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Purifying or polluting? Tracing membrane-based microplastics release for long-term drinking water safety
Summary
This study investigated whether the polymeric membranes used in drinking water filtration systems might themselves release microplastics, and researchers found that chemical cleaning and pre-oxidation treatments significantly increased particle shedding. Most released particles were in the concerning 1-to-5 micrometer size range, though the research also identified operating conditions under which membrane systems remain effective net purifiers over time.
Microplastics (MPs), recognized as a growing threat to human health due to their bioaccumulative potential, necessitate urgent investigation of exposure pathways. Drinking water treatment, particularly membrane filtration designed to ensure safety, presents a paradoxical risk: polymeric membranes themselves may release MPs when subjected to specific stresses, potentially offsetting part of the purification benefit. To address this critical knowledge gap, this study systematically quantified and characterized MPs release from three representative membrane materials under simulated drinking water treatment conditions, specifically pre-oxidation and chemical cleaning. Results demonstrate that both processes substantially exacerbate MPs generation, primarily through induced physicochemical degradation of membrane polymers. Distinct differences in release profiles across membrane types underscore the influence of material-specific susceptibility and degradation pathways, emphasizing the pivotal role of membrane selection in mitigation strategies. Crucially, the predominance of released MPs fell within the 1-5 µm safety-sensitive size class, which was consistently observed across conditions in this study. By interpreting these intrinsic release patterns within realistic plant-scale operating windows, this work clarifies how membrane-derived MPs relate to overall removal and identifies operating conditions under which membrane processes remain net purifying over time. This work provides fundamental insights into the mechanisms of secondary MPs contamination originating from water treatment membranes, highlighting the importance of material choice, chemical exposure conditions and operational control in limiting membrane-derived MPs release and ensuring sustainable drinking water safety.