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61,005 resultsShowing papers similar to Comparison of Thermophilic–Mesophilic and Mesophilic–Thermophilic Two-Phase High-Solid Sludge Anaerobic Digestion at Different Inoculation Proportions: Digestion Performance and Microbial Diversity
ClearDifferent responses of mesophilic and thermophilic anaerobic digestion of waste activated sludge to PVC microplastics
This study found that PVC microplastics have opposite effects on methane production depending on digestion temperature: low concentrations of PVC boosted methane yield in mesophilic (37°C) anaerobic digestion while inhibiting it under thermophilic (55°C) conditions. These effects were linked to changes in the microbial communities responsible for breaking down organic matter, with PVC disrupting key propionate-oxidizing and methanogenic bacteria at higher temperatures. The findings are important for wastewater treatment facilities that use anaerobic digestion, as microplastics in sewage sludge could affect energy recovery efficiency.
Microplastics in sewage sludge destined to anaerobic digestion: The potential role of thermal pretreatment
Researchers found that thermal pretreatment of sewage sludge at 120°C did not degrade conventional PET microplastics but did alter biodegradable microplastics, which also boosted methane production during anaerobic digestion, raising concerns about how different microplastic types behave in sludge treatment.
Microplastic Degradation through Thermal Hydrolysis in Sewage Sludge and Its Impact on the Anaerobic Process
Researchers found that thermal hydrolysis pretreatment of sewage sludge reduced microplastic concentrations from 206 particles/g to lower levels, with approximately 54% of microplastics initially in solid phase, and examined the implications for sludge management and microplastic fate.
Fate and effect of Polyamide-6 microplastics in mesophilic and thermophilic anaerobic digestion
This study examined the fate and impact of polyamide-6 microplastics during mesophilic and thermophilic anaerobic digestion, finding that digestion temperature affects polymer degradation rates and that microplastics influence methane production and microbial communities.
MicroplasticDegradation through Thermal Hydrolysisin Sewage Sludge and Its Impact on the Anaerobic Process
Researchers investigated the fate of microplastics in sewage sludge during thermal hydrolysis pretreatment and found that temperatures of 140-180°C significantly degraded microplastics while also affecting subsequent anaerobic biogas production from the treated sludge.
Efficacité des couplages digestion anaérobie mésophile- réacteur thermophile pour la réduction de la production de boues, la production de biogaz et l’élimination des micropolluants
This study evaluated a mesophilic–thermophilic anaerobic digestion configuration for sewage sludge treatment, finding it improved sludge volume reduction and biogas production while offering potential for micropollutant elimination compared to conventional digestion.
[Effects of Typical Microplastics on Methanogenesis and Antibiotic Resistance Genes in Anaerobic Digestion of Sludge].
Researchers explored the impacts of polyamide, polyethylene, and polypropylene microplastics on methanogenesis and antibiotic resistance gene dynamics during anaerobic digestion of waste sludge, examining how microplastic contamination affects both biogas production and resistance gene enrichment.
Impact of alkaline thermal hydrolysis on anaerobic digestion of mixed sludge contaminated with microplastics
Researchers tested alkaline thermal hydrolysis pretreatment on sludge containing polyethylene and PVC microplastics before anaerobic digestion, finding that the pretreatment altered how microplastics affected subsequent methane production, with effects varying by polymer type and concentration.
Thermal hydrolysis alleviates polyethylene microplastic-induced stress in anaerobic digestion of waste activated sludge
Scientists found that pretreating waste sludge with heat before anaerobic digestion reduced the negative effects that polyethylene microplastics have on the process. The thermal treatment improved methane production and helped maintain healthy microbial communities even in the presence of microplastics. The study suggests that thermal hydrolysis could be a practical strategy for wastewater treatment plants dealing with microplastic-contaminated sludge.
Effects of mesophilic and thermophilic anaerobic digestion of sewage sludge on different polymers: Perspectives on the potential of the treatment to degrade microplastics
Researchers tested whether mesophilic and thermophilic anaerobic digestion of sewage sludge could degrade common microplastic polymers. While they observed some surface changes and degradation signs in certain plastics, the process could not comprehensively break down any of the eight polymer types tested. The study concludes that anaerobic digestion of sewage sludge, under the conditions tested, is not an effective method for eliminating microplastics before sludge is applied to soil.
Systematic study of microplastics on methane production in anaerobic digestion: Performance and microbial response
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.
Thermophilic anaerobic digestion of polylactic acid, polyethylene and polypropylene microplastics: effect of inoculum-substrate ratio and microbiome
Researchers tested thermophilic and mesophilic anaerobic digestion of polyethylene, polypropylene, and polylactic acid microplastics at different substrate ratios to assess methane production and MP degradation. PLA showed greater degradation under thermophilic conditions, while PE and PP were largely resistant to both digestion temperatures.
