New study published by Zero Waste Europe (ZWE) finds that greenhouse gas emissions from mechanical recycling are lower than those from chemical recycling by a factor of 9.
The “Climate impact of pyrolysis of waste plastic packaging in comparison with reuse and mechanical recycling” study is based on the estimated future recycling content targets in plastic packaging.
BACKGROUND: In the context of the revision of the Packaging and Packaging Waste Directive (PPWD), the European Commission (EC) assigned the independent consultancy Eunomia to consider the possible introduction of recycled content targets for plastic packaging by 2030. Based on the estimated future recycling content targets in plastic packaging, Eunomia determined to recycle quantities that must come as outputs from chemical recycling or mechanical recycling. Chemical recycling, in this case, means thermo-chemical (i.e. pyrolysis) recycling.
With this study, commissioned by ZWE and Rethink Plastic alliance to Öko-Institut, the impact was calculated of Eunomia’s proposed scenario regarding greenhouse gas (GHG) emissions and carbon loss. The study compares seven scenarios to meet the projected recycled content target by 2030, and puts them into perspective with the Paris Agreement commitments to limit global warming to 1.5 degrees Celsius.
The study found that:
- Pyrolysis GHG emissions are nine times higher than those in mechanical recycling – in all scenarios considered over 75% of greenhouse gas emissions are attributable to chemical recycling;
- Over half of the carbon content of plastic is lost in the pyrolysis process and has to be replaced by new plastic;
- Mechanical recycling must be prioritised over pyrolysis wherever possible – shifting 30% of the production attributed to chemical recycling by Eunomia to mechanical recycling would reduce GHG emissions by 31%;
- Combining shift to more mechanical recycling together with a reduction of 20% of packaging would result in a 45% reduction of GHG emissions compared to the “chemical recycling scenario”.
- Combining mechanical and chemical recycling to transform plastic waste into recyclate avoids the GHG emissions associated with the use of primary plastic.
Read more and find the report at https://zerowasteeurope.eu/press-release/new-zwe-study-founds-that-to-remain-in-line-with-the-paris-agreement-mechanical-recycling-of-plastic-packaging-should-be-prioritised-over-pyrolysis/