Kitchen sponges have long been recognized as a potential source of household infections. However, their risks extend beyond just germs. They also contribute to microplastic pollution, a finding revealed by a research team from the University of Bonn. This group assessed the environmental impact of various sponge types, publishing their study in the journal Environmental Advances (EA).
Globally, millions rely on kitchen sponges daily, yet their role in microplastic contamination has been inadequately explored. German scientists aimed to address this gap by conducting a meta-analysis of prior laboratory experiments and data gathered by volunteers in Germany and North America.
Participants used one of three sponge types under typical household conditions, documenting their usage patterns. Researchers weighed the sponges before and after use to quantify material loss. Additionally, experts subjected sponges to laboratory tests using an automated system called SpongeBot, which simulated the mechanical stresses of dishwashing.
The results indicated that all tested sponges degraded over time, releasing microplastics. The estimated annual release per person ranged from 0.68 to 4.21 grams. Sponges with a lower initial plastic content exhibited a proportionally smaller release of particles.
Beyond microplastic shedding, the researchers identified high water consumption during manual dishwashing as a significant environmental concern. They suggest prioritizing water conservation as a first step, followed by selecting sponges with lower plastic concentrations. Finally, maintaining the cleanliness of these kitchen hygiene tools is also important.
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