Abstract
Microplastics (MPs) are unregulated and emerging contaminants, which are continuously released due to human activities in the environment through several pathways. The presence of MPs poses threats to the environment, organisms, and human health. The discharge of treated effluent from wastewater treatment plants (WWTPs) is a major source of MP input, especially in the form of microfibers, into the aquatic environment, whereas the application of sludge and compost is a crucial pathway transferring MPs to terrestrial environment. Meanwhile, MPs are produced from industrial processes and the use of plastic consumer goods and personal care products. MPs become more hazardous when they adsorb persistent organic pollutants and heavy metals or attach with pathogenic microorganisms from wastewater and sludge. However, there is little comprehensive information available about the collaborative role of wastewater and sludge in MP contamination. Studies about remediation strategies and their removal mechanisms of MPs in WWTPs are limited. Therefore, it is important to develop cost-effective detection methods of MPs for routine monitoring in wastewater and sludge samples and understanding of fate and inhibitory effects of MPs in wastewater and sludge treatment processes, before developing the mitigation measures of MP contamination. This chapter summarizes the sources and pathways of MPs, discusses the impacts of MPs on environment and human health, and reviews the current practices on detection, quantification, and qualification of MPs. In addition, this chapter provides insights into the source control of MPs through polices and education.
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This work was supported by the Research Grants Council of the Hong Kong SAR, China (No. 18202116), the Departmental Collaborative Fund (No. 04488), Internal Research Grant (No. RG38/2019-2020R), and Dean’s Research Fund (Nos. IRS13/ROP10/RMP5) of The Education University of Hong Kong, and the State Key Laboratory of Marine Pollution (SKLMP) Seed Collaborative Research Fund (No. SCRF/0026).
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Khan, M.T., Cheng, Y.L., Hafeez, S., Tsang, Y.F., Yang, J., Nawab, A. (2020). Microplastics in Wastewater. In: Rocha-Santos, T., Costa, M., Mouneyrac, C. (eds) Handbook of Microplastics in the Environment. Springer, Cham. https://doi.org/10.1007/978-3-030-10618-8_39-1
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