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Integrated chemical-biological upcycling of polylactic acid waste into polyhydroxyalkanoates via lactate and volatile fatty acid platforms
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Scientists found a way to break down "compostable" plastic (PLA) waste and feed it to bacteria, which then transform it into a biodegradable plastic substitute called PHA — essentially turning plastic trash into new eco-friendly plastic. This matters because it offers a practical path to reduce plastic waste piling up in landfills and oceans, which can break down into microplastics that contaminate our food, water, and bodies. While still an early-stage lab process, this "chemical-biological recycling" approach could eventually help create truly circular, less polluting plastic products.
Polylactic acid (PLA) waste is an increasing environmental challenge that demands valorization routes aligned with circular bioeconomy principles. This study demonstrates an integrated chemical-biological strategy to upcycle PLA into polyhydroxyalkanoates (PHAs) through two pathways: (i) alkaline depolymerization to lactate-rich hydrolysates, acidogenic fermentation to volatile fatty acids (VFAs), and PHA accumulation, and (ii) direct PHA production from lactate-rich chemical hydrolysates. PLA was depolymerized using NaOH pretreatment (0.5–4 M) at 37 and 55 °C, achieving >90% carbon solubilization with kinetics governed by alkali strength and particle size. Mixed-culture fermentation converted lactate mainly into propionate and acetate, with hydrolysates produced at 2 M NaOH giving the highest VFA titers and activity. Cupriavidus necator assays revealed stronger interaction between substrate type and nutrient regime for PHA accumulation. VFA-rich streams under nutrient-sufficient condition supported the highest biomass and PHA production at 2 M, whereas, lactate-rich hydrolysates under nutrient-deficient (nitrogen-limited) condition yielded maximum PHB content of 84.3% ( w /w) at 0.5 M. Comparatively, the direct lactate-based route showed greater practical potential as it enabled higher polymer accumulation while avoiding the intermediate fermentation step required in the VFA-mediated pathway. Overall, the integration of alkaline depolymerization with microbial conversion highlights potential for developing simplified and scalable bioconversion strategies for plastic waste valorization, while supporting sustainable materials recovery within a circular bioeconomy framework.
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Researchers screened microorganisms from plastic-polluted sites for their ability to break down conventional plastics and produce a biodegradable alternative called PHA. They identified several bacterial strains capable of degrading synthetic polymers and simultaneously producing this bio-based plastic from waste materials. The study highlights the potential for using naturally adapted microbes from contaminated environments as tools for both plastic cleanup and sustainable material production.
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