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The Effect of Applying Treatment Sludge and Vermicompost to Soil on the Biodegradability of Poly(lactic acid) and Poly(3-Hydroxybutyrate)
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Researchers tested how soil amendments — specifically treatment sludge and vermicompost — affect the breakdown of two bioplastics, PLA and PHB, over 180 days. While PHB degraded completely within 90 days in unamended soil, PLA biodegradation jumped from just 6% in plain soil to 40–45% when organic amendments were added, suggesting these materials can significantly accelerate degradation of otherwise slow-breaking bioplastics.
In this study, the biodegradability of poly(lactic acid) (PLA), the most widely produced bioplastic, and poly(3-hydroxybutyrate) (PHB), known for its very biodegradability, was investigated in soil and soil amended with nitrogen sources, such as treatment sludge and vermicompost. Biodegradability was evaluated over 180 days by measuring the amount of carbon dioxide (CO2) and analyzing samples with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). PLA showed a low biodegradation (6%) in soil, but this increased to 40% in soil amended with treatment sludge and 45% in soil amended with vermicompost. PHB completely degraded within 90 days in soil; however, this process extended to 120 days in soil amended with vermicompost and 150 days in soil amended with treatment sludge. The organic and microbial content of the amendments enhanced PLA biodegradation, while PHB degradation slowed after 50 days as microorganisms prioritized other organic matter. SEM and FTIR analyses after 60 days showed more intense degradation of both bioplastics in soil amended with vermicompost. These findings highlight the potential of treatment sludge and vermicompost for improving bioplastic degradation, contributing to sustainable waste management and soil enhancement.
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Effects of biodegradable poly(butylene adipate‐co‐terephthalate) and poly(lactic acid) plastic degradation on soil ecosystems
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A laboratory microcosm experiment examined the degradation of PBAT and PLA biodegradable plastics in soil at 25°C and 58°C over 33 weeks, finding that higher temperatures significantly accelerated degradation and increased CO2 efflux. Only 9.2% of PBAT and 6.1% of PLA degraded at 58°C, underscoring that environmental conditions strongly govern biodegradable plastic breakdown rates.
Reductive soil disinfestation influences microbial aging of low-density polyethylene and polyhydroxyalkanoate microplastics and microbial communities in plastispheres
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Researchers examined how a soil treatment method called reductive soil disinfestation affects the breakdown of conventional and biodegradable microplastics in agricultural soil. They found that the treatment slowed the degradation of conventional polyethylene microplastics but accelerated the breakdown of biodegradable polyhydroxyalkanoate plastics. The study reveals that soil management practices can significantly influence how long different types of microplastics persist in farmland.
Potential Use of Earthworms to Enhance Decaying of Biodegradable Plastics
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Researchers examined the potential of earthworms to accelerate the biodegradation of both conventional and biobased biodegradable plastics in soil, finding that earthworm activity can enhance the physical fragmentation and microbial degradation of some polymers, though effectiveness varies significantly by polymer type. The study suggests earthworm-assisted composting as a partial strategy to reduce agricultural plastic pollution.
Biodegradable Polyesters and Low Molecular Weight Polyethylene in Soil: Interrelations of Material Properties, Soil Organic Matter Substances, and Microbial Community
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Researchers examined how biodegradable polyesters and low molecular weight polyethylene behave in soil environments, investigating their interactions with soil organic matter and microbial communities over time. They found that both biodegradable and conventional polymer microplastics alter soil microbial community composition and interact with organic matter fractions, with biodegradable plastics showing distinct but not necessarily more benign effects than conventional plastics.
Biodegradation Studies of Polyhydroxybutyrate and Polyhydroxybutyrate-co-Polyhydroxyvalerate Films in Soil
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Researchers studied the biodegradation properties of two bioplastic polymers, polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-polyhydroxyvalerate (PHBV), in soil under different moisture conditions. Both polymers degraded completely in fully saturated soil, with the study tracking changes in appearance, chemical signatures, mechanical properties, and molecular weight, supporting these materials as viable biodegradable alternatives to conventional petrochemical-derived plastics.
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