Water quality
WWTPs cut plastic mass but leak nanoplastics
Open access · cc by · source: Europe PMC
Two Chinese plants dropped MP/NP mass from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent, with nanoplastics removed least.
Key findings
Plant A influent 26.23 μg/L fell to 1.75 μg/L after tertiary treatment; plant B 11.29 to 0.71 μg/L. PP, PET, and PE dominated. Size-class removal was ~93% for 50–1000 μm in one plant, but only 78.09% for 0.01–1 μm in plant B.
Methodology
Authors quantified six polymers (0.01–1000 μm) by pyrolysis GC/MS in influent and primary/secondary/tertiary effluent of two WWTPs, splitting size classes 50–1000, 1–50, and 0.01–1 μm.
Limitations
Two plants in one country; mass methods miss some polymers; particle-number studies are not directly comparable. The work does not measure ecological harm of the residual effluent load.
How this study connects
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Evidence for the claim as stated.
Two Chinese plants dropped MP/NP mass from 26.23 and 11.29 μg/L in influent to 1.75 and 0.71 μg/L in tertiary effluent, with nanoplastics removed least.
Evidence for the claim as stated.
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