Fusion Enzyme ‘Boosts Polyester Textile Recycling’

Why It Matters

The breakthrough could dramatically increase the efficiency and economics of polyester recycling, accelerating the shift toward a circular textile economy and reducing reliance on virgin petrochemical feedstocks.

Key Takeaways

• Fusion enzyme degrades PET at 20% plastic loading.
• Developed by University of Portsmouth and University of Manchester.
• Enables enzymatic recycling at commercial-scale throughput.
• Could lower costs and carbon footprint of polyester reuse.

Pulse Analysis

Polyester fabrics account for a sizable share of the world’s textile waste, and traditional mechanical recycling often degrades fiber quality, limiting reuse. Chemical recycling methods, such as glycolysis, can recover monomers but require harsh conditions and high energy inputs. Enzymatic approaches promise milder processes, yet they have struggled with low reaction rates when plastic concentrations rise, a bottleneck for scaling. The new fusion enzyme directly addresses this limitation, offering a pathway to treat heavily loaded reactors without sacrificing activity.

The research team fused two complementary protein domains to create a catalyst that remains stable and active in environments containing up to 20% PET by weight. Prior enzymes typically faltered beyond 5% loading, forcing dilute reactors that inflate capital and operating costs. By contrast, the fusion construct maintains its structural integrity and catalytic efficiency, accelerating depolymerization rates and yielding higher monomer recovery. This technical leap not only improves throughput but also reduces the volume of water and auxiliary chemicals needed, aligning the process with sustainability goals.

If adopted at scale, the enzyme could reshape the polyester supply chain. Textile manufacturers could divert post‑consumer garments to enzymatic facilities, reclaiming terephthalic acid for new fibers and cutting greenhouse‑gas emissions associated with virgin polyester production. Moreover, the lower operational costs may make recycled polyester more price‑competitive, encouraging broader market uptake. Challenges remain, including enzyme production at industrial volumes and integration with existing waste‑collection infrastructure, but the study provides a compelling proof‑point for a greener, circular textile future.