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Microplastic Contamination in Sewage Sludge–Amended Soils and Plant Uptake
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Farm soil treated with sewage sludge fertilizer for years builds up tiny plastic particles, and these plastics were found inside the roots of wheat and lettuce grown in that soil, with lettuce absorbing more. This suggests that plastic pollution in farmland could work its way into the food we eat, though more research is needed to know what this means for our health.
The application of sewage sludge as agricultural fertilizer introduces microplastics into arable soils, raising concerns about long-term soil health and food safety. This study investigated the abundance, distribution, and polymer composition of microplastics in soils receiving sewage sludge amendments over varying durations (0, 3, 6, and 10 years) at three agricultural sites in the Indo-Gangetic Plain, India. Additionally, the uptake and translocation of microplastics in wheat (Triticum aestivum) and lettuce (Lactuca sativa) cultivated in sludge-amended soils were examined. Soil samples were collected at two depth intervals (0–20 cm and 20–40 cm), and microplastics were extracted using density separation with ZnCl₂ solution (1.6 g/cm³) followed by identification via micro-FTIR spectroscopy. Results indicated that microplastic concentrations increased significantly with sludge amendment duration, ranging from 320 ± 45 particles/kg in unamended control soils to 2,870 ± 410 particles/kg in soils with ten years of amendment history. Polyethylene, polypropylene, and polyester fibres constituted over 78% of all recovered particles. Root tissues of both crop species contained microplastics in the size range of 10–150 µm, with lettuce accumulating significantly higher concentrations than wheat. These findings underscore the role of sewage sludge application as a persistent pathway of microplastic entry into agricultural ecosystems and the human food chain.
More Papers Like This
Sewage Sludge-Mediated Microplastic Transfer to Agroecosystem: A Comprehensive Review on Detection, Fate and Ecological Impacts
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This review study shows that tiny plastic particles called microplastics are getting into farm soil through sewage sludge that's used as fertilizer. When wastewater treatment plants process our sewage, they capture these plastic bits in the leftover sludge, which farmers then spread on their fields. This matters because these microplastics could potentially affect our food supply and soil health, but scientists still need more research to understand the full risks.
Biosolid amendments as drivers for microplastic pollution in soil: Measurements and insight from multiple analytical methods in an agricultural field study
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Farms sometimes spread "biosolids" (treated sewage sludge) on fields as fertilizer, and this study measured microplastic particles in soil that had received these applications over a decade compared to untreated farmland. Using detailed chemical testing, researchers confirmed that soil treated with sludge contained identifiable plastic contamination, supporting concerns that this common farming practice can be a source of microplastics building up in agricultural land. Since these plastics can end up in the crops we eat and potentially in our food and water supply, understanding where they come from is an important step toward reducing our overall exposure.
Microplastic contamination in sewage sludge: Abundance, characteristics, and impacts on the environment and human health
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This review focuses on microplastics found in sewage sludge, which is often spread on agricultural land as fertilizer. The practice introduces microplastics directly into farm soil, where they can be taken up by crops or leach into groundwater. This creates a pathway for microplastics to reach human food and drinking water, raising concerns about the safety of using sewage sludge in agriculture.
Assessing microplastic translocation from contaminated agricultural soils to food crops
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Tiny plastic bits from mulch films, sewage-based fertilizers, and contaminated irrigation water are building up in farm soils—and this review of existing research confirms they don't just stay in the dirt. These plastics can actually move into the edible parts of crops, harm soil health and plant growth along the way, and create a direct route for plastic to end up on your plate. The researchers call for better plastic alternatives, stronger waste management, and more study to fully understand what this means for human health long-term.
Microplastics in Sludges and Soils: A Comprehensive Review on Distribution, Characteristics, and Effects
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This review summarizes research on microplastics in sewage sludge and soil, noting that when contaminated sludge is used as fertilizer, it turns farmland into a major reservoir for microplastic pollution. The accumulated microplastics can alter soil properties, harm soil organisms, and potentially enter crops and groundwater, creating pathways for human exposure through food and drinking water.
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