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Enhanced Removal of Very Small Microplastics (1-5 Μm) from Secondary-Treated Wastewater Using Spent Coffee Grounds Biochar: Application of Flow Cytometry
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Enhanced removal of small microplastics (1–5 μm) from secondary-treated wastewater using Spent Coffee Grounds biochar: Application of flow cytometry
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Researchers found that biochar made from spent coffee grounds — a waste product — can remove nearly 100% of microplastics 2 micrometers and larger from treated wastewater, and about 49% of the smallest 1-micrometer particles. This low-cost, sustainable filter material significantly outperformed traditional sand filters, with fewer than 1.5% of trapped particles escaping during backwashing.
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This study investigated agricultural waste-derived biochar as a low-cost adsorbent for removing microplastics from water and wastewater, evaluating its effectiveness as an emerging treatment approach. Biochar offers a sustainable, circular-economy solution for microplastic removal by converting agricultural residues into functional treatment materials, potentially reducing costs compared to conventional engineered sorbents.
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