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Environmental Impact of Waste Plastics and the Use of Waste Plastic-Derived Oil in Diesel Engines: A Literature Review
Summary
This literature review examined how waste plastics enter environments, degrade into microplastics, and accumulate in soils, freshwater, and oceans, and also reviewed conversion technologies including pyrolysis, catalytic cracking, and hydrothermal liquefaction for producing usable fuel oil from waste plastic. The review found that waste plastic oil blended with diesel at low ratios offers acceptable engine performance but may increase nitrogen and sulfur oxide emissions, requiring further technology optimization.
Plastic pollution has become a major global environmental issue, affecting land, water, and living organisms.This review summarizes current research on how waste plastics enter the environment, how they move and break down, and the effects they create in ecosystems and on human health.Special attention is given to the growing problem of microplastics, which continue to accumulate in soil, freshwater bodies, and oceans.The review also discusses recent progress in converting waste plastics into usable oil through processes such as pyrolysis, catalytic cracking, and hydrothermal liquefaction.These methods show strong potential for recovering energy from plastic waste, producing oils that can be refined into fuel.However, challenges remain, including inconsistent oil quality, high energy demand, and the need for improved process control.Each conversion method has specific advantages and limitations, and further research is needed to make them more efficient and environmentally friendly.Another key focus of this review is the use of waste plastic oil (WPO) as an alternative fuel for diesel engines.Studies show that blending WPO with diesel can provide acceptable engine performance, especially at low blend ratios.Combustion characteristics such as ignition delay and fuel atomization influence how these blends behave inside the engine.While WPO blends can reduce certain emissions like particulate matter and carbon monoxide, they may increase nitrogen and sulfur oxides due to fuel composition.Engine modifications and emission-control technologies are therefore important to ensure cleaner operation.Overall, this review highlights both the opportunities and the challenges associated with converting plastic waste into fuel.Continued research is essential to improve conversion technologies, enhance fuel stability, reduce emissions, and support the development of waste plastic oil as a reliable and sustainable alternative energy source.