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Effect of Microplastics on Anaerobic Digestion Process with Rapidly Degradable Organic Matter.
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A controlled batch study found that polystyrene, PET, and HDPE microplastics moderately inhibit methane production in anaerobic digesters, with HDPE causing up to a 24% reduction, while the microbial community showed overall resilience with HDPE being the notable exception. This is significant for microplastic pollution research because anaerobic digestion is a primary wastewater sludge treatment pathway, and microplastic interference threatens both energy recovery efficiency and the fate of plastics in biosolids applied to agricultural land.
The increasing presence of microplastics (MPs) in wastewater sludge raises concerns about their potential interference with anaerobic digestion (AD), a key process for energy recovery and sludge stabilization. This study investigated the impact of three common MPs, polystyrene (PS), polyethylene terephthalate (PET), and high-density polyethylene (HDPE), on the anaerobic degradation of a synthetic, rapidly biodegradable substrate under controlled batch conditions with the biomass from an anaerobic digester as inoculum. Biogas production, intermediate metabolic parameters, and microbial community dynamics were comprehensively assessed. The results showed a moderate inhibition of methane yield in the presence of MPs, with HDPE causing the most significant reduction (up to 24%) in biogas generation. PS exhibited the lowest impact, independent of the concentration added (0.5 and 1.0 g·L−1). The microbial community structure demonstrated robustness, with Firmicutes and Bacteroidota maintaining dominance and methanogenic populations largely unaffected, except in the presence of HDPE. Raman spectroscopy indicated that none of the MPs underwent substantial structural degradation, but the subtle spectral shifts—particularly in PET—suggested the initial stages of physicochemical alteration. These findings offer new insights into the short-term resilience and adaptability of anaerobic microbiomes in the presence of MPs while revealing potential signals of process disruption.
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Effect of Microplastics on Anaerobic Digestion Process with Rapidly Degradable Organic Matter.
AI summary Read the abstract
A controlled batch study found that polystyrene, PET, and HDPE microplastics moderately inhibit methane production in anaerobic digesters, with HDPE causing up to a 24% reduction, while the microbial community showed overall resilience with HDPE being the notable exception. This is significant for microplastic pollution research because anaerobic digestion is a primary wastewater sludge treatment pathway, and microplastic interference threatens both energy recovery efficiency and the fate of plastics in biosolids applied to agricultural land.
Resilience of anaerobic digestion to polypropylene microplastic contamination: Kinetic and structural evidence
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This life cycle assessment evaluated the environmental impacts of plastic products or alternative materials across their full production, use, and disposal cycle. The analysis identified key hotspots of environmental burden and compared trade-offs between plastic and substitute materials for informed decision-making.
Effects of Micro(nano)plastics on Anaerobic Digestion and Their Influencing Mechanisms
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This review examines how micro- and nanoplastics from organic waste streams affect anaerobic digestion (AD) performance, covering impacts on methane production, microbial community structure, and enzyme activity. It identifies plastic polymer type and concentration as key variables determining whether MPs stimulate or inhibit digestion processes.
Fate and Impacts of Microplastics in Sludge Anaerobic Digestion: Effects on Methanogenic and Acidogenic Pathways
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This review examined how microplastics in sewage sludge influence anaerobic digestion performance, covering effects on methane production, volatile fatty acid accumulation, and microbial community function. MPs inhibited methanogenesis at higher concentrations by altering microbial community structure and disrupting electron transfer pathways in the anaerobic digestion process.
Systematic study of microplastics on methane production in anaerobic digestion: Performance and microbial response
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Microplastics are increasingly found in wastewater treatment systems, and this study systematically examined how different types, concentrations, and sizes of microplastics affect the anaerobic digestion process used to break down sewage sludge and generate biogas. Polyethylene microplastics were found to inhibit methane production, with finer particles and higher concentrations causing greater disruption to the microbial communities driving digestion. The findings matter because microplastics in sewage sludge can impair the treatment process and also end up spread on agricultural land when sludge is used as fertilizer.
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