Cost-Effective Recycling of Spent Engine Oil for Lubricant Recovery Using a Simplified Purification Process

The indiscriminate disposal of spent engine oil has emerged as a significant source of environmental pollution, particularly in urban and industrial regions. This study investigates a cost-effective and environmentally sustainable method for recycling spent engine oil using a simplified purification process. The treatment approach incorporates physical and chemical purification stages, including sedimentation, filtration, and activated carbon adsorption, to remove contaminants and regenerate the oil for reuse. Experimental analysis revealed that 70–75 liters of usable lubricating oil can be recovered from everyone hundred liters of waste oil, demonstrating high process efficiency. Compared to conventional re-refining or production from crude oil, this method significantly reduces operational complexity and energy input. The results underscore the viability of simplified recycling technologies for lubricant recovery, offering a promising solution for waste oil management in developing economies and contributing to circular economic practices in the petroleum sector.