Management and disposing of used lubricating oil (ULO) poses deleterious effects to air, land and water pollution. These contaminants not only causes environmental problems, they also have bio-accumulation effects on living organisms, reduces the inhabitants lifespan as a result of the diseases spread, poisoning and fouling of catalyst as well as corrode processing equipment. The contaminants removal in used lubricating oil is a major step to avoid pollution as discussed thoroughly by many researchers in literature. In addition, to curbing pollution, another advantage is converting waste to wealth. This review paper presents insight into various methods for removal of contaminants in used lubricating oil. The advantages and drawbacks of each method were earmarked for further study.
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Boadu et al. (2019) studied this question.
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