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Microplastics Divert Carbon Flow in Anaerobic Digestion: A Meta-Analysis Reveals Product-Specific Effects
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Microplastics divert carbon flow in anaerobic digestion: a meta-analysis reveals product-specific effects
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Researchers conducted a meta-analysis of 55 studies and found that microplastics do not simply inhibit anaerobic digestion but redirect carbon flow within it — suppressing methane production while boosting volatile fatty acid accumulation — with the direction and magnitude of effects determined by polymer type, concentration, size, and temperature.
Impact of Microplastics on Anaerobic Digestion: A Concise Review
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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.
Microplastics and Anaerobic Digestion
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Microplastics from consumer products like toothpaste, synthetic fabrics, and vehicle tyres accumulate in sewage wastewater and pose challenges for anaerobic digestion treatment systems. Understanding how anaerobic digestion interacts with microplastics is critical for developing wastewater treatment strategies that prevent these persistent pollutants from entering soil and water ecosystems.
Occurrence and Fate of Microplastics in Anaerobic Digestion of Dewatered Sludge
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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.
Innovative Quantification of Microplastics in Digestate from Ontario Biogas Plants: Implications for Environmental Monitoring and Management
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Researchers quantified microplastics in digestate from nine Ontario biogas facilities using a novel Most Probable Number (MPN) method, finding concentrations of 6,200 to 26,000 MP per gram of dry solids and identifying source-separated organics feedstock as a major driver of higher contamination levels.
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