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Improving anaerobic sludge digestion system combined with high quantity of polystyrene microplastics through adding magnetite
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Researchers found that microplastics introduced during wastewater treatment are transferred into sewage sludge and survive the anaerobic digestion process, meaning they remain present when sludge is applied to agricultural land. This pathway represents a significant and underappreciated route for microplastic pollution to enter terrestrial ecosystems.
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Researchers analyzed the behavior of microplastics within anaerobic digestion processes used to treat sewage sludge, examining how particles affect microbial activity, biogas yield, and digestate quality, and what treatment modifications can improve removal. Because sewage sludge is widely applied to agricultural land as fertilizer, microplastics surviving digestion become a direct vector for soil contamination and crop uptake.
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This review examines how microplastics entering wastewater treatment plants disrupt anaerobic digestion by inducing oxidative stress in microbial communities and acting as vectors for adsorbed pollutants such as heavy metals, antibiotics, and organic contaminants. Because anaerobic digestion is the primary method for stabilizing sewage sludge, microplastic-driven disruption has direct consequences for both treatment efficiency and the safety of biosolids applied to agricultural land.
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