Impact of micro-nanoplastics on biochemical phases of anaerobic digestion in sewage sludge treatment: mechanistic insights and future prospects
Micro- and nanoplastics were found to disrupt the biochemical phases of anaerobic digestion, affecting the efficiency of the biological process used to treat organic waste. Understanding these impacts is important because anaerobic digestion is a common wastewater and sludge treatment method that may both receive and process microplastic-contaminated materials.
Conversion of Materials and Energy in Anaerobic Digestion of Sewage Sludge with High-Pressure Homogenization Pretreatment
Not a microplastics paper — this study evaluates high-pressure homogenization as a pretreatment for sewage sludge before anaerobic digestion, finding it increases methane gas yield by up to 57% while helping to optimize energy use in wastewater treatment.
Thermal hydrolysis intensifies the targeted inhibition of polyethylene terephthalate microplastics on anaerobic methanogenesis in sludge: Path identification and quantitative mechanism research
Researchers found that thermal hydrolysis pretreatment intensifies the inhibitory effects of polyethylene terephthalate microplastics on anaerobic methanogenesis in sludge by altering transformation pathways, and quantified the relative contributions of these pathways using isotopic labeling and metabolic flux analysis.
The occurrence and fate of microplastics in a mesophilic anaerobic digester receiving sewage sludge, grease, and fatty slurries
Researchers analyzed microplastic loads entering and leaving a mesophilic anaerobic digester at a wastewater treatment plant serving nearly 800,000 people. They found that the digester received approximately 7,326 kg of microplastics per year, with digested sludge containing about 30% less, though this reduction was within the variability of the measurements. The study provides important data on the fate of microplastics during sewage sludge treatment processes.
Fate and Impacts of Microplastics in Sludge Anaerobic Digestion: Effects on Methanogenic and Acidogenic Pathways
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.
Anaerobic granular sludge and biofilms in anaerobic wastewater fermentation remodeled by co-exposure to microplastics and antibiotics
Researchers compared how granular sludge and biofilm-based anaerobic digestion systems respond to combined microplastic and antibiotic stress, finding that prolonged dual exposure reduced methane production and led to different microbial adaptation strategies in each sludge type.
From wastewater to sludge: The role of microplastics in shaping anaerobic digestion performance and antibiotic resistance gene dynamics
This review examines how microplastics in wastewater treatment plants affect the anaerobic digestion process used to break down sewage sludge, finding that certain plastic types can either boost or reduce biogas production depending on conditions. Importantly, microplastics increased the abundance of antibiotic resistance genes by up to 514%, raising serious concerns that wastewater treatment -- meant to protect public health -- may instead become a breeding ground for antibiotic-resistant bacteria when microplastics are present.
Is nitrification inhibition the bottleneck of integrating hydrothermal liquefaction in wastewater treatment plants?
This is not a microplastics study; it investigates how process water from hydrothermal liquefaction of sewage sludge inhibits nitrification in wastewater treatment plants, finding significant inhibition that could limit the technology's integration into conventional treatment systems.
Mesophilic anaerobic digestion of mixed sludge in CSTR and AnMBR systems: A perspective on microplastics fate
Researchers compared how two types of anaerobic digesters used in wastewater treatment affect the fate of microplastics in sewage sludge. They found that while digestion reduced some types of microplastics, it also fragmented larger particles into smaller ones, and a membrane bioreactor retained more microplastics than a conventional stirred tank. The study suggests that current wastewater treatment processes may not fully eliminate microplastics and could even create smaller, harder-to-remove particles.
Revealing the Mechanisms of Polyethylene Microplastics Affecting Anaerobic Digestion of Waste Activated Sludge
Researchers studied how polyethylene microplastics affect the anaerobic digestion of sewage sludge, a common wastewater treatment process. They found that higher concentrations of microplastics significantly reduced methane production by disrupting microbial communities and enzyme activities essential for digestion. The study reveals that microplastic contamination in wastewater systems can undermine the efficiency of sludge treatment and biogas generation.
Impact of Conditioning Agent Addition Sequence on Dewatering Performance of Advanced Anaerobic Digested Sludge
Not relevant to microplastics — this study investigates how the order of adding coagulants and flocculants affects the dewatering efficiency of anaerobically digested sewage sludge.
Microplastics in anaerobic digestion: occurrence, impact, and mitigation strategies
This review examines the presence and impact of microplastics within anaerobic digestion systems used to process sewage sludge and organic waste. Researchers found that microplastics enter these systems through diverse waste inputs and may affect biogas production, microbial community composition, and overall process performance. The study highlights the need for further research into how microplastics interact with anaerobic digestion and what mitigation strategies could minimize their interference.