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Article

Removal Effectiveness of Nanoplastics (<400 nm) with Separation Processes Used for Water and Wastewater Treatment

Department of Civil and Environmental Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada
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Water 2020, 12(3), 635; https://doi.org/10.3390/w12030635
Received: 12 January 2020 / Revised: 19 February 2020 / Accepted: 23 February 2020 / Published: 26 February 2020
(This article belongs to the Special Issue Emerging Contaminants in Water: Detection, Treatment, and Regulation)
Microplastics and nanoplastics are abundant in the environment, and the fate and impact of nanoplastics are of particular interest because of their small size. Wastewater treatment plants are a sink for nanoplastics, and large quantities of nanoplastics are discharged into surface waters through wastewater as well as stormwater effluents. There is a need to understand the fate and removal of nanoplastics during water, wastewater, and stormwater treatment, and this study investigated their removal on a bench-scale using synthesized nanoplastics (<400 nm) to allow controlled experiments. Plastic particles were created in the lab to control their size, and bench-scale dewatering devices were tested for their ability to remove these particles. Filtration with a 0.22 μm filter removed 92 ± 3% of the particles, centrifugation at 10,000 rpm (670,800 g) for 10 min removed 99 ± 1% of the particles, and ballasted flocculation removed 88 ± 3%. These results provide a general idea of the magnitude of the removal of nanoplastics with separation processes, and more work is recommended to determine the degree of removal with full-scale unit processes. Even though the removal was good using all three treatments, smaller particles escaping treatment may increase the nanoplastics concentration of receiving water bodies and impact aquatic ecosystems. View Full-Text
Keywords: nanoplastics; microplastics; wastewater; removal; settling; centrifugation; filtration nanoplastics; microplastics; wastewater; removal; settling; centrifugation; filtration
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MDPI and ACS Style

Murray, A.; Örmeci, B. Removal Effectiveness of Nanoplastics (<400 nm) with Separation Processes Used for Water and Wastewater Treatment. Water 2020, 12, 635. https://doi.org/10.3390/w12030635

AMA Style

Murray A, Örmeci B. Removal Effectiveness of Nanoplastics (<400 nm) with Separation Processes Used for Water and Wastewater Treatment. Water. 2020; 12(3):635. https://doi.org/10.3390/w12030635

Chicago/Turabian Style

Murray, Audrey; Örmeci, Banu. 2020. "Removal Effectiveness of Nanoplastics (<400 nm) with Separation Processes Used for Water and Wastewater Treatment" Water 12, no. 3: 635. https://doi.org/10.3390/w12030635

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