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Microplastics in composts, digestates, and food wastes: A review
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This review examines how food waste composting and recycling processes can introduce microplastics into agricultural soil. When food waste mixed with plastic packaging is composted or processed through anaerobic digestion, microplastic fragments can end up in the soil amendments spread on farmland. The findings highlight an overlooked pathway by which microplastics enter the food chain, as crops grown in contaminated compost may absorb or accumulate plastic particles.
Diverting food waste from landfills to composting or anaerobic digestion can reduce greenhouse gas emissions, enable the recovery of energy in usable forms, and create nutrient-rich soil amendments. However, many food waste streams are mixed with plastic packaging, raising concerns that food waste-derived composts and digestates may inadvertently introduce microplastics into agricultural soils. Research on the occurrence of microplastics in food waste-derived soil amendments is in an early phase and the relative importance of this potential pathway of microplastics to agricultural soils needs further clarification. In this paper, we review what is known and what is not known about the abundance of microplastics in composts, digestates, and food wastes and their effects on agricultural soils. Additionally, we highlight future research needs and suggest ways to harmonize microplastic abundance and ecotoxicity studies with the design of related policies. This review is novel in that it focuses on quantitative measures of microplastics in composts, digestates, and food wastes and discusses limitations of existing methods and implications for policy.
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Comprehensive understanding of microplastics in compost: Ecological risks and degradation mechanisms
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This review examines how microplastics enter soil through compost made from household waste, sewage sludge, and agricultural waste. Microplastics in compost can disrupt soil structure, reduce fertility, and persist in the environment long after application. Since compost is widely used in farming, this represents a significant pathway for microplastics to contaminate agricultural soil and potentially enter the food chain.
Plastic contamination of soil: is compost the source?
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Researchers assessed compost as a source of plastic contamination in agricultural soils, finding detectable levels of microplastics in commercial composts that are subsequently applied to farmland. This study identifies composting of plastic-contaminated organic waste as an underappreciated pathway for microplastic introduction into agroecosystems.
From waste to resource: unveiling the nexus between compost, microplastics, and agroecosystem
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This review examines how compost derived from municipal waste introduces microplastics into agricultural soils, with polypropylene, polyethylene, and PET being the most commonly found polymers. Researchers found that smaller microplastic particles pose greater risks to agroecosystem sustainability, and that even bioplastics can persist as a non-point source of contamination. The study suggests that adding biochar during composting and stricter monitoring of feedstock quality could help reduce microplastic contamination.
From organic fertilizer to the soils: What happens to the microplastics? A critical review
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This review traces how microplastics enter agricultural soil through organic fertilizers made from municipal waste, sewage sludge, and animal manure. During the composting process, the microplastics undergo physical and chemical changes that can make them better at absorbing other pollutants from the soil. The review highlights that applying organic fertilizer to farmland is a major but often overlooked pathway for microplastics to contaminate the food supply.
Microplastics and impurities in digestates and compost: A comparative study of waste-derived soil amendments
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Researchers analyzed five types of compost and digestate from organic waste treatment facilities over three months, finding microplastics in all samples at concentrations comprising 30–65% of total plastic content, with fibers, films, and fragments of polyethylene, polypropylene, and PET being most common — highlighting how even properly managed biowaste streams can introduce plastics into agricultural soils.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.