We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Potentials and limits of mechanical plastic recycling
AI summary Read the abstract
Researchers modeled the future of plastic recycling in Switzerland through 2040, finding that even with improved waste collection and product design, mechanical recycling rates can only reach about 31% of plastic waste — reducing the carbon footprint of plastics by roughly one quarter. The study highlights that material complexity, contamination, and inaccessibility are major barriers, and that mechanical recycling alone cannot solve the plastic pollution crisis.
Abstract Plastics consumption continues to steeply increase worldwide, while resultant waste is currently mostly landfilled, discarded to the environment, or incinerated. This significantly contributes to global warming and causes negative health and ecosystem effects. Increasing the circularity of plastics can reduce these impacts. This study investigated to which extent plastics' circularity can be increased by mechanical recycling. For this purpose, future scenarios involving increased waste collection, improved product design, and improved waste sorting were assessed. The system studied consists of 11 plastic types in 69 product groups consumed and arising as waste in Switzerland. By means of a material flow analysis, the amounts of consumption, waste, and secondary material utilizable in product manufacturing were quantified for the year 2040. For the waste not mechanically recycled, treatment situations mainly involving energy recovery in waste‐to‐energy plants and cement kilns were modeled. A life cycle assessment of the complete plastic material flow system was conducted. We found that the mechanical recycling rate calculated based on the utilizable secondary material can be increased to up to 31%. This can lower the plastic carbon footprint by one quarter (1.3% of today's total Swiss carbon footprint) compared to no recycling. Important barriers to a further increase of the recycling rate were inaccessibility, the large diversity of plastic grades, and contamination. The remaining impact at maximum recycling is mainly caused by polyurethanes, polypropylene, and polystyrene production. In conclusion, the potential of mechanical plastic recycling is limited, but it can, as one of several measures, contribute to combating climate change.
More Papers Like This
Mechanical Recycling of Plastics
AI summary Read the abstract
This report reviewed current mechanical recycling technologies for plastics, examining efficiency, quality limitations, and prospects for increasing recycling rates to reduce the amount of plastic entering the environment as litter and microplastics.
Global discharge of microplastics from mechanical recycling of plastic waste
AI summary Read the abstract
Researchers found that the mechanical recycling process for plastics actually generates significant amounts of new microplastics, with global emissions from recycling projected to grow from 0.017 million tonnes in 2000 to 0.749 million tonnes by 2060. While recycling accounted for about 3.1% of total microplastic emissions in 2017, this share could grow as recycling increases. The study highlights an important paradox: efforts to reduce plastic waste through recycling can themselves contribute to microplastic pollution unless wastewater treatment at recycling facilities is improved.
Recyclable, but not recycled—an indicator to quantify the environmental impacts of plastic waste disposal
AI summary Read the abstract
This study developed an indicator to quantify the environmental impact of plastic products that are technically recyclable but are not actually recycled in practice, addressing the gap between theoretical recycling potential and real-world recovery rates. The indicator enables more accurate life cycle assessments of plastic product sustainability.
Plastic recycling: A panacea or environmental pollution problem
AI summary Read the abstract
This review examined the effectiveness of plastic recycling as a solution to plastic pollution, finding that global recycling rates of only 9% are insufficient given annual production exceeding 400 million metric tonnes. The authors identified key gaps in recycling efficiency for thermoset plastics and proposed advanced recycling methods, design-for-recyclability principles, and the Global Plastics Treaty as emerging solutions.
A review of the pathways, limitations, and perspectives of plastic waste recycling
AI summary Read the abstract
This review compares conventional and emerging plastic recycling technologies—including mechanical recycling, pyrolysis, gasification, hydrocracking, and solvent-based methods—evaluating their technical performance, environmental impacts, and economic viability, while advocating for region-specific strategies and AI-assisted sorting to improve recycling outcomes globally.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.