【能救命的技术:利用沙漠空气生产饮用水】

【能救命的技术:利用沙漠空气生产饮用水】麻省理工学院(MIT)的科学家们发明了一种可以在沙漠中生产水的技术,研究人员从亚利桑那州坦佩沙漠干燥稀薄的空气中成功提取出水。该技术适用于任何具有严酷沙漠气候的地区,并能拯救生命。关于该技术的相关报告发表在《自然通讯》(Nature Communications)杂志上。

http://www.dailymail.co.uk/sciencetech/article-5533449/New-device-produce-drinkable-water-DESERT-air.html

Scientists develop potentially life-saving device that can produce drinkable water from DESERT air 'even in the world's driest regions'

  • MIT scientists developed technology that can produce water in deserts
  • A report on the technology was published in the journal Nature Communications
  • The technology extracts the water from dry desert air in Tempe, Arizona
  • And, the researchers say it will work in any desert, as all hold some moisture

Researchers have discovered a way to produce water in the desert from thin air.

Scientists at the Massachusetts Institute of Technology (MIT) have developed technology that could save lives in harsh desert climates.

The technology allows users to transform moisture in the air into water.

A new report by the researchers, published in Nature Communications, explains how this can be useful around the world since the air in every desert holds at least some moisture.

Researchers from MIT have created a device that can turn dry desert air into water, which could potentially provide hydration in harsh climates all over the world. The product is powered solely by the sun

Researchers from MIT have created a device that can turn dry desert air into water, which could potentially provide hydration in harsh climates all over the world. The product is powered solely by the sun

The new research could help people survive the most arid climates on earth, the MIT team said.

The technology was first proposed in a paper published in Science last year, and it drew both optimistic attention and skepticism from the scientific community.

Professor Evelyn Wang, who worked on the original paper as well as the recently published study, said: 'It got a lot of hype and some criticism.

'All of the questions that were raised from last time were explicitly demonstrated in this paper. We've validated those points.'

 

The new product was tested in Tempe, Arizona, and the testing confirmed that it has the potential to help people stay hydrated in deserts.

The analysis said: 'The system, based on relatively new high-surface-area materials called metal-organic frameworks (MOFs), can extract potable water from even the driest of desert air with relative humidities as low as 10 percent.

'Current methods for extracting water from air require much higher levels - 100 percent humidity for fog-harvesting methods and above 50 percent for dew-harvesting refrigeration-based systems, which also require large amounts of energy for cooling.

'So the new system could potentially fill an unmet need for water even in the world's driest regions.'

HOW MUCH WATER CAN BE PRODUCED FROM DESERT AIR?

MIT researchers have developed a way to produce heat in the dessert.

Their technology could be used to provide hydration in dangerously dry areas around the world.

The device is powered by sunlight only, and the researchers said it could eventually be used to provide more than one-fourth of a liter of water per kilogram of metal-organic framework each day.

Pictured is the new device - developed by MIT - that can turn dry air into water in the desert. The technology was first proposed in a research paper last year, and it was met with both optimism and criticism

Pictured is the new device - developed by MIT - that can turn dry air into water in the desert. The technology was first proposed in a research paper last year, and it was met with both optimism and criticism

This output could be much higher if a more efficient material were to be used, the report stated.

The technology operates on a night-and-day cycle using sunlight.

But, researcher Dr Hyunho Kim said, 'continuous operation is also possible by utilizing abundant low-grade heat sources such as biomass and waste heat'.

Professor Wang said the device's placement during testing - on the rooftop of an Arizona State University building - allowed researchers to observe the technology 'in a place that's representative of arid areas, and [it] showed that we can actually harvest the water even in subzero dewpoints'.

Additionally, the system is more low maintenance than competing methods.

Researcher Sameer Rao said: 'This has no moving parts. It can be operated in a completely passive manner in places with low humidity but large amounts of sunlight.

'Now we have demonstrated that this is indeed possible.'

Professor Wang noted that the next step is to boost the technology's efficiency.

'We hope to have a system that's able to produce liters of water. We want to see water pouring out,' she said.

'These small, initial test systems were only designed to produce a few milliliters to prove the concept worked in real-world conditions, [but] the idea would be to produce units sufficient to supply water for individual households,' the study said.

No impurities were detected in the water created during the testing.

 


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