Comparative Study On The Regeneration Of Used Motor Oil

Waste oil is a source of global pollution, both in terms of the amount generated and the environmental toxicity. The used motor oils are contaminated by contaminants and impurities resulted from undesirable oxidation processes: sediment, water, metallic particles and degraded additives.Waste oil recycling is a priority that sums up two important objectives: environmental protection and raw material economy.Also, an important aspect to note is the appropriate management of used engine oil. The waste oil samples used in the study came from different collection stations. The regeneration process used the acid treatment method consisting of the following steps: decantation, acid treatment, sedimentation/decantation, bleaching, neutralization, sedimentation/decantation and filtration. Research has made it possible to compare the results obtained by using several acids (sulfuric acid, acetic acid, nitric acid, phosphoric acid, formic acid) and two whitening methods: by industrial bleaching earth (bentonite) and active charcoal. The main properties for regenerated oils were determined: kinematic viscosity, flash point, specific gravity, TAN and color.The values of the results show their dependence on the acid used and the bleaching process.