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Nationwide characterization of microplastics in sewage sludge as a baseline for sludge quality assessment and valorization planning.
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Researchers tested sewage sludge from 65 wastewater treatment plants across Taiwan and found microplastics in every sample, mostly tiny plastic fragments made of polyethylene and polypropylene. Higher microplastic levels were linked to more lead and manganese, and risk assessments classified all the sludge as polluted, with most plants rated heavily or extremely polluted.
Wastewater treatment plants (WWTPs) are recognized as major sinks for microplastics (MPs), transferring a substantial proportion of particles from wastewater to sewage sludge. However, nationwide assessments of MP contamination in sewage sludge remain scarce. This study investigated the occurrence, characteristics, diversity, and environmental risks of MPs in sewage sludge collected from 65 municipal WWTPs across Taiwan. MP concentrations ranged from 76 × 103 to 519 × 103 items/kg dry weight, with an average concentration of 224 × 103 ± 104 × 103 items/kg. Polyethylene (4.3-99.1 %) and polypropylene (0-87.5 %) dominated the polymer composition, while fragments (46.9-94.2 %) and particles between 51 and 300 μm represented the predominant morphological fractions. Microplastic abundance was positively correlated with the smallest particle size fraction (25-50 μm), overall particle diversity, ash content, and Pb and Mn concentrations, indicating the co-accumulation of particulate contaminants and increasing heterogeneity with higher contamination levels. Environmental risk assessment demonstrated that all sewage sludge samples were classified as polluted, with most WWTPs falling into heavily or extremely polluted categories according to the Pollution Load Index. Furthermore, elevated Polymeric Hazard Index and Potential Ecological Risk values highlighted considerable environmental risks associated with sewage sludge. These findings demonstrate that sewage sludge represents an important reservoir of microplastics and associated contaminants. As Taiwan continues to promote circular economy strategies and resource recovery from sewage sludge, future sludge management should incorporate microplastic abundance and polymer-specific hazards alongside conventional pollutants to ensure environmentally sustainable sludge reuse.
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[Occurrence Characteristics and Ecological Risk Assessment of Microplastics in Sewage Sludge across China].
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Researchers found high levels of tiny plastic particles (microplastics) in sewage sludge across China, and their analysis shows this pollution poses a serious risk to the environment. This matters because sludge is often used as fertilizer on farmland, meaning these microplastics could end up in our soil, water, and potentially the food we eat—making better waste treatment and pollution controls an important public health priority.
Microplastics in sewage sludge from the wastewater treatment plants in China
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Researchers analyzed microplastics in sewage sludge from wastewater treatment plants across China, finding high concentrations of microplastics — predominantly fibers and fragments — raising concerns about their spread when sludge is applied to agricultural land.
Investigation of microplastics in sludge from five wastewater treatment plants in Nanjing, China
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Microplastics were characterized in sludge from five wastewater treatment plants in Nanjing, China, with concentrations ranging widely across facilities and fibers as the dominant shape, highlighting sludge as a major reservoir and potential environmental release point for microplastic pollution.
Combined application of analytical techniques for microplastic determination to achieve comprehensive results for sewage sludge samples
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Researchers combined multiple analytical techniques for comprehensive microplastic determination in sewage sludge samples, addressing the challenge that more than 90% of microplastics entering wastewater treatment plants are retained in sludge and require robust multi-method characterization.
Microplastics in wastewater treatment plants and their contributions to surface water and farmland pollution in China
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Researchers examined microplastic abundance in sewage and sludge at Shenzhen wastewater treatment plants, estimating that annual microplastic loading from WWTPs to surface water and farmland soil across China is substantial. WWTPs concentrate microplastics in sludge, which then becomes a major pathway for plastic contamination of agricultural land when applied as fertilizer.
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