Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant
Salmi, P., Ryymin, K., Karjalainen, A. K., Mikola, A., Uurasjärvi, E., & Talvitie, J. (2021). Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant. Water Science and Technology, 84(1), 89-100. https://doi.org/10.2166/wst.2021.209
Published inWater Science and Technology
© 2021 The Authors
Microplastics (MPs) from households, stormwater, and various industries are transported to wastewater treatment plants (WWTPs), where a high proportion of them are captured before discharging their residuals to watersheds. Although recent studies have indicated that the removed MPs are mainly retained in wastewater sludge, sludge treatment processes have gained less attention in MP research than water streams at primary, secondary, and tertiary treatments. In this study, we sampled twelve different process steps in a tertiary-level municipal WWTP in central Finland. Our results showed that, compared to the plant influent load, three times more MPs circulated via reject water from the sludge centrifugation back to the beginning of the treatment process. Especially fibrous MPs were abundant in the dewatered sludge, whereas fragment-like MPs were observed in an aqueous stream. We concluded that, compared to the tertiary effluent, sludge treatment is the major exit route for MPs into the environment, but sludge treatment is also a return loop to the beginning of the process. Our sampling campaign also demonstrated that WWTPs with varying hydraulic conditions (such as the one studied here) benefit from disc filter–based tertiary treatments in MP removal. ...
Dataset(s) related to the publicationhttp://urn.fi/URN:NBN:fi:jyu-202009035741
Salmi, Pauliina; Ryymin, Kalle; Karjalainen, Anna; Mikola, Anna; Uurasjärvi, Emilia; Talvitie, Julia (2020). Original data for article: Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant. V. 1.9.2020. https://jyx.jyu.fi/handle/123456789/71624. https://doi.org/10.17011/jyx/dataset/71624
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Additional information about fundingThis study was funded by Jyväskylän Seudun Puhdistamo Ltd, which operates the Nenäinniemi WWTP. Maaja Vesitekniikan Tuki Ry supported the writing of this manuscript.
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