Abstract:
© International Research Publication House Spent cutting fluids (coolant) are formed from the activity of metal processing, as a result of contamination and biodefeat of the emulsion. For disposal of spent coolant, vacuum distillation and reagent decomposition methods are used, but membrane separation methods are the most effective and environmentally friendly. In the process of separation of spent coolant by membrane methods, a concentrate is formed consisting of petroleum products (NP), fats, surfactants. Using the method of high-performance liquid chromatography using a light scattering detector, the content of fatty acids in the concentrate of fresh and spent cutting fluid obtained from a 3% emulsion using a dynamic membrane with a polystyrene surface layer was studied. The calibration dependence of the fatty acid content from 2 mg / dm3 to 8 mg / dm3 is established. It has been shown that fatty acids such as palmitic and stearic, along with petroleum products, have a negative effect on aquatic ecosystems. The experimental conditions for the quantitative analysis of fatty acids, in particular, the parameters of calibration graphs, are determined. It was found that the concentration of stearic acid in spent coolant exceeds the maximum permissible concentration for fishery waters by 14,000 times. Due to the high content of oil products, the concentrate obtained can be used as heating oil or an inhibitory additive to protect pipelines from the corrosive effects of produced water.
