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20 resultsShowing papers similar to How microplastics affect sludge pyrolysis behavior: Thermogravimetry-mass spectrum analysis and biochar characteristics
ClearFate of microplastic during pyrolysis of sewage sludge
Researchers investigated what happens to microplastics embedded in sewage sludge when sludge is treated by pyrolysis, a high-temperature thermochemical process. Pyrolysis effectively destroyed most microplastic particles, but some residual polymer-derived compounds partitioned into the pyrolysis products.
Pyrolysis behavior of sewage sludge coexisted with microplastics: Kinetics, mechanism, and product characteristics
Researchers investigated the co-pyrolysis behavior of sewage sludge mixed with polyethylene and polylactic acid microplastics. They found that the presence of microplastics improved the overall pyrolysis performance and altered the composition of the resulting bio-oil and gas products. The study suggests that understanding how microplastics in sewage sludge affect thermal treatment could help optimize waste processing at wastewater treatment plants.
Fate of microplastic during pyrolysis of sewage sludge
Researchers examined how pyrolysis as a sewage sludge treatment method affects the fate of embedded microplastics, finding that thermal treatment largely destroys plastic particles. However, some polymer-derived volatile compounds transferred to pyrolysis gases and oils, suggesting that microplastic destruction does not eliminate all associated chemical risks.
Microplastics Mitigation in Sewage Sludge through Pyrolysis: The Role of Pyrolysis Temperature
The effect of pyrolysis on reducing microplastic content in sewage sludge was investigated in a lab-scale study evaluating multiple pyrolysis temperature conditions. Pyrolysis effectively degraded microplastic particles in sludge, with higher temperatures achieving greater microplastic reduction, positioning pyrolysis as a viable treatment for managing microplastic-laden organic waste.
Pyrolysis-induced migration and transformation of heavy metals in sewage sludge containing microplastics
Researchers studied how the presence of PVC and PET microplastics affects the behavior of heavy metals during sewage sludge pyrolysis. They found that microplastic addition influenced the migration and chemical transformation of metals like chromium, copper, and zinc during heating, with effects varying by plastic type and concentration. The study suggests that microplastic contamination in sewage sludge should be considered when designing pyrolysis processes for sludge recycling.
Co-pyrolysis of sewage sludge and metal-free/metal-loaded polyvinyl chloride (PVC) microplastics improved biochar properties and reduced environmental risk of heavy metals
Sewage sludge was co-pyrolyzed with metal-laden and metal-free PVC microplastics, producing biochars with improved properties and reduced environmental risk from heavy metals compared to pyrolyzing sludge alone. The study demonstrates co-pyrolysis as a strategy to address both plastic and heavy metal pollution in sludge treatment processes.
Quantitatively tracing microplastics in sewage sludge using thermodesorption gas chromatography/mass spectrometry combined with pyrolysis
Researchers developed a mass-based method using pyrolysis combined with thermal desorption gas chromatography to trace microplastics through sewage sludge treatment processes. They found that total microplastic concentrations dropped from about 8,700 micrograms per gram in primary sludge to roughly 470 micrograms per gram in final treated sludge. Centrifugal dewatering was the most effective step for removing microplastics, while thermal hydrolysis and anaerobic digestion had minimal impact.
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.
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.
The Effect of Hydrothermal Carbonization Temperature on Microplastic Content in Digested Sewage Sludge and Its Relation to the Fuel Properties of Hydrochars
Hydrothermal carbonization temperature was found to influence how microplastics are transformed into hydrochar, affecting the properties of the resulting material. Optimizing this process could convert plastic waste into useful biochar-like materials while reducing the persistence of microplastics in the environment.
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.
Changes in physicochemical and leachate characteristics of microplastics during hydrothermal treatment of sewage sludge
Researchers examined hydrothermal treatment of sewage sludge containing microplastics and found that while the process degraded polyethylene, polystyrene, and PET to varying degrees, it also generated potentially harmful leachates, highlighting trade-offs in this treatment approach.
Unraveling Co-Pyrolysis Mechanisms for Municipal Sludge and Microplastics: Thermodynamic, Kinetic, and Product Insights
Wastewater treatment plants produce large quantities of sewage sludge, which is often contaminated with microplastics from household and industrial sources. This study tested whether co-pyrolyzing sludge with polyethylene (HDPE) or PET plastic waste at high temperatures could improve energy recovery while processing microplastics. Adding 30% HDPE maximized the overall pyrolysis efficiency and changed the chemical reaction pathways, while PET had stronger facilitating effects at mid-range temperatures. The research suggests that co-pyrolysis could serve the dual purpose of sludge disposal and microplastic destruction, though the altered reaction kinetics and product mixtures require careful management.
Effects of microplastics on the properties of different types of sewage sludge and strategies to overcome the inhibition: A review
This review examined how microplastics trapped in sewage sludge during wastewater treatment affect sludge properties, microbial communities, and treatment efficiency, while discussing strategies to overcome microplastic-induced inhibition of sludge processing.
Microplastics in dyeing sludge: Whether do they affect sludge incineration?
Researchers investigated how microplastics present in dyeing sludge affect the incineration process using thermogravimetry-mass spectrometry, finding that microplastic contamination alters combustion behavior and has implications for the predominant disposal method of industrial sludge.
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.
Analytical Approaches for Analyzing Microplastics Using Pyrolysis Gas Chromatography Mass Spectrometry and Accelerated Solvent Extraction
Using a combination of solvent extraction and pyrolysis-based mass analysis, researchers quantified five plastic polymers in biosolids from two municipal wastewater treatment plants, finding that polyethylene dominated by mass. This mass-based approach complements particle-counting methods and provides a clearer picture of the true polymer burden in sludge that is often spread on agricultural soil, creating a potential pathway for microplastics to enter the food chain.
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.
Sludge-derived biochar: Physicochemical characteristics for environmental remediation
This review examines how sewage sludge can be converted into biochar, a carbon-rich material useful for cleaning up environmental contaminants including microplastics and heavy metals from water and soil. The process turns a waste product into an effective pollution filter while reducing the volume of sludge that needs disposal. This approach is relevant to microplastics research because biochar could help remove plastic particles from contaminated water and agricultural land.
Unraveling the effects and mechanisms of microplastics on anaerobic fermentation: Exploring microbial communities and metabolic pathways
Researchers investigated how five types of microplastics affect the anaerobic fermentation process used to treat sewage sludge. They found that polyethylene microplastics caused the greatest reduction in volatile fatty acid production, while polyvinyl chloride had the least impact, and all types disrupted microbial communities in distinct ways. The study suggests that microplastic contamination in wastewater could meaningfully interfere with sludge treatment efficiency.