We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Biotechnological model for ubiquitous mixed petroleum- and bio-based plastics degradation and upcycling into bacterial nanocellulose
Summary
Researchers demonstrated a biotechnological approach for breaking down mixed petroleum-based and bio-based plastic waste and converting it into valuable bacterial nanocellulose. The system used engineered microbial communities to simultaneously degrade different plastic types that are typically difficult to recycle together. The study presents a promising model for sustainable end-of-life management of mixed plastic waste streams, addressing a key challenge in reducing plastic pollution.
Ubiquitous post-consumer plastic waste is often physically mixed combining recalcitrant petroleum-based plastics with bioplastics, forming (petro-bio)plastic streams. Finding appropriate end-of-life (EoL) strategies for mixed (petro-bio)plastic waste is highly pertinent in achieving environmental protection, sustainability for plastic value chain industries including recyclers and government policy makers worldwide. The presence of bioplastic mixed in with polyethylene terephthalate (PET) or other petroleum-based plastic streams poses a substantial drawback to mechanical recycling and strongly impedes the development of sustainable EoL routes. Here, we present a model system for the sustainable management of mixed (petro-bio)plastic waste, demonstrating a biotechnological route through synergy-promoted enzymatic degradation of PET–representing petrochemical polyester plastic–mixed with thermoplastic starch (TPS)–as a model bioplastic. Leaf-branch compost cutinase (LCCICCG) and commercial amylase (AMY) deliver effective depolymerization of this mixed (petro-bio)plastic material, with subsequent bio-upcycling of the mixed waste stream into bacterial nanocellulose (BNC) by Komagataeibacter medellinensis. Compared to LCCICCG and AMY, the LCCICCG/AMY combined treatment synergistically produced a 2.6- and 4.4-fold increase in enzymatic decomposition at 70 °C in four days, respectively, yielding sugars and terephthalic acid (TPA) as the main depolymerization building blocks. Bio-upcycling of post-enzymatic degradation hydrolysates resulted in a high BNC yield of 3 g L−1 after 10 days. This work paves the way for sustainable management routes for challenging mixed recalcitrant plastic and bioplastic waste and prepares opportunities for its participation in the circular production of sustainable eco-polymers.
Sign in to start a discussion.
More Papers Like This
Two-step conversion of polyethylene into recombinant proteins using a microbial platform
Researchers engineered bacteria to break down polyethylene plastic — one of the most common types of plastic pollution — and convert it into useful proteins, demonstrating a promising biological pathway for upcycling plastic waste into valuable materials.
Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges
This review examines the prospects and challenges of using microorganisms to recycle and upcycle plastic waste, assessing the current state of microbial degradation research across major polymer types. The authors identify metabolic engineering and synthetic biology as key tools needed to make biological plastic recycling economically viable at scale.
Engineering microbial division of labor for plastic upcycling
Scientists engineered a team of two specialized bacteria that work together to break down PET plastic waste and convert it into useful chemicals. This microbial partnership outperformed single-bacteria approaches, especially when dealing with high concentrations of plastic waste. The research demonstrates a promising biological method for recycling plastic pollution into valuable materials rather than letting it accumulate in the environment.
Plastic-Degrading Microbial Consortia from a Wastewater Treatment Plant
Researchers isolated bacteria from a wastewater treatment plant that can break down common plastics including polyethylene and polystyrene, some of the hardest plastics to recycle. The microbial communities worked together to degrade the plastics more effectively than individual bacterial strains. While biological plastic degradation is still slow compared to the scale of pollution, identifying these bacteria is a step toward developing biotechnology solutions for plastic waste cleanup.
The plastic and microplastic waste menace and bacterial biodegradation for sustainable environmental clean-up a review
This review examined bacterial biodegradation of plastic and microplastic waste, covering key microbial species, enzymatic mechanisms, and biotechnological approaches being developed for sustainable environmental cleanup of plastic pollution.