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article · Environments

Technological Advances in Mechanical Recycling Innovations and Corresponding Impacts on the Circular Economy of Plastics

202441 citationsOpen accessCovenant University

In plain language

Plastic pollution poses severe environmental and health threats, with microplastics and nanoplastics discovered in human organs, placentas, and linked to various diseases. Evaluating global recycling capacities reveals key recyclable materials, notably high-density polyethylene, polyethylene terephthalate, and thermoplastic elastomers. While mechanical recycling remains arguably the easiest and most widespread method, technical challenges and setbacks persist across its operations. Reprocessing technologies can convert these waste plastics into viable products for sectors such as additive manufacturing, construction materials, and composite boards. By assessing approaches that balance operational ease, success rates, and minimal environmental damage, potential solutions to prevailing barriers can be identified. Addressing these technical hurdles through promising reprocessing methods supports the development of a more robust circular economy for plastic waste.

Key takeaways

  • Significant amounts of microplastics and nanoplastics have been identified in human organs and placentas, with links to multiple diseases.
  • High-density polyethylene, polyethylene terephthalate, and thermoplastic elastomers are identified as leading recyclable plastics based on global capacities.
  • Mechanical recycling represents the most common and accessible method for reprocessing plastic waste into construction materials, composite boards, and additive manufacturing inputs.
  • Existing mechanical recycling approaches face notable technical setbacks that require targeted solutions and further investigation into promising processes.

Why it matters

Plastic waste has infiltrated human biology, raising urgent health and environmental concerns. Finding effective ways to recycle high-volume plastics such as polyethylene terephthalate into useful secondary products can curb waste accumulation. Identifying simpler, less damaging mechanical reprocessing methods helps communities and industries implement practical circular economy solutions to reduce overall plastic pollution.

Commercialisation angle

The review addresses mechanical recycling applications for construction materials, composite boards, and additive manufacturing feedstocks, serving recyclers, manufacturers, and builders. Because it assesses existing technologies alongside their operational setbacks and suggests promising processes for further investigation, the research occupies an early stage of technical review, pointing industry towards viable materials such as polyethylene terephthalate and high-density polyethylene for secondary product manufacturing.

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Abstract

The impact of plastic pollution on the world and its inhabitants is yet to be fully measured. Significant quantities of microplastics and nanoplastics have been found in human organs, and many diseases have been traced to their presence. Even human placentas have been found to contain microplastics. This study examines the recycling landscape, advanced reprocessing techniques, and technical challenges in this industry. It points out the top recyclable types of plastics (such as high-density polyethylene, polyethylene terephthalate, and thermoplastic elastomers) by analyzing their different recycling capacities globally. It highlights the most advisable recycling techniques by identifying those most successful, least environmentally damaging, and easiest. Mechanical recycling is arguably the easiest and most common recycling technique. This study examines mechanical reprocessing technologies for construction materials, composite boards, additive manufacturing, and other applications. It also points out prevailing setbacks of these approaches and analyzes different solutions. Promising recycling processes are suggested for further investigation.

Research topics

  • Microplastics and Plastic Pollution
  • Recycling and Waste Management Techniques
  • Additive Manufacturing and 3D Printing Technologies

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DOI: 10.3390/environments11030038

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