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Microplastics in sewage sludge: Captured but released?

IWA Publishing eBooks 2019 9 citations

AI summary Read the abstract

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.

Body Systems
Study Type Environmental

This book covers the topic of microplastics in water and wastewater. The chapters start with introductory issues related to the growing interest in the scientific community on microplastics and the human water cycle and point out where the microplastics could interact with water. The subsequent chapters examine evidence of the microplastic presence in freshwater, such as in both rivers and lakes, in freshwater biota, and hazardous chemicals associated with microplastics in such systems.Another set of chapters discuss the presence of microplastics in wastewater: their sources; their transfer through a wastewater treatment plant; the concentration of microplastics in effluents throughout the world; the plastic biomedia used in wastewater treatment plants and the effect on the surrounding environment of effluent wastewater pipes. These chapters also discuss the sampling methods, the sample treatment and analysis techniques used so far for microplastics in wastewater. Additionally, the presence of microplastics in sewage sludge and in soils irrigated with wastewater or fertilized with sludge are discussed. The possible impact of plastics and their additives on plants, microalgae, and humans are reviewed and presented in a critical way. Finally, a chapter summarizes all the relevant regulations and initiatives that point to the necessity of a global directive for the protection of the environment from plastic and microplastic pollution.The topic of microplastics in freshwater systems and in wastewater has scarcely been studied and requires more attention. Microplastics in Water and Wastewater aims to bring these initial findings to the attention of a broader audience and especially to operators and managers of freshwater and wastewater systems. It will also be helpful to people already aware of the marine debris problem to understand the sources of microplastics in the oceans, from freshwater systems and wastewater treatment plants."All in all, the book is recommended for researchers and policymakers in the fields of environmental chemistry, civil engineering, city planning, waste management and toxicology. Furthermore, it is also worthwhile for those who are concerned about the effects of microplastics on biota and on humans."Professor Hideshige Takada, Laboratory of Organic Geochemistry (LOG), Tokyo University of Agriculture and Technology, International Pellet WatchISBN: 9781789060027 (print)ISBN: 9781789060034 (eBook)ISBN: 9781789060041 (ePUB)

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Article Tier 2

Microplastics in sewage sludge: Captured but released?

AI summary Read the abstract

This book chapter examines how wastewater treatment plants capture microplastics from sewage but then concentrate them into sludge, which may subsequently be spread on agricultural land. The chapter highlights how treating wastewater can shift — rather than eliminate — microplastic contamination, moving it from water systems into terrestrial environments.

Article Tier 2

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.

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Sewage sludge as a source of microplastics in the environment: A review of occurrence and fate during sludge treatment

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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.

Article Tier 2

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.

Article Tier 2

[Microplastics in wastewater treatment: current status and future trends].

AI summary Read the abstract

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.

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