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Insights into the role of attapulgite clay on the efficient removal of microplastics by sand filters in various waters
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Application of Clay Composites for Microplastics Removal from Environment
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Researchers reviewed how clay-based composites and nanocomposites can effectively capture and remove microplastics from water and soil environments. These low-cost, naturally abundant materials show promise as practical tools for filtering microplastic contamination at scale, though further optimization is needed for widespread application.
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Sand filters in wastewater treatment plants reduced the mass of microplastics in effluent but increased the count of smaller particles, suggesting filtration fragments larger pieces rather than eliminating microplastics entirely. This finding indicates that conventional sand filtration is insufficient for microplastic removal and may inadvertently increase the release of smaller, potentially more bioavailable particles into freshwater streams.
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Researchers tested common household water filters for their ability to reduce microplastic contamination in drinking water, finding that even simple, low-cost filtration methods meaningfully decreased microplastic levels and could serve as a practical tool for reducing daily human exposure.
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Tertiary filtration at wastewater treatment plants—using sand or cloth filters—was tested at five Illinois facilities and found to significantly reduce microplastic concentrations in effluent, with cloth filtration outperforming sand filtration for finer particles. Since wastewater effluent is a major pathway for microplastics to enter rivers and streams, upgrading treatment plants with effective tertiary filtration could substantially reduce environmental contamination.
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Wastewater treatment plants in Poland were found to remove about 95-99% of microplastic particles from sewage before it's released into rivers and streams, with most of the trapped plastic ending up concentrated in the leftover sludge. That's good news since it means treatment plants are catching most microplastics before they reach waterways, but it also means the sludge, which is sometimes used as fertilizer on farmland, may need more scrutiny to prevent these particles from re-entering the environment and, potentially, our food supply.
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