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61,005 resultsShowing papers similar to Variation in microplastic concentration, characteristics and distribution in sewage sludge & biosolids around the world
ClearVariation in microplastic concentration, characteristics and distribution in sewage sludge & biosolids around the world
Researchers systematically reviewed 65 studies on microplastics in sewage sludge and biosolids from wastewater treatment plants around the world. They found that while treatment processes remove 57% to 99% of microplastics from wastewater, the removed particles concentrate in sludge that is often applied to agricultural land. The review highlights that land application of biosolids may be a significant, underappreciated pathway for microplastic pollution in soils.
A review of the removal of microplastics in global wastewater treatment plants: Characteristics and mechanisms
This review analyzed data from 38 wastewater treatment plants across 11 countries to understand how effectively they remove microplastics. While treatment plants can remove the majority of microplastics from wastewater, significant quantities still pass through into waterways, and the microplastics captured in sewage sludge may re-enter the environment when that sludge is applied to farmland.
Review on the occurrence and fate of microplastics in Sewage Treatment Plants
This review compiled occurrence and fate data for microplastics across influent, effluent, and sludge from sewage treatment plants, finding that concentrations range up to 3,160 particles/L in raw wastewater and that treatment achieves up to 98% removal, with the retained microplastics concentrated in sludge. The authors highlight that while WWTPs protect receiving waters, sludge disposal transfers the plastic burden to soils.
Sources, fate, effects, and analysis of microplastic in wastewater treatment plants: A review
This review examines how wastewater treatment plants handle microplastics, finding that while they can remove over 90% of particles, the sheer volume of water processed means billions of microplastics still escape into waterways daily. The remaining microplastics also concentrate in sewage sludge, which is often spread on agricultural land. Wastewater treatment plants are both a filter for and a redistribution point of microplastic pollution.
Microplastic removal and management strategies for wastewater treatment plants
This review examines how well different wastewater treatment technologies remove microplastics and what management strategies can improve performance. While conventional treatment plants can remove a large percentage of microplastics from water, the particles often end up concentrated in sewage sludge that gets applied to farmland. The study highlights the need for advanced treatment options and better management of biosolids to prevent microplastics from simply being transferred from water to soil.
Microplastics in sewage sludge: Distribution, toxicity, identification methods, and engineered technologies
This review examines how microplastics accumulate in sewage sludge from wastewater treatment plants, which then becomes a major pathway for spreading these particles into the environment. Researchers found that sludge can contain extremely high concentrations of microplastics, ranging from thousands to hundreds of thousands of particles per kilogram. The study evaluates current detection methods and emerging technologies for removing microplastics from sludge before it is applied to agricultural land or disposed of.
Abundance of Microplastics in Wastewater Treatment Sludge
This review found that wastewater treatment plants trap a substantial proportion of incoming microplastics into sludge, with abundance varying widely by region based on population density, urbanization, and treatment technology, raising concerns about the land application of microplastic-laden biosolids.
A global review of microplastics in wastewater treatment plants: Understanding their occurrence, fate and impact
A global review of 121 wastewater treatment plants found that microplastics are consistently present in both influent and effluent, with WWTPs acting as major conduits delivering plastics into aquatic and terrestrial ecosystems. While removal efficiencies varied widely, the sludge produced by these plants represents a concentrated secondary pathway for microplastic release to land.
Microplastics in Sewage Sludge: Effects of Treatment
This study examined the effects of various sewage sludge treatment processes on microplastic content, finding that treatment methods differ substantially in their ability to reduce microplastic concentrations before sludge is disposed of or land-applied.
Investigation and analysis of microplastics in sewage sludge and biosolids: A case study from one wastewater treatment works in the UK
Researchers investigated microplastic contamination in sewage sludge and biosolids at a UK wastewater treatment plant and found significant quantities of microplastics persisting through the treatment process. Since millions of tonnes of biosolids are applied to farmland annually in the UK, this represents a major pathway for microplastic pollution entering agricultural soils. The study highlights the need for better monitoring and treatment methods to reduce microplastic transfer from wastewater to the terrestrial environment.
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.
Microplastics removal in wastewater treatment plants: A review of the different approaches to limit their release in the environment
This review examines how wastewater treatment plants handle microplastics, finding that while some plants remove up to 99% of microplastics from water, they concentrate the removed plastics in sewage sludge. When that sludge is spread on farmland as fertilizer, over 65% of the captured microplastics can re-enter the environment and potentially contaminate crops and groundwater. The authors argue that treatment plants should be reimagined as key barriers against microplastic pollution, with targeted technologies added at strategic points in the treatment process.
