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Microplastics in Sewage Sludge of Wastewater Treatment
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This review chapter examines microplastics in sewage sludge from wastewater treatment plants, where plastic particles concentrate after being filtered from wastewater. When sludge is applied to agricultural land or sent to landfill, those microplastics can re-enter the environment and affect soil health and surrounding ecosystems.
Wastewater treatment plants (WWTPs) have been regarded as vital sinks and sources of microplastics from urban waters to the environment. Microplastics could be removed and migrated to the sewage sludge in the WWTPs. The microplastics accumulated in sludge are documented to have different effects on sludge anaerobic treatment systems and create certain risks for surrounding organisms after land application and landfills of sludge. To understand the role of microplastics in the sewage sludge treatment and evaluate their potential risk for discharge, this chapter will 1) investigate the occurrence of microplastics in various types of sewage sludge including primary sludge, waste-activated sludge and dewatered sludge; 2) understand the role and mechanisms of microplastics in the sludge anaerobic treatment process; 3) discuss the potential risk of microplastics from sludge to soil and landfill; and 4) compare the microplastic removal from sludge with various sludge treatment technologies. The outlooks of microplastics in sewage sludge are then finally proposed.
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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.
A Review of Microplastic Contamination in WastewaterDerived Sewage Sludge
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A review of wastewater treatment plant research reveals that while these facilities remove up to 99% of microplastics from effluent water, the captured particles concentrate in sewage sludge that is then spread on agricultural land as fertilizer, creating a critical terrestrial contamination pathway. The lack of standardized detection methods, long-term soil studies, and effective removal technologies means microplastic-laden sludge represents a largely unregulated route of environmental and dietary human exposure.
Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants
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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: Captured but released?
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This book chapter reviews how wastewater treatment plants capture microplastics from sewage but then release them back into the environment through the application of sewage sludge to agricultural land. Treating sewage sludge as a microplastic disposal route transfers the pollution problem from water to soil.
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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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.