Plastic Waste Recycling Technologies and Applications
Summary
Plastic waste recycling encompasses a spectrum of processes designed to recover value from end-of-life polymers and reintegrate them into manufacturing or energy systems. Mechanical recycling remains the most established route, involving collection, sorting, washing, shredding and melt-reprocessing of predominant packaging polymers such as PET, PE and PP. This pathway faces challenges of polymer degradation, contaminant management and property loss but benefits from relatively low energy demand and mature infrastructure. Chemical recycling—or advanced recycling—targets polymer depolymerisation or conversion to monomers, oligomers or fuels via pyrolysis, gasification or catalytic processes. These technologies promise to handle mixed or contaminated streams, yielding feedstocks for high-quality resins or energy recovery, albeit at higher capital and operational cost. Emerging biocatalytic routes and solvolysis approaches offer selective cleavage under mild conditions, reducing greenhouse-gas intensity. Integration of sorting innovations, compatibilisation strategies for mixed multilayer films and design-for-recycling principles is driving greater circularity. Across industrial, automotive and construction sectors, recycled plastics are evolving from low-value filler applications to near-virgin equivalents. Policy frameworks, global plastic treaties and carbon-pricing schemes are further stimulating scale-up and innovation in both mechanical and chemical recycling to meet sustainability targets.
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Plastic Waste Recycling Technologies and Applications publication trend
The graph below shows the total number of articles in plastic waste recycling technologies and applications across all publications each year (not limited to Nature Index journals).
Technical terms
Mechanical recycling: Physical reprocessing of plastic waste by sorting, cleaning, shredding and melting to produce secondary pellets.
Chemical recycling: Conversion of polymers into monomers, oligomers or fuels via chemical or thermal cleavage processes.
Pyrolysis: Thermal decomposition of organic materials in the absence of oxygen to yield liquid oils, gases and char.
Compatibilisation: Use of additives or reactive agents to enhance interfacial adhesion between immiscible polymers in mixed waste.
Upcycling: Transformation of waste plastics into products of higher value or performance than the original material.
References
- Expanding plastics recycling technologies: chemical aspects, technology status and challenges. Green Chemistry (2022).
- Mechanical Recycling of Packaging Plastics: A Review. Macromolecular Rapid Communications (2020).
- Recycling of multi-material multilayer plastic packaging: Current trends and future scenarios. Resources Conservation and Recycling (2022).
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