Look before you leap: Are increased recycling efforts accelerating microplastic pollution?

Area of Science:

• Environmental Science
• Materials Science
• Polymer Science

Background:

• Global policies aim to boost plastic recycling and recycled content to combat pollution and achieve net-zero goals.
• Increased use of recycled plastics creates pressure to find end markets, potentially leading to lower quality applications and material substitution.
• Both scenarios can increase microplastic (MP) generation due to inherent recyclate degradation and application types.

Purpose of the Study:

• To propose a framework for assessing microplastic generation risks from plastic applications throughout their lifecycle.
• To investigate the impact of increased recycled content on microplastic pollution.
• To identify specific end markets and lifecycle stages with higher MP release potential.

Main Methods:

• Development of a lifecycle-based risk assessment framework for MP generation.
• Application of the framework to prominent recycled plastic end markets: textiles and wood-plastic composites.
• Analysis of degradation effects during production, use, and end-of-life phases.

Main Results:

• The framework enables systematic risk evaluation of MP generation from recycled plastic applications.
• Increased recycled content is expected to correlate with increased MP pollution due to material degradation.
• Textiles and wood-plastic composites show potential for higher MP release at various lifecycle stages.

Conclusions:

• Rising recycled content in plastics, while intended to reduce virgin material demand, poses a significant risk of increased microplastic pollution.
• A comprehensive lifecycle assessment is crucial for understanding and mitigating MP generation from recycled plastics.
• Further research and policy guidance are needed to set appropriate recycling and recycled content targets.