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How well is microlitter purified from wastewater? – A detailed study on the stepwise removal of microlitter in a tertiary level wastewater treatment plant

Open access
Talvitie, Julia, Mikola, Anna, Setälä, Outi, Heinonen, Mari, Koistinen, Arto·2017·Water Research

Abstract

Wastewater treatment plants (WWTPs) can offer a solution to reduce the point source input of microlitter and microplastics into the environment. To evaluate the contributing processes for microlitter removal, the removal of microlitter from wastewater during different treatment steps of mechanical, chemical and biological treatment (activated sludge) and biologically active filter (BAF) in a large (population equivalent 800 000) advanced WWTP was examined. Most of the microlitter was removed already during the pre-treatment and activated sludge treatment further decreased the microlitter concentration. The overall retention capacity of studied WWTP was over 99% and was achieved after secondary treatment. However, despite of the high removal performance, even an advanced WWTP may constitute a considerable source of microlitter and microplastics into the aquatic environment given the large volumes of effluent discharged constantly. The microlitter content of excess sludge, dried sludge and reject water were also examined. According to the balance analyses, approximately 20% of the microlitter removed from the process is recycled back with the reject water, whereas 80% of the microlitter is contained in the dried sludge. The study also looked at easy microlitter sampling protocol with automated composite samplers for possible future monitoring purposes.

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Metadata

Authors
Talvitie, J., Mikola, A., Setälä, O., Heinonen, M., & Koistinen, A.
Venue
Water Research
Publisher
Elsevier BV
Published
2017-02
Volume
109
Pages
164-172
ISSN
0043-1354 (ISSN-L)
OpenAlex
W2550626179
Cited by
773
References
22
FWCI
16.80
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: How well is microlitter purified from wastewater? – A detailed study on the stepwise removal of microlitter in a tertiary level wastewater treatment plant. https://app.cochat.ai/papers/10.1016/j.watres.2016.11.046
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Talvitie, J., Mikola, A., Setälä, O., Heinonen, M., & Koistinen, A. (2017). How well is microlitter purified from wastewater? – A detailed study on the stepwise removal of microlitter in a tertiary level wastewater treatment plant. Water Research. https://doi.org/10.1016/j.watres.2016.11.046

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