ABSTRACT
Large quantities of used oil are generated each year, which, if properly collected and processed, can be a valuable energy source or refined to produce usable products such as new lubricating oil. However, used oil is contaminated with water and other liquids, halogens, and other elements including heavy metals. It is not surprising that, in most countries, it is regarded as potentially hazardous waste and must be handled, processed, and stored appropriately. The transport, storage, and ultimate use of used oil is governed by a variety of direct and indirect national and international legislation and industry standards.
