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Related Experiment Video

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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

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Published on: May 10, 2013

Biodegradable microplastics influence on organic component microbial transformation during sludge composting.

Zixuan Wang¹, Yuewei Du², Yunfei Gao¹

¹College of Life and Environmental Sciences, Minzu University of China, Beijing, China.

Frontiers in Microbiology

|May 28, 2026

Summary

Thermophilic composting at 70°C significantly degrades polylactic acid microplastics (PLA-MPs) by altering microbial communities and organic matter. This process enhances functional connectivity for efficient microplastic remediation in sludge treatment.

Keywords:

biodegradable microplastics high-throughput sequencing microbial community organic components sludge composting

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Separation and Identification of Conventional Microplastics from Farmland Soils

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Published on: March 21, 2025

Area of Science:

Environmental Science
Microbiology
Polymer Science

Background:

Sludge composting is key for resource recovery and pollution control.
Biodegradable microplastic (MP) degradation during composting is poorly understood.
Mechanisms of polylactic acid (PLA) MP biodegradation in sludge composting require investigation.

Purpose of the Study:

To investigate PLA-MP biodegradation during sludge composting at different temperatures (55°C and 70°C).
To analyze the coupled dynamics of microbial communities and organic matter transformation.
To elucidate the impact of thermophilic conditions on PLA-MP degradation and sludge organic matter.

Main Methods:

Sludge composting experiments conducted over 33 days at 55°C and 70°C.
Scanning Electron Microscopy (SEM) for PLA-MP structural analysis.
Analysis of organic components (amino acids, reducing sugars, etc.) and microbial community structure (bacterial and fungal).
Co-occurrence network analysis to understand microbial interactions.

Main Results:

Thermophilic composting (70°C) caused severe structural degradation of PLA-MPs (voids, wrinkling, fragmentation).
High temperatures enhanced the transformation of organic matter components (amino acids, reducing sugars, polysaccharides, polyphenols).
Microbial communities shifted to thermophilic bacteria (Firmicutes) and specific fungi; MPs reduced diversity but high temperatures favored specialized degraders.
Network analysis showed enhanced microbial connectivity and redundancy for MP and organic matter transformation at high temperatures.

Conclusions:

Thermophilic composting effectively degrades PLA-MPs and transforms sludge organic matter.
High temperatures selectively enrich microbial taxa crucial for organic matter and MP degradation.
Optimized thermophilic conditions can enhance microbial functional capacity for efficient MP remediation in sludge treatment.