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Microplastics Biodegradation by Estuarine and Landfill Microbiomes
Cristina S Pires1, Luís Costa1, Sónia G Barbosa1,2
1CEB - Centre of Biological Engineering, University of Minho, Braga, Portugal.
Microbial Ecology
|June 28, 2024
Summary
Natural microbiomes in landfill leachate and estuarine sediments can biodegrade polycaprolactone (PCL). Thermophilic bacteria, particularly Coprothermobacter sp., play a key role in this plastic degradation process.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Polymer Science
Background:
- Plastic pollution is a significant global environmental issue impacting ecosystems and human health.
- Understanding the biodegradation potential of natural microbial communities is essential for developing strategies to mitigate plastic pollution.
- Landfill leachate and estuarine sediments harbor diverse microbial populations with potential plastic-degrading capabilities.
Purpose of the Study:
- To assess the biodegradation potential of landfill leachate (LL) and estuarine sediments (ES) on polyethylene (PE), polyethylene terephthalate (PET), and polycaprolactone (PCL).
- To investigate the influence of different environmental conditions (aerobic, anaerobic, thermophilic, mesophilic) on plastic biodegradation.
- To identify key microbial players and their interactions involved in the biodegradation of plastics.
Main Methods:
- Incubation of PE, PET, and PCL with LL and ES under controlled aerobic and anaerobic conditions at thermophilic and mesophilic temperatures.
- Quantification of plastic biodegradation through mass loss measurements.
- Metataxonomic analysis (16S rRNA sequencing) to characterize microbial communities and identify potential functional genes.
Main Results:
- Polycaprolactone (PCL) showed extensive biodegradation, particularly under aerobic conditions with LL (99%) and ES (78%) within 60 days.
- Anaerobic biodegradation of PCL was significant with LL (87%) but minimal with ES (3%).
- Polyethylene (PE) and polyethylene terephthalate (PET) exhibited no significant degradation. Metataxonomic analysis identified Coprothermobacter sp. as a key thermophilic bacterium potentially responsible for PCL hydrolysis, with evidence of syntrophic interactions with Methanothermobacter sp. under anaerobic conditions and fungal involvement under aerobic conditions.
Conclusions:
- Landfill leachate and estuarine sediments possess microbial communities capable of degrading PCL, especially under aerobic and thermophilic conditions.
- Coprothermobacter sp. appears to be a crucial microorganism for PCL biodegradation, potentially through enzymatic hydrolysis.
- The findings highlight the role of microbial consortia, including bacteria and fungi, in plastic biodegradation, offering insights for bioremediation strategies.
