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Microplastics separation in reject water from wastewater sludge treatment line using micro and ultrafiltration membranes
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Wastewater treatment plants can accidentally recirculate tiny plastic particles back into the water they're processing, meaning microplastics can build up over time instead of being removed. This study found that a specific filtering membrane (called UH050) can effectively strain out these microplastics while still allowing valuable nutrients to pass through for reuse as fertilizer, offering a practical way to keep more plastic out of treated water before it re-enters our environment and water supply.
Microplastics (MPs) and other microparticles (MPr) in wastewater sludge streams represent a challenge in wastewater treatment plants (WWTPs). Some of these MPr accumulate when reject clarified streams are recycled to the plant inlet. This study evaluates the performance of ultrafiltration (UF) and microfiltration (MF) membranes for MPr removal and nutrient preservation from two sludge-derived streams: Primary Sludge Liquor (PSL) and Digestate Centrate (DC). Three membranes (UH050, V6, and V0.2) were tested under total recycling and variable concentration modes. For PSL, the UH050 membrane showed superior overall performance by combining stable operating permeate flux (15 L·m −2 ·h −1 ), efficient MPr retention, and negligible NH 4 + -N and PO 4 3- -P retention. Moreover, it showed excellent cleanability, with > 90% permeability recovery after alkaline cleaning. For DC, all membranes achieved high MPr retention in the permeate, though no significant accumulation was observed in the retentate. Again, UH050 provided the lowest rejection of NH 4 + -N (15%) and PO₄³ ⁻-P (almost insignificant), with good cleaning efficiency. Overall, UH050 was identified as the most reliable option for PSL, and DC combining MPr removal, nutrient selectivity, hydraulic stability, and cleanability. These findings support the implementation of membrane-based solutions for MPs control and nutrient recovery in sludge lines, contributing to resource efficiency and circular economy in WWTP.
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Microplastics separation in reject water from wastewater sludge treatment line using micro and ultrafiltration membranes.
AI summary Read the abstract
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Microplastics separation in reject water from wastewater sludge treatment line using micro and ultrafiltration membranes.
AI summary Read the abstract
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Recycling plastic bottles and manufacturing textiles releases huge amounts of tiny plastic particles into wastewater—thousands per liter—which could eventually make their way into our water supply and environment if not filtered out properly. The good news: this study found that special filtering membranes can effectively strip out these microplastics, offering a practical way to keep them from spreading further, though the filters still need regular cleaning since oily/organic gunk clogs them faster than the plastic bits do.
Removal of microplastics from urban WWTP effluent: Ultrafiltration tertiary treatment combined with anaerobic digestion
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Scientists tested a filtering technology that can completely strip microplastics out of treated wastewater before it's released into rivers and streams, good news for reducing plastic pollution in our water. But there's a catch: those captured microplastics don't fully break down during the sludge treatment process afterward, meaning the leftover material (often used as fertilizer) ends up with much higher plastic concentrations. This suggests we need better solutions for what happens to microplastics *after* they're removed from water, especially if that leftover sludge is being spread on farmland where it could re-enter our food system.
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Researchers discovered that the plastic membrane filters used to purify drinking water can actually release microplastics into the treated water. The particles came not just from the membrane itself but also from plastic equipment in the system, meaning that water treatment technology designed to remove contaminants may inadvertently be adding new plastic particles to our drinking water.
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