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Secondary degradation of anaerobic-digested and UV-pretreated plastics under cycles of freeze-thaw
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Researchers examined how freeze-thaw cycling — a common environmental process in cold climates — affects PVC and PLA plastic films that had already been weakened by anaerobic digestion and UV exposure, finding that repeated freezing and thawing strips away oxidized surface layers and releases micro- and nanoplastics along with the plasticizer bisphenol A into the surrounding water.
Cycle of freeze-thaw (CFT) is a typical environmental characteristic in cold regions during the transition from winter to spring, which may drive physical stress acting on the plastics. This study investigated the impacts of CFT on the changes to polyvinyl-chloride (PVC) and polylactic acid (PLA) plastic-film surface, sourced from anaerobic digestion (AD) and AD + UV exposure. The findings showed that under the action of AD+UV, the surface of PVC and PLA plastic-film became yellow, fragile and rough. The consequent CFT process reduced surface yellowing and abundance of oxygen-containing groups on plastic-surface increased during AD and UV exposure, as well as impelled the PLA plastic-film fragmentation. The hydrophobicity of the plastic-film surface was compromised by AD and UV treatment, with partial restoration observed after CFTs. The phenomenon could be attributed to CFT stress stripping away the fragile oxidized surface layer of the plastic-film, as evidenced by the presence of micro/nanoplastics as well as the detection of total dissolved solids (TDS), plastic-additive bisphenol A and increased turbidity in the CFT extracts. The study highlights that CFT stress may be a significant yet often overlooked environmental process that influences the environmental degradation of "organic fertilizer source" plastics.
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Insights on the characteristics of plastic surface degradation and biofilm microorganisms: Exploring the impacts of three aerobic composting (AC) as well as UV irradiation and cycles of freeze-thaw (CFTs)
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Researchers simulated how plastic films from organic fertilizer compost respond to UV radiation and freeze-thaw cycling, finding that prior composting accelerates degradation and that polyethylene and polylactic acid eventually crumble to powder while releasing micro/nanoplastic fragments and chemical additives.
Freeze-thaw alternations accelerate plasticizers release and pose a risk for exposed organisms
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Researchers investigated how freeze-thaw cycles in agricultural soils of Liaoning, China accelerate the release of phthalate ester (PAE) plasticizers from plastic mulch film residues and microplastics. They found that freeze-thaw alternations significantly increased PAE leaching and that bioaccumulation in exposed organisms poses a potential ecotoxicological risk in cold agricultural regions.
Freeze-thaw aged polyethylene and polypropylene microplastics alter enzyme activity and microbial community composition in soil
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This study found that when polyethylene and polypropylene microplastics go through freeze-thaw cycles (as they would in cold-climate soils), their surfaces change in ways that alter soil enzyme activity and shift microbial communities. These findings matter because changes in soil microbes can affect nutrient cycling and crop health, with potential downstream effects on human food systems.
Revealing the Freezing-Induced Alteration in Microplastic Behavior and Its Implication for the Microplastics Released from Seasonal Ice
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Researchers revealed how freeze-thaw cycling alters microplastic behavior in environmental matrices, finding that freezing changes particle aggregation, surface properties, and transport dynamics with implications for polar and seasonally frozen environments.
[Aging Mechanism and Release Characteristics of Dissolved Substances of Polypropylene Microplastics Under the Combined Action of Light and Freeze-thaw Cycles].
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Scientists studied how sunlight and repeated freezing-and-thawing (like what happens in cold climates) break down common plastic (polypropylene) into smaller pieces called nanoplastics. They found that sunlight alone caused plastic to break into more, smaller nanoplastic particles over time, while freezing and thawing actually had the opposite effect, producing fewer but larger particles. This matters because it shows that how plastic breaks down—and how tiny the resulting particles get—depends heavily on climate conditions, which affects how much of these particles might end up in our water, soil, and eventually our bodies.
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