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61,005 resultsShowing papers similar to In situ formed sulfide–mediated aging of polystyrene microplastics and its impact on the fate of heavy metals in anaerobic digestion
ClearSulfide modifies physicochemical properties and mercury adsorption of microplastics
Researchers found that sulfide exposure modifies the surface chemistry and physicochemical properties of microplastics, significantly altering their capacity to adsorb mercury in sulfur-rich anaerobic environments like sewage and wastewater treatment plants.
Aging of polylactic acid microplastics during hydrothermal treatment of sewage sludge and its effects on heavy metals adsorption
Researchers examined how hydrothermal treatment of sewage sludge causes polylactic acid microplastics to age, and how this aging changes their heavy metal adsorption capacity. Hydrothermal treatment accelerated PLA-MP degradation, increasing surface oxygen groups and enhancing adsorption of copper, cadmium, and lead compared to untreated particles.
Sulfide induces physical damages and chemical transformation of microplastics via radical oxidation and sulfide addition
This study found that hydrogen sulfide causes physical fragmentation and chemical transformation of microplastics via radical oxidation and sulfide addition reactions, with implications for how microplastics are altered in anaerobic environments like wastewater treatment systems.
Deciphering the role of polystyrene microplastics in waste activated sludge anaerobic digestion: Changes of organics transformation, microbial community and metabolic pathway
Researchers found that polystyrene microplastics in sewage sludge affected the anaerobic digestion process used to treat waste, with low concentrations slightly boosting methane production but high concentrations reducing it by up to 11%. The microplastics disrupted key bacterial communities and enzyme activities needed for proper waste breakdown. This matters because wastewater treatment plants handle enormous volumes of microplastic-laden sludge, and impaired digestion could reduce treatment effectiveness and release more pollutants into the environment.
Bio-Aging of polyethylene during anaerobic and aerobic digestion
Researchers investigated how HDPE and LDPE microplastics affect aerobic and anaerobic digestion in wastewater treatment, while also characterizing whether the plastics themselves degrade. HDPE reduced methane production in anaerobic digestion by 26% but LDPE had no negative impact on either process, and only additive-free LDPE showed signs of bio-aging.
Exposure of polyethylene microplastics affects sulfur migration and transformation in anaerobic system
This study found that polyethylene microplastics in anaerobic wastewater treatment systems increased the production of hydrogen sulfide, a corrosive and toxic gas, by 15-27%. The microplastics promoted the activity of sulfur-processing bacteria and altered the sulfur cycle within the treatment system. This is relevant because it shows microplastics can disrupt the wastewater treatment processes that protect water quality for downstream communities.
Evaluating the Effects of Different Pretreatments on Anaerobic Digestion of Waste Activated Sludge Containing Polystyrene Microplastics
Researchers found that thermal and chemical pretreatments improved methane yields by 17-20% during anaerobic digestion of waste activated sludge containing polystyrene microplastics, though chemical methods caused greater leaching of additives from the plastic particles.
Aging mechanism of microplastics with UV irradiation and its effects on the adsorption of heavy metals
Researchers aged polystyrene microplastics using UV irradiation under three conditions (air, pure water, seawater) and found that aging changed surface chemistry and increased the microplastics' capacity to adsorb heavy metals, with seawater aging producing the most pronounced surface oxidation.
Differential effects of sulfide-induced transformation of biodegradable and conventional microplastics on sedimentary CO2 and CH4 emissions: Underlying microbiome-mediated mechanisms
Microplastics buried in sediments don't just sit inert — they interact with soil microbes in ways that affect how much methane and CO2 the sediment releases into the atmosphere. This incubation study found that fresh biodegradable plastic (PLA) dramatically increased greenhouse gas emissions, but once the plastic had aged through a chemical process called sulfidation, it actually suppressed them — while conventionally aged polyethylene had the opposite effect, boosting methane by stimulating methane-producing microbes. The findings complicate the assumption that biodegradable plastics are automatically better for the environment, and suggest that how plastics age underground matters as much as what they are made of.
Uncovering the toxic effects and adaptive mechanisms of aminated polystyrene nanoplastics on microbes in sludge anaerobic digestion system: Insight from extracellular to intracellular
Researchers investigated how nanoplastics with amino functional groups affect the anaerobic digestion process used to treat sewage sludge. They found that these surface-modified nanoplastics reduced methane production and disrupted the microbial communities responsible for breaking down waste. The study reveals that chemically modified nanoplastics may be more disruptive to wastewater treatment processes than unmodified particles.
Sulfide- and UV-induced aging differentially affect contaminant-binding properties of microplastics derived from commercial plastic products
Researchers found that sulfide- and UV-induced aging of microplastics differentially alter their ability to bind environmental contaminants, with sulfide treatment particularly enhancing chromium adsorption through thiol group formation and both processes increasing PET adsorption capacity through particle flattening.
