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Common cleaning sponge found to release trillions of microplastic fibers

sciencedaily.com13 points6 comments
Screenshot of Common cleaning sponge found to release trillions of microplastic fibers

Melamine "magic" sponges, made from poly(melamine-formaldehyde) polymer, remove stains through an abrasive, sandpaper-like foam that wears away during use and sheds microplastic fibers into wastewater. Researchers simulated repeated scrubbing of products from three brands against rough metal and found that lower-density sponges degrade faster and release far more fibers. Measurements show a sponge emits about 6.5 million microplastic fibers per gram of material lost; using an assumed 10% wear rate and Amazon sales from August 2023 as a baseline, that translates to roughly 1.55 trillion microplastic fibers released globally each month from those sales alone.

Those fibers travel through drains and wastewater systems into rivers, lakes and oceans, enter aquatic food webs and ultimately reach humans. To limit this pollution source, manufacturers should design denser, longer-lasting sponges, consumers can switch to nonplastic cleaning materials, and filtration at the household and wastewater-treatment level should be improved to capture fibers before they escape. The research was supported by the National Natural Science Foundation of China and the Key-Area Research and Development Program of Guangdong Province.

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