Desalination

Researchers at MIT have discovered that “light in the visible spectrum is enough to knock water molecules loose at the surface where it meets air and send them floating away,” reports Michael Franco for New Atlas. “While the distinction between light-caused evaporation and heat-caused evaporation might not seem like a big one, the researchers say it could not only have a big impact on the way future evaporative projects are executed, but that it could also explain a long-standing discrepancy involving clouds,” writes Franco.

Interesting Engineering reporter Rizwan Choudhury spotlights a new study by MIT researchers that finds light can cause evaporation of water from a surface without the need for heat. The photomolecular effect “presents exciting practical possibilities,” writes Choudhury. “Solar desalination systems and industrial drying processes are prime candidates for harnessing this effect. Since drying consumes significant industrial energy, optimizing this process using light holds immense promise.”

A number of MIT spinouts and research projects – including the MOXIE instrument that successfully generated oxygen on Mars, a new solar-powered desalination system and MIT spinout SurgiBox – were featured on TIME’s Best Inventions of 2023 list.

Insider reporter Katie Hawkinson explores how MIT researchers developed a new solar-powered desalination system that can remove the salt from seawater for less than the cost of U.S. tap water. Creating a device that relies on solar power, “eliminates a major financial barrier, especially for low-income countries experiencing water scarcity,” Hawkinson explains.

MIT researchers have developed a new desalination system that uses solar energy to convert seawater into drinkable water, reports Tony Ho Tran for the Daily Beast. The device could make it possible to, “make freshwater that’s even more affordable than the water coming from Americans’ kitchen faucets.”

The Hill reporter Sharon Udasin writes that MIT researchers have developed a new solar-powered desalination device that “could last several years and generate water at a rate and price that is less expensive than tap water.” The researchers estimated that “if their model was scaled up to the size of a small suitcase, it could produce about 4 to 6 liters of drinking water per hour,” writes Udasin.

MIT researchers have developed a new underwater system that could enable long-range and low-power underwater communication, reports Edd Gent for IEEE Spectrum. “The reason why this is really exciting is because now you start opening up many of the coastal monitoring applications,” says Prof. Fadel Adib. “It’s a turning point from this being a technology that is intellectually super interesting that we hope will work, to saying we know that this works and we have a path to deployment.”

Financial Times reporter Simon Mundy and Kaori Yoshida spotlight Gradiant, an MIT startup that has developed new methods of handling industrial wastewater. “Gradiant promises customers that its technology will allow them to purify and reuse larger amounts of water, reducing the amount they need to source externally,” write Mundy and Yoshia.

Boston Globe reporter Aaron Pressman highlights Gradiant, an MIT startup that has developed a water purification system based on natural evaporation and rainfall cycles to clean wastewater at factories and manufacturing facilities.

Gradiant, an MIT startup, is using water technology to “help companies reduce water usage and clean up wastewater for reuse,” reports Simon Jessop for Reuters.

Gradiant, an MIT startup founded by Anurag Bajpayee PhD ’12, S.M. ‘08 and Prakash Govindan PhD ’12, has developed an energy efficient system that purifies water by mimicking natural rainfall cycles, reports Aaron Pressman for The Boston Globe. “Nature has the advantage of having all the surface area of the oceans available freely and a free source of energy from the sun,” Govindan said. “We have to engineer this into a compact, highly efficient, and energy-efficient industrial device.”

Infinite Cooling, an MIT startup, is developing a new system that can capture water from cooling tower plumes and could significantly reduce water consumption in evaporative cooling tower systems, reports Sonal Patel for Power Magazine. “The technology that is developed could lead to significant water savings and improve water quality with minimal energy cost,” explained members of Prof. Kripa Varanasi’s lab.

In this video, VOA reporter Steve Baragona looks at different methods of harvesting water from fog. Baragona highlights a new system developed by MIT researchers, explaining that in some areas where the water supply is dwindling, “the technology is far cheaper than other options like desalination.”

MIT graduates Maher Damak and Karim Khalil discuss their startup Infinite Cooling and the new technique they developed to capture and recycle water expelled from power plant cooling towers on Bloomberg Baystate Business. Co-host Tom Moroney calls this energy efficient method that captures up to 80 percent of the water, an “idea that could change the world.”

Xinhua reports that MIT engineers have developed a new method of harvesting water from industrial cooling towers that could decrease the operating cost of power plants. Eventually the new method could also be used to harvest, “safe drinking water for coastal cities where seawater is used to cool local power plants.”