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61,005 resultsShowing papers similar to The Effect of Hydrothermal Carbonization Temperature on Microplastic Content in Digested Sewage Sludge and Its Relation to the Fuel Properties of Hydrochars
ClearMicroplastic Degradation in Sewage Sludge by Hydrothermal Carbonization: Efficiency and Mechanisms
Researchers evaluated hydrothermal carbonization as a method for degrading microplastics in sewage sludge. The study found that treatment at 260 degrees Celsius achieved a 79% reduction in microplastic concentrations, and investigated the decomposition mechanisms for different polymer types. The findings suggest that hydrothermal carbonization could be an effective approach for removing microplastics from sewage sludge before environmental disposal.
Sewage Sludge Valorization via Hydrothermal Carbonization: Optimizing Dewaterability and Phosphorus Release
This study optimized conditions for hydrothermal carbonization of sewage sludge, finding that the process improves sludge dewaterability and can release phosphorus for potential nutrient recovery. While not directly about microplastics, sewage sludge is a major reservoir of microplastics that accumulates during wastewater treatment, and managing sludge safely is important for preventing plastic particles from reaching agricultural soils.
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.
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.
How microplastics affect sludge pyrolysis behavior: Thermogravimetry-mass spectrum analysis and biochar characteristics
Microplastics in sewage sludge alter how the sludge burns during pyrolysis: PVC microplastics sped up decomposition while polyethylene and polypropylene slowed it down. This matters because sewage sludge from wastewater plants contains thousands of microplastic particles per kilogram, and understanding how they change the energy recovery and byproduct quality of sludge treatment helps improve the management of this widespread microplastic sink.
Fate 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.
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 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.
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.
Hydrothermal carbonization of plastic waste: A review of its potential in alternative energy applications
Researchers reviewed how hydrothermal carbonization — a process that converts materials into a coal-like substance using heat and water under pressure — can transform plastic waste into useful products like solid fuels, catalysts, and materials for energy storage devices. While the technology is promising, challenges like variable plastic feedstock quality and scaling up production must be addressed before widespread commercial use.
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 in Sewage Sludge: Worldwide Presence in Biosolids, Environmental Impact, Identification Methods and Possible Routes of Degradation, Including the Hydrothermal Carbonization Process
This review examines the worldwide presence of microplastics in sewage sludge and biosolids, along with their environmental impact when applied to agricultural land. Researchers found that wastewater treatment plants capture roughly 90% of incoming microplastics in sludge, but land application of biosolids then redistributes these particles into soils, highlighting the need for better degradation methods.
Transformations of Microplastics in Biosolids Through Hydrothermal Carbonization: A Morphological SEM Study
Researchers investigated the transformation of microplastics in biosolids subjected to Hydrothermal Carbonization (HTC) at 200-220 °C using scanning electron microscopy, finding that the process altered MP morphology and distribution, demonstrating HTC as a promising approach for reducing microplastic contamination in biosolids.
Microplastics degradation through hydrothermal liquefaction of wastewater treatment sludge
Researchers tested whether hydrothermal liquefaction (HTL) — a high-temperature, high-pressure process that converts sewage sludge into bio-crude oil — could also destroy microplastics in the sludge, finding it reduced microplastic numbers by 76% and mass by 97%, with no microplastics detected in the bio-crude product. This suggests HTL could serve a dual purpose: producing renewable fuel while significantly reducing microplastic pollution from the sludge that would otherwise be spread on farmland.
Sludge-derived biochar: A review on the influence of synthesis conditions on environmental risk reduction and removal mechanism of wastewater pollutants
This paper is not about microplastics; it reviews methods for preparing biochar from sewage sludge and its use in removing heavy metals and organic pollutants from wastewater.
Temperature-Dependent Molecular Evolution of Biochar-Derived Dissolved Black Carbon and Its Interaction Mechanism with Polyvinyl Chloride Microplastics
Researchers revealed that biochar-derived dissolved black carbon molecules evolve with formation temperature and interact with PVC microplastics through mechanisms involving hydrogen bonding and electrostatic forces, affecting microplastic fate in water.
Fate of microplastics during conventional and hydrothermal treatments of sewage sludge: a short review
This review examines the fate of microplastics during conventional and hydrothermal treatment of sewage sludge, noting that approximately 90% of microplastics entering wastewater treatment plants are retained in sludge. Researchers found that while conventional disposal routes concentrate microplastics in sludge destined for land application, hydrothermal treatments offer potential pathways to degrade or transform microplastics, though the efficiency and byproducts of these processes require further investigation.
Current understanding on the fate of contaminants during hydrothermal treatment of sewage sludge
This review examines how hydrothermal treatment of sewage sludge handles various contaminants including microplastics, heavy metals, and pharmaceuticals. While the high-temperature water treatment can break down many pollutants, its effectiveness against microplastics specifically is still being studied. Since sewage sludge is often spread on farmland, understanding how well treatment destroys microplastics is important for preventing them from entering the food supply.
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.
Enhancing sustainable waste management: Hydrothermal carbonization of polyethylene terephthalate and polystyrene plastics for energy recovery
Researchers applied hydrothermal carbonization to PET and polystyrene plastics and found PET produces higher-energy hydrochar with better energy densification (1.37 vs. 1.13) than polystyrene, identifying key structural transformations that determine each material's potential for energy recovery from plastic waste.
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.
Exploring the Potential of Hydrothermal Treatment for Microplastics Removal in Digestate
Researchers explored hydrothermal treatment as a method to remove microplastics from digestate -- the organic residue from anaerobic digestion that is widely applied to agricultural land. Hydrothermal treatment effectively degraded microplastics present in the digestate, offering a processing step that could reduce microplastic loading in biosolids before land application.
Multiple microplastics induced stress on anaerobic granular sludge and an effectively overcoming strategy using hydrochar
Researchers investigated the effects of multiple types of microplastics simultaneously on anaerobic granular sludge used in wastewater treatment. The study found that combined microplastics caused significant stress on the sludge, reducing treatment efficiency, but that adding hydrochar effectively mitigated these negative effects and restored system performance.
Addition of biochar as thin preamble layer into sand filtration columns could improve the microplastics removal from water
Researchers found that adding a thin biochar layer to sand filtration columns greatly improved microplastic removal from water, with biochar produced at higher pyrolysis temperatures performing better due to stronger electrostatic interactions with plastic particles.