Lube Oil Recycling: Environmental and Economic Implications

J. T. Utsev, M. I. Aho, S. J. Uungwa


This study presents a practical investigation on the reuse of spent lubricating oil as its indiscriminate disposal by the various users daily constitutes a serious pollution problem in the environment. In carrying out this work, samples of various used lubricating oil collected at different locations were analyzed for their physical and chemical composition, to ascertain their suitability for use as fuel in the cement factory. The examined parameters gave average values of 9.4686 kcal/kg, 96 oC, 18.48, 24 oC and 7834.5 kg/m3 for caloric value, flash point, viscosity, pour point and ash content respectively. The results were compared with those of low fuel oil, used in the cement factories. Consequently, a trial burn was conducted which gave mean values of 133.7 mg/m3, 1.7 ppm, 112.3 mg/m3, ﹤25.0 mg/m3, 20.0 mg/m3, ﹤0.1 mg/m3, ﹤6.8 mg/m3 and 371.2 ppm for SPM, CO, THC, SO3, NO3, H2S, NH3 and CO3 respectively. The results obtained clearly showed that the used lubricating oil has chemical composition, calorific value and other physical properties that are comparable to those of low pour fuel oil. The results obtained from the trial burn conducted in the various cement factories, reveal that, the use of used lubricating oil as fuel in cement factories is environmental friendly and economically viable technique of disposing used lubricating oil.


Lube oil; Indiscriminate disposal; Oil pollution; Recycling; Cement factories

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