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Microplastic Removal from Drinking Water Using Point-of-Use Devices
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Researchers tested common household water filter pitchers to see how well they remove microplastics from drinking water. Filters using microfiltration technology removed 78-100% of plastic particles, while one filter using only activated carbon and ion exchange actually released more particles than it captured. The study suggests that point-of-use water filters with microfiltration can meaningfully reduce microplastic exposure from tap water.
The occurrence of microplastics in drinking water has drawn increasing attention due to their ubiquity and unresolved implications regarding human health. Despite achieving high reduction efficiencies (70 to >90%) at conventional drinking water treatment plants (DWTPs), microplastics remain. Since human consumption represents a small portion of typical household water use, point-of-use (POU) water treatment devices may provide the additional removal of microplastics (MPs) prior to consumption. The primary objective of this study was to evaluate the performance of commonly used pour-through POU devices, including those that utilize combinations of granular activated carbon (GAC), ion exchange (IX), and microfiltration (MF), with respect to MP removal. Treated drinking water was spiked with polyethylene terephthalate (PET) and polyvinyl chloride (PVC) fragments, along with nylon fibers representing a range of particle sizes (30-1000 µm) at concentrations of 36-64 particles/L. Samples were collected from each POU device following 25, 50, 75, 100 and 125% increases in the manufacturer's rated treatment capacity, and subsequently analyzed via microscopy to determine their removal efficiency. Two POU devices that incorporate MF technologies exhibited 78-86% and 94-100% removal values for PVC and PET fragments, respectively, whereas one device that only incorporates GAC and IX resulted in a greater number of particles in its effluent when compared to the influent. When comparing the two devices that incorporate membranes, the device with the smaller nominal pore size (0.2 µm vs. ≥1 µm) exhibited the best performance. These findings suggest that POU devices that incorporate physical treatment barriers, including membrane filtration, may be optimal for MP removal (if desired) from drinking water.
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Household Point-of-Use Devices for the Removal of Microplastics in Drinking Water: A Scoping Review Protocol
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This research review summarizes existing studies on home water filters that can remove tiny plastic particles (called microplastics) from tap water. The goal is to figure out which household water treatment devices actually work to filter out these plastic bits before you drink the water. This matters because microplastics are increasingly found in drinking water, and scientists want to help people understand which home filters might protect their health.
Effectiveness of Household Water Filtration Systems in Eliminating Plastic Particles: A Case Study from Mosul City, Iraq
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Researchers tested the effectiveness of household water filtration systems—including pitcher, faucet-mounted, and reverse osmosis filters—in removing microplastic particles from tap water, finding that reverse osmosis achieved the highest removal efficiency while pitcher filters performed variably.
Occurrence, characterization, and removal efficiency of microplastics in point-of-use drinking water systems: A case study in Dogonbadan, Iran
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Researchers sampled inlet and outlet water from point-of-use drinking water systems in Iran and found that rather than removing microplastics, these systems actually increased average concentrations from 11.66 to 20 MPs/L, with polycarbonate and polypropylene as dominant polymer types.
Are Water Filters Effective Against Microplastics?
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Comparing microplastic concentrations in water from purifiers, tap water, and ceramic filters found ceramic filters had significantly lower MP levels (0.49 MPs/L) compared to purifiers (1.41 MPs/L) and tap water (1.13 MPs/L) across 9,262 identified microplastic items.
Microplastic removal across ten drinking water treatment facilities and distribution systems
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Researchers characterized microplastic removal across ten drinking water treatment facilities and found that conventional municipal treatment achieved greater than 97.5% removal, primarily through granular media filtration or ultrafiltration. Untreated source waters contained between approximately 1,200 and 7,200 microplastic particles per liter, with polypropylene, polyethylene, and polyamide being the most common types. The findings provide valuable data on microplastic exposure through drinking water and the effectiveness of existing treatment processes.
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