion, wetting and curling, solubilization, dissolution, etc.), which result in the loss of its degreasing ability, but also because some of the degreasing agents dissolve in the emulsified oil (O/W type), preventing them from coming into contact with the metal surface and thus reducing the degreasing efficiency of the cleaning solution. Furthermore, the content of emulsified oil in the bath solution increases over time during use; when it reaches 20–30 g/L, further degreasing becomes impossible, and the bath solution must be replaced. Inorganic ceramic membrane separation technology is used in the treatment of alkaline degreasing solutions; it enables the separation of alkaline surfactants and oils, allowing them to return to the degreasing tank, while the oils and sludge are retained. This technology not only reduces the amount of degreaser that needs to be added daily, but also significantly extends the cycle between replacements of the cleaning solution, thereby greatly cutting down the costs associated with purchasing degreaser. The degreased wastewater is pumped from the raw material tank into the circulation tank and then into the ceramic membrane device. The liquid circulates within this ceramic membrane device, while some small-molecule substances (i.e., the permeate) pass through the ceramic membrane and return to the raw material tank for reuse. When the oil concentration in the degreasing wastewater in the circulation tank reaches a certain level, concentration is stopped and the waste oil is discharged for unified treatment. http://www.jiuwu.com/tuozhi.asp Effects of ceramic membrane treatment on degreasing solutions: Average oil concentration, operating pressure difference, operating temperature, flux, oil retention rate, permeability of the degreasing agent, retained liquid (%), permeated liquid (ppm), (MPa), (℃), (m3/hm2), (%), (%) 89, 9.9, >99