KAIST Uncovers Divergent Fates of Biodegradable Plastics and Identifies Potential Microbial Degraders in Landfill Leachate (IMAGE)
Caption
Figure 2. Contrasting anaerobic fates of biodegradable plastics in landfill leachate: Changes in PHB, PLA, and PBAT films before and after incubation and a schematic of surface microbial colonization.
This figure provides an overview of the contrasting behavior of PHB, PLA, and PBAT under mesophilic anaerobic conditions in landfill leachate.
The researchers incubated films of the three plastics in leachate collected from an actual landfill. The images on the left show the initial appearance of the PHB, PLA, and PBAT films, while the images on the right show the appearance of representative samples recovered after incubation.
PHB films underwent extensive disintegration and largely disappeared within a short period. PLA showed gradual structural damage and deterioration over a much longer period. PBAT largely retained its film structure even after prolonged incubation, with little visible degradation.
The schematic on the right illustrates microbial colonization and biofilm formation at the plastic surface. Surface-attached microorganisms and biofilms were associated with the degradation of PHB and PLA. In particular, dense microbial colonies were observed in close association with damaged PLA surfaces, whereas PBAT showed little observable surface deterioration under the same conditions.
Together, the figure illustrates how biodegradable plastics may follow very different degradation trajectories in landfill-derived anaerobic environments and how these trajectories may be associated with microbial activity at the plastic surface.
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KAIST
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