Microbial Upcycling of Postconsumer Plastic Waste into Value-Added Biochemicals

Overview

This solution addresses one of the most pressing challenges in plastic waste management by combining thermal deconstruction with microbial bioconversion. Postconsumer plastics such as polyesters, polypropylene, and nylon 6,6 are broken down through pyrolysis or hydrolysis into smaller, bioavailable molecules. These plastic-derived molecules are then fed to microorganisms that convert them into value-added biochemicals, including fatty acids. The hybrid approach overcomes the key limitation of microbial plastic metabolism, which is the low bioavailability of intact polymer chains, and provides a circular pathway for transforming waste streams into useful products.

Technical specifications

• Feedstock flexibility: Demonstrated with polyesters, polypropylene, and nylon 6,6; future work targets polystyrene and mixed streams containing PET, PP, HDPE, LDPE, and PS
• Deconstruction methods: Pyrolysis and hydrolysis convert solid plastic waste into a mixture of small, bioavailable molecules
• Biological conversion: Microbial hosts such as Yarrowia lipolytica convert depolymerized feedstocks into fatty acids and other biochemicals; future candidates include Acinetobacter baylyi and Rhodococcus sp.
• Circular economy alignment: Produces value-added biochemicals from waste rather than downcycling or landfilling plastics
• Complementary strategy: Designed as an alternative to single-use disposable materials, supporting broader sustainability goals

Technology readiness level

The approach has been validated with multiple polymer types and specific microbial strains, with published results demonstrating fatty acid production from thermally depolymerized polypropylene. Current work is expanding to additional plastics such as polystyrene and to mixed-feedstock streams that reflect real-world postconsumer waste compositions. The technology is positioned at an early-to-mid stage of development, with ongoing validation of new feedstocks and microbial hosts to broaden applicability and move toward scaled demonstration.