Elimination of cutting oil wastes by promoted hydrothermal oxidation

摘要

Cutting oils are emulsionable fluids widely used in metalworking processes. Their composition is normally oil, water, and additives (fatty acids, surfactants, biocides, etc.) generating a toxic waste after a long use. Generally, it is a waster too dilute to be incinerated and it is difficult to treat biologically. Other conventional treatment methods currently used are not satisfactory from the environmental point of view. Wet air oxidation (WAO) and supercritical water oxidation (SCWO) are two forms of hydrother- mal oxidation that have been proved to be effective processes to treat a wide variety of industrial wastes, but hardly tested for oily wastes.