Plastic Pyrolysis to Produce Fuel

Plastic waste has become one of the fastest-growing environmental challenges worldwide, with India generating over 25,000 tonnes of plastic waste daily and global production exceeding 400 million tonnes annually. Conventional waste management methods such as landfilling and incineration are not sustainable, as they lead to harmful emissions, soil degradation, and long-term environmental damage. Plastic pyrolysis offers an advanced and eco-friendly solution by converting non-recyclable plastics into valuable fuels through thermal decomposition in the absence of oxygen. This study focuses on the design and operation of a small-scale plastic pyrolysis system to study the conversion of plastic waste into useful products. Mainly, low-density polyethylene (LDPE) such as squeeze bottles, plastic grocery bags, food wraps, and ziploc bags; high-density polyethylene (HDPE) such as shampoo bottles, cold drink bottles, and pipe trash; and polypropylene (PP), namely, yogurt cups, food containers, plastic bottle caps, and disposable syringe waste are used. The process involves collection, cleaning, and shredding of plastic waste, followed by heating in an airtight reactor at temperatures ranging from 350°C to 500°C. The generated vapors are condensed to obtain pyrolysis oil, while by-product gases, probably a mixture of carbon monoxide (CO), carbon dioxide (CO₂), and other harmful hydrocarbons, and char are also collected. During the experiment, several practical challenges were observed, including temperature instability, feedstock variability, minor leakages, inefficient condensation, and impurities in the produced oil. Despite these challenges, the results confirm that plastic pyrolysis can effectively convert waste into valuable energy resources.
The study also highlights the importance of process optimization through improved reactor design, better insulation, emission control systems, and the use of catalysts. Overall, this project demonstrates that plastic pyrolysis is a viable and sustainable waste-to-fuel technology with strong potential for future industrial and environmental applications.