Abstract
Waste lube oils are classified as hazardous waste due to the metal contents derived from the additives and wear. Most lube oils contain up to 20% of additives including antioxidants, anti‐wear, and de‐foaming agents which are generally used to extend the usage of lube oils and enhance engines performance. The most widely‐used additives contain metal as they exhibit efficacy in performance enhancement. However, these additives increase the hazardous level of waste lube oils and are highly toxic when released into the environment. Waste lube oils processing can minimize the toxicity and the complexity of the waste and may produce valuable products at the same time, such as, fuels, solvent, and base oils for production of new lube oils. In this paper, the common technologies for waste lube oils processing, including physical and chemical processes are reviewed. In addition, more recently developed technology such as membrane technologies and their potential application in waste lube oil processing are also discussed. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1867–1881, 2018
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