Effect of microplastics on sulfate reduction in landfill leachate-saturated zone
Researchers investigated how different types of microplastics affect sulfate reduction in landfill leachate-saturated zones at varying temperatures. They found that polylactic acid microplastics dramatically increased hydrogen sulfide release compared to polystyrene, polyethylene, and PVC, with cumulative release at 55 degrees Celsius being 33 times higher than at 25 degrees. The study suggests that biodegradable plastics in landfills may paradoxically worsen certain pollution processes by enriching sulfate-reducing microbial communities.
Investigating the impact of microplastics on sulfur mineralization in different soil types: A mechanism study
This study used soil microcosm experiments to investigate how polystyrene and polyphenylene sulfide microplastics affect sulfur mineralization in different soil types, revealing mechanisms by which MPs alter soil physicochemical properties and microbial activity.
Evaluation the impact of polystyrene micro and nanoplastics on the methane generation by anaerobic digestion
Researchers tested the effect of polystyrene microplastics and their leached chemical additives on anaerobic digestion systems, finding that microplastic presence reduced methane generation efficiency and disrupted microbial community function.
Beyond simple inhibition: Unveiling the non-monotonic impact and multi-level mechanisms of aged microplastics on sludge anaerobic digestion
Researchers used plasma treatment to precisely control polypropylene microplastic aging and tested its effects on anaerobic sludge digestion, finding that while unaged microplastics strongly inhibited methane production, optimally aged microplastics at a carbonyl index of 0.219 recovered methane yield to 83%.
[Effects of Aging on the Cd Adsorption by Microplastics and the Relevant Mechanisms].
This study examined how aging affects the ability of microplastics — including polyethylene and polystyrene — to adsorb the heavy metal cadmium. Weathered microplastics showed different adsorption behavior than virgin particles, which has implications for how microplastics transport toxic metals through aquatic environments.
Study on the Adsorption Behavior and Mechanism of Heavy Metals in Aquatic Environment before and after the Aging of Typical Microplastics
Researchers investigated the adsorption behavior and mechanisms of heavy metals by typical microplastics before and after environmental aging, finding that aging significantly alters microplastics' surface properties and capacity to bind metals such as cadmium and lead in aquatic systems.
Polystyrene nanoplastics shape microbiome and functional metabolism in anaerobic digestion
Researchers studied how polystyrene nanoplastics and microplastics affect the microbial communities and biochemical processes in anaerobic digestion systems used for waste treatment. They found that nanoplastics had a more disruptive effect than microplastics, significantly altering the composition and metabolic functions of the microbial community. The study suggests that plastic contamination in waste streams could reduce the efficiency of anaerobic digestion, a widely used waste processing technology.
Chemical and photo-initiated aging enhances transport risk of microplastics in saturated soils: Key factors, mechanisms, and modeling
Researchers aged polystyrene microplastics using three oxidation methods and then studied their transport through saturated soil columns, finding that aging significantly increased surface hydrophilicity and mobility, with UV-activated persulfate oxidation producing the most mobile particles.
Aging properties of polyethylene and polylactic acid microplastics and their adsorption behavior of Cd(II) and Cr(VI) in aquatic environments
Researchers compared how polyethylene and polylactic acid (PLA) microplastics age in the environment and how that aging affects their ability to absorb heavy metals like cadmium and chromium from water. They found that aging changed the surface chemistry of both plastic types, increasing their capacity to pick up these toxic metals. The findings matter because aged microplastics in the environment may concentrate and transport more pollutants than fresh plastic particles.
Exposure to polystyrene nanoplastic leads to inhibition of anaerobic digestion system
Researchers showed that polystyrene nanoplastics inhibit methane production in sewage sludge digesters in a concentration-dependent manner, reducing methane yield by up to 14% and delaying the process start-up while shifting microbial community composition away from key methane-producing archaea.
Fenton aging significantly affects the heavy metal adsorption capacity of polystyrene microplastics
Researchers aged polystyrene microplastics using H2O2 and Fenton reagent and found that Fenton aging significantly increased surface oxidation and the capacity to adsorb copper, zinc, and lead, with adsorption capacity increasing as a function of aging intensity.
Aging microplastics in wastewater pipeline networks and treatment processes: Physicochemical characteristics and Cd adsorption
Researchers found that microplastics passing through wastewater pipeline networks and treatment processes develop altered physicochemical properties compared to virgin particles, with aged polyamide, polyethylene, and polystyrene showing enhanced cadmium adsorption capacity.
Sludge Thermal Hydrolysis for Mitigating Oxidative Stress of Polystyrene Nanoplastics in Anaerobic Digestion: Significance of the Solids Content
Thermal hydrolysis pretreatment of sewage sludge mitigated the oxidative stress caused by polystyrene nanoplastics in anaerobic digestion, with effectiveness varying by sludge solids content - reactive oxygen species increases were lower at 12% than at 4-8% total solids, improving methane production.