Researchers at Washington University in St. Louis are developing a water filter that could help people in countries where there is not enough clean drinking water.
That’s put pressure on scientists to develop water-purifying technologies to help increase global access to drinking water.
They combined the fibers with graphene oxide, an extremely thin material that can convert sunlight into heat, which then kills the bacteria on the surface of the filter’s membrane.
Because the technology just requires sunlight to work, that could help rural communities without reliable access to electricity, said Young-Shin Jun, an environmental engineering professor at Wash U.
“Where we don’t have electricity, we’ll still be able to utilize this membrane to kill bacteria that we worry about,” Jun said.
The filter Singamaneni and Jun developed still has years to go before hitting the market, so it’s too early to estimate its cost.
The cost of water filtering membranes remains the biggest challenge to delivering them to water-stressed communities, said Eric Hoek, a civil engineering professor at University of California-Los Angeles.
“In order to assure that the whole world has clean, safe drinking water, we do not need a better membrane,” Hoek said.
“The most impactful contribution would be to make a membrane that performs the function of a commercially available membrane but cost 10 times less.” It’s possible that the Wash U researchers’ bacteria-based filter could be less costly compared to others on the market.
Because it uses sunlight to kill microbes that accumulate on the membrane, it “can reduce the membrane maintenance cost,” Jun said.