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Capturing water in deserted air to give people drinking

Penelitian - The World Water Council study says more than 1.1 billion people do not have access to safe drinking water around the world and many coastal areas prone to drought in remote areas have little or no rain and expensive water transport costs but have abundant fog that occur regularly. Two research teams presented a solution to solve this problem in two separate reports.

Harvesting the fog is a promising solution for providing clean water in areas close to the ocean where clouds of mist form on water and then transported by the wind. Mist consists of small droplets with a typical 10 μm diameter. Researchers have designed a variety of artificial fog harvesting systems, including mimicking the natural haze-gathering mechanisms in animals and plants.

Penelitian Capturing water in deserted air to give people drinking

The high humidity level and material developments to drive the harvester level are greater, but the real limiting factor with the device is the aerodynamic aberration that prevents droplets. Maher Damak and Kripa Varanasi at the Massachusetts Institute of Technology in Cambridge demonstrated the resolution of aerodynamic deviation problems.

This device can take more than 60 g of water from mist per hour on energy consumption of 2 kWh/m3 or lower energy cost than current reverse-osmosis desalination procedure. The catcher can also be used to capture steam from power plant chimneys where up to 150 million gallons of water per year. Damak and Varanasi have established the company for the purpose of commercializing the device.

To collect water from the air requires a material that will condense droplets and then be released. Omar Yaghi at the University of California at Berkeley and colleagues used a porous metal-organic framework MOF-801 - [Zr6O4(OH)4(fumarate)6], though some strength is still needed in the sunburned desert. Night temperature down in the desert will also help the absorption of water that can be released during hot days.

Yaghi and colleagues tested their devices in original desert conditions in Arizona and improved on prototypes that eliminated the need for external cooling sources. This device collects about 200 ml of water per kilogram per day in a night cycle and is cheaper on an aluminum base where the water captured can double.

Journal :

Maher Damak and Kripa K. Varanasi. Electrostatically driven fog collection using space charge injection, Science Advances, 08 Jun 2018, DOI:10.1126/sciadv.aao5323

Farhad Fathieh et al. Practical water production from desert air, Science Advances, 08 Jun 2018, DOI:10.1126/sciadv.aat3198



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