Optical Monitoring of Microplastics Filtrated from Wastewater Sludge and Suspended in Ethanol
Asamoah, B. O., Salmi, P., Räty, J., Ryymin, K., Talvitie, J., Karjalainen, A. K., Kukkonen, J. V. K., Roussey, M., & Peiponen, K.-E. (2021). Optical Monitoring of Microplastics Filtrated from Wastewater Sludge and Suspended in Ethanol. Polymers, 13(6), Article 871. https://doi.org/10.3390/polym13060871
© 2021 the Authors
The abundance of microplastics (MPs) in the atmosphere, on land, and especially in water bodies is well acknowledged. In this study, we establish an optical method based on three different techniques, namely, specular reflection to probe the medium, transmission spectroscopy measurements for the detection and identification, and a speckle pattern for monitoring the sedimentation of MPs filtrated from wastewater sludge and suspended in ethanol. We used first Raman measurements to estimate the presence and types of different MPs in wastewater sludge samples. We also used microscopy to identify the shapes of the main MPs. This allowed us to create a teaching set of samples to be characterized with our optical method. With the developed method, we clearly show that MPs from common plastics, such as polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), and polyethylene (PE), are present in wastewater sludge and can be identified. Additionally, the results also indicate that the density of the plastics, which influences the sedimentation, is an essential parameter to consider in optical detection of microplastics in complex natural environments. All of the methods are in good agreement, thus validating the optics-based solution. ...
Publication in research information system
MetadataShow full item record
Additional information about fundingThe work is part of the Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN), decision 320166.
Showing items with similar title or keywords.
Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant Salmi, Pauliina; Ryymin, Kalle; Karjalainen, Anna K.; Mikola, Anna; Uurasjärvi, Emilia; Talvitie, Julia (IWA Publishing, 2021)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. ...
Aalto, Sanni L.; Saarenheimo, Jatta; Ropponen, Janne; Juntunen, Janne; Rissanen, Antti; Tiirola, Marja (IWA Publishing, 2018)Sediment microbes have a great potential to transform reactive N to harmless N2, thus decreasing wastewater nitrogen load into aquatic ecosystems. Here, we examined if spatial allocation of the wastewater discharge by a ...
Siitonen, Anni (University of Jyväskylä, 2010)The unique nature of optical properties of single-walled carbon nanotubes (SWCNT), together with their promising potential applications, have created enormous interest towards the photophysics of SWCNT. Many aspects ...
Occurrence of antibiotics and risk of antibiotic resistance evolution in selected Kenyan wastewaters, surface waters and sediments Kairigo, Pius; Ngumba, Elijah; Sundberg, Lotta-Riina; Gachanja, Anthony; Tuhkanen, Tuula (Elsevier, 2020)Active pharmaceutical ingredients, especially antibiotics, are micropollutants whose continuous flow into hydrological cycles has the potential to mediate antibiotic resistance in the environment and cause toxicity to ...
Räsänen, Aleksi; Tolvanen, Anne; Kareksela, Santtu (Elsevier, 2022)Peatland water table depth (WTD) and wetness have widely been monitored with optical and synthetic aperture radar (SAR) remote sensing but there is a lack of studies that have used multi-sensor data, i.e., combination of ...