The Treatment of Waste Oil-in-Water Emulsions in the Metalworking Process

Abstract

Used water emulsions obtained in the metalworking process contain oils and grease, organic compounds as well as secondary oils and anti-corrosion fluids, metal ions and other things. Since they can have a negative effect on the environment before released into the recipients, they need to be processed through the primary, secondary and tertiary phase of treatment. The primary treatment procedure of waste oil-in-water emulsions is used for the separation of free and non-emulsifying oils as well as for balancing the course of wastewater and oil concentration. In the secondary phase of treatment of waste oil-in-water emulsions, the emulsifying oil and a large fraction of dissolved oil are carried out. What follows is the tertiary biological treatment based on the basic biological processes present in nature. Key words: metalworking, waste oil-in-water emulsions, treatment

Optimization of adsorption process by aluminum dross for treatment of cutting oil wastewater

“…In addition, aluminum dross is a waste product with practical applications in numerous devices and products, such as composite fillers, refractories, coagulants, deoxidizers in steel-making, and adsorbents [6,7] During machining, oil wastewater is generated by cutting fluids, which improves efficiency by reducing power consumption, controlling rust, and extending the life of tools [8]. As most metalworking oils and fluids must be diluted before use, excessive cutting oil wastewater is produced [9,10]. Metalworking fluids (MWFs) with high biochemical and chemical oxygen demands result from repeated use of cutting fluids contaminated with trash, small chips, bacteria, and metals [11].…”