Sewage sludge as a source of microplastics in the environment: A review of occurrence and fate during sludge treatment
This review assessed how wastewater treatment plants concentrate microplastics from influent into sludge, estimating that sewage sludge applied to agricultural land represents a major secondary pathway for MPs entering terrestrial ecosystems, with estimated releases of millions to billions of particles per hectare.
The course of microplastics before and after UK WWTPs and their release into the environment.
This study tracked microplastics through UK wastewater treatment plants from influent to effluent and biosolids, finding that while treatment removes the majority of microplastics from the water stream, significant quantities are concentrated in biosolids spread on agricultural land.
Investigation and analysis of microplastics in sewage sludge and biosolids: A case study from one wastewater treatment works in the UK (article)
This UK case study tracked microplastics through an entire sewage sludge treatment stream at one wastewater works, from raw influent through to biosolids applied to agricultural land. Microplastics were present at every stage and concentrated in biosolids, suggesting land application of biosolids is a significant pathway for introducing microplastics into agricultural soils.
Behavior and flow of microplastics during sludge treatment in Japan
Sampling of two Osaka wastewater treatment plants found microplastics at every stage of the sludge treatment process, with 13 polymer types identified; concentration increased through dewatering, but the total MP load in final biosolids was lower than in raw sludge.
Fate of Microplastic Pollution Along the Water and Sludge Lines in Municipal Wastewater Treatment Plants
Researchers evaluated microplastic abundance and distribution across three municipal wastewater treatment plants using different treatment technologies. The study found that all three plants achieved greater than 97% microplastic removal along the water treatment line, with microplastics concentrating in the sludge fraction, underscoring the important role of sludge treatment in sequestering microplastics from wastewater.
Fate of microplastics in sewage sludge and in agricultural soils
Researchers reviewed how microplastics accumulate in sewage sludge at wastewater treatment plants and then spread into agricultural soils when that sludge is applied as fertilizer, finding that sludge treatment processes can alter microplastic size and shape but do not eliminate them. The review calls for standardized methods to study how different sludge treatments affect microplastic properties and their downstream risks to soil health.
[Microplastics in wastewater treatment: current status and future trends].
This review summarizes current research on microplastic occurrence, removal, and fate in wastewater treatment plants, noting that while plants capture most microplastics in activated sludge, significant numbers still escape into effluent. The sludge itself then becomes a major pathway for microplastics to enter agricultural soils when applied as fertilizer. Future treatment improvements and sludge management policies are needed to reduce these release pathways.
Microplastics removal from a primary settler tank in a wastewater treatment plant and estimations of contamination onto European agricultural land via sewage sludge recycling
Researchers found that primary settling in wastewater treatment removes significant microplastics from sewage, but these particles concentrate in sludge that is often recycled onto agricultural land, creating a pathway back into the environment.
Approaching the environmental problem of microplastics: Importance of WWTP treatments
This review examines the role of wastewater treatment plants as sources and sinks of microplastics, noting that while treatment removes significant quantities, remaining particles concentrate in sewage sludge which is then applied to agricultural land as fertilizer. The authors survey available technologies for improving microplastic removal and call for better policy to address this gap.
An audit of microplastic abundance throughout three Australian wastewater treatment plants
Microplastic abundance was audited throughout three Australian wastewater treatment plants, tracking particles from influent through all treatment stages and into both effluent and biosolids. While treatment removed most microplastics from effluent, the majority were captured in biosolids — which are often land-applied — highlighting biosolids as the primary pathway for microplastics leaving wastewater treatment systems.
Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants
This review finds that wastewater treatment plants effectively transfer microplastics from effluent into sewage sludge, creating a significant but underrated pathway for MP contamination when sludge is applied to agricultural soils.
Microplastics in Sewage Sludge: A review
This review examines the presence and fate of microplastics in sewage sludge from municipal wastewater treatment plants, a topic that has received less attention than microplastics in the water treatment line. The study highlights that agricultural application of sewage sludge is a primary source of microplastic contamination in soils, and provides a comprehensive overview of detection methods, concentrations, and the environmental implications of sludge-borne microplastics.