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Quantifying and identifying microplastics in the effluent of advanced wastewater treatment systems using Raman microspectroscopy
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Researchers developed a new method combining chemical digestion and Raman microspectroscopy to identify and quantify microplastics in advanced wastewater treatment effluents, finding large numbers of particles smaller than 10 μm in reverse osmosis, nanofiltration, and activated carbon filtration outputs with polyethylene as the most common polymer.
Microplastics in wastewater treatment plant (WWTP) effluent have been identified and quantified, but few studies have examined the microplastics in advanced treatment systems. A new method for isolating, quantifying, and determining the polymer type of microplastics was developed that included chemical digestion coupled with Raman microspectroscopy to investigate microplastics in the effluent of reverse osmosis nanofiltration and activated carbon filtration systems. This method allows for the removal of organics and the quantification and identification of all microplastics present in the sample. A large number of microplastics, the majority of which were smaller than 10 μm, were identified in the effluent of the advanced filtration systems with polyethylene the most common polymer identified. This study not only reports a new method for microplastic identification and quantification but also shows the importance of measuring the smallest fraction of microplastics, those smaller than 20 μm, which have previously been understudied.
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Researchers analyzed microplastics in wastewater and sewage sludge from a treatment plant in Ioannina, Greece, using micro-Raman spectroscopy. They found microplastics of various shapes, sizes, and polymer types throughout the plant, with fibers and fragments being the most common forms. The study highlights that wastewater treatment plants remain a significant pathway for microplastic release into aquatic and terrestrial environments.
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Researchers developed engineered approaches using Raman spectroscopy and automated image analysis to identify tiny microplastics retained in polymeric and ceramic membranes from wastewater treatment, enabling more precise assessment of membrane performance and microplastic removal efficiency.
Determination of the microplastics emission in the effluent of a municipal waste water treatment plant using Raman microspectroscopy
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Raman microspectroscopy was used to measure microplastic concentrations in the effluent of a wastewater treatment plant in Germany, finding that even after secondary treatment, thousands of microplastic particles per day were discharged into the receiving water body. The study underscores that conventional wastewater treatment is insufficient to prevent microplastics from entering aquatic environments.
Investigation of microplastics in advanced biological wastewater treatment plant effluent
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Researchers investigated the presence and characteristics of microplastics in the effluent of an advanced biological wastewater treatment plant. They found that microplastics persist even after advanced treatment processes, though the specific types and sizes varied. The study underscores the need for standardized methods to sample, identify, and quantify microplastics in wastewater streams.
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