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Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants

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  • Maria Cristina Collivignarelli

    (Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 3, 27100 Pavia, Italy
    Interdepartmental Centre for Water Research, University of Pavia, via Ferrata 3, 27100 Pavia, Italy)

  • Marco Carnevale Miino

    (Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 3, 27100 Pavia, Italy)

  • Francesca Maria Caccamo

    (Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 3, 27100 Pavia, Italy)

  • Chiara Milanese

    (C.S.G.I. & Department of Chemistry, Physical Chemistry Section, University of Pavia, viale Taramelli 16, 27100 Pavia, Italy)

Abstract

Interest in the presence of microplastics (MPs) in wastewater has grown significantly in recent years. In fact, wastewater treatment plants (WWTPs) represent the last barrier before the discharge of MPs into an aquatic ecosystem. The research has highlighted how MPs are in part effectively removed from the waters and accumulated inside the sewage sludge (SeS) produced by the WWTP, being a cause for concern, especially in the case of agricultural reuse. This work aims to analyze the existing literature on the (i) methodical procedure for MPs analysis (thermal, spectroscopic, optical analyses), (ii) qualitative and quantitative presence of MPs in SeS, (iii) effect on sludge properties, and (iv) the possible accumulation in amended soils. Based on the results already obtained in the literature, this work aims to provide critical insights to stimulate interest in the topic and direct future research on aspects that should be deepened. In particular, it emerges that there is a clear need for standardization of the collection methods and the analytical techniques for identifying and quantifying MPs, since their physico-chemical characterization and the study on aging and on the response towards acid or basic pre-treatments are fundamental for the understanding of microplastics ecotoxicological potential.

Suggested Citation

  • Maria Cristina Collivignarelli & Marco Carnevale Miino & Francesca Maria Caccamo & Chiara Milanese, 2021. "Microplastics in Sewage Sludge: A Known but Underrated Pathway in Wastewater Treatment Plants," Sustainability, MDPI, vol. 13(22), pages 1-23, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:22:p:12591-:d:679499
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    References listed on IDEAS

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    1. Matthew J Page & Joanne E McKenzie & Patrick M Bossuyt & Isabelle Boutron & Tammy C Hoffmann & Cynthia D Mulrow & Larissa Shamseer & Jennifer M Tetzlaff & Elie A Akl & Sue E Brennan & Roger Chou & Jul, 2021. "The PRISMA 2020 statement: An updated guideline for reporting systematic reviews," PLOS Medicine, Public Library of Science, vol. 18(3), pages 1-15, March.
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    Cited by:

    1. Mengbo Huang & Dongqi Wang & Shengwei Zhang & Yuzhu Weng & Kailong Li & Renjie Huang & Yuan Guo & Chunbo Jiang & Zhe Wang & Hui Wang & Haiyu Meng & Yishan Lin & Mingliang Fang & Jiake Li, 2023. "Impacts of Polylactic Acid Microplastics on Performance and Microbial Dynamics in Activated Sludge System," Sustainability, MDPI, vol. 15(19), pages 1-16, September.

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