One-click desalination of sea water, maybe Bei Ye also wants this portable device

People who have watched Beiye's wilderness survival program must have more or less impressions of survival skills on the island. Faced with the seawater that cannot be directly drunk in the vast sea, how to obtain essential water? The easiest way is to use distillation.

Dig a pit on the beach, pour the seawater into the pit (Bei Ye also said that if there is no water source around you can use urine), put a container in the middle of the pit to collect filtered fresh water, and lay a layer of film on top of the pit ( Such as garbage bags) or leaves and seal the edges, placing a heavy object in the middle of the seal to facilitate collection.

▲ Picture from: Tencent Video

Using the sun to evaporate the liquid in the pit, the water vapor will turn into water droplets when it meets the covering of the pit mouth, and after sufficient sunlight and time, drinkable fresh water can be obtained.

▲ Picture from: Tencent Video

Of course, this method of obtaining fresh water under very limited conditions is basically impossible for most people to use, but there are too few fresh water resources available to human beings. About 2.53% is fresh water. Therefore, desalination is not far off for ships sailing at sea or for places like remote islands.

▲ Picture from: Unsplash

In order to take advantage of the huge and "unavailable" seawater, a research team at MIT (Massachusetts Institute of Technology) has developed a "portable desalination system for producing drinking water in remote areas".

▲ Picture from: FAST COMPANY

In fact, it is not that there is no desalination equipment, but most of them are expensive, require filters and a lot of electrical support to operate, and pay attention to regular maintenance and repairs.

▲ Picture from: New Security Beat

In contrast, MIT's portable desalination unