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This water purification system is powered by static electricitySang-Woo Kim/Yonsei College in South Korea
A bottle can disinfect consuming water by channelling static electrical energy constructed up from simply 10 minutes of strolling – no restricted provide of water purification tablets or exterior energy sources required.
“Our water disinfection strategy holds explicit significance for populations in underdeveloped areas, remoted areas, catastrophe zones and battle areas missing enough sanitation infrastructure,” says Sang-Woo Kim at Yonsei College in South Korea.

Kim and his colleagues took a reusable 500-millilitre water bottle and put in a polymer electrode inside that includes an array of nanorods produced from the conducting polymer Polypyrrole. These nanorods focus the electrostatic prices that accumulate on the human physique throughout strolling to create electrical fields sturdy sufficient to kill or in any other case inactivate micro organism and viruses.
A small piece of aluminium foil connected to the surface of the bottle serves as a gripping level, whereas additionally gathering static electrical energy from the particular person’s hand, which then flows alongside a copper wire to achieve the electrode contained in the bottle.
Testing confirmed that this walking-powered methodology can fully disinfect river water containing each micro organism and viruses inside 10 minutes – and generally sooner if the particular person holding the bottle picks up the strolling tempo.
However the selection of footwear impacts the quantity of electrostatic cost harvested from the friction between the shoe supplies and the bottom. Footwear produced from polycarbonate, rubber and polyvinyl chloride (PVC) enabled considerably larger electrical output than sneakers produced from leather-based, says Zheng-Yang Huo at Renmin College of China, a coauthor on the research. And really humid circumstances can even cut back the effectiveness of this methodology.
Nonetheless, the self-sufficiency of this water disinfection methodology and the estimated value of lower than $2 per bottle might show particularly helpful in eventualities the place individuals lack each clear water provides and steady electrical energy.
The group is now centered on creating a extra environment friendly manufacturing course of for the nanorods. “We plan to develop commercially viable expertise for inexpensive and sustainable transportable containers for water purification,” says Huo.


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