Abstract
Abstract: Continuous use and disposal of lubricating oil causes land, water and air pollution and also increases dependence on crude oil. This is the reason for the spread of disease, which affects every living being. Reuse of waste oil is the easiest option to avoid such pollution and dependence on crude oil. Another benefit of reusing waste oil is converting waste into money. Recycling waste lubricating oil has become an increasingly important aspect of sustainable waste management and resource conservation. Lubricant oil is made with 90% of base oil and rest of additives. In the lubricant oil, Base oil is never spoiled but after continues use of lubricating oil, it loses their properties because of continues friction, heavy load, and dirt metals absorbed hence it’s become waste oil. Here, we review the methods available to recycle the waste oil with the help of various treatment including acid treatment, clay treatment, adsorption, and solvents. The viscosity modifiers and additives used to make the SAE (Society of Automotive Engineers) grade recycled oil have also reviewed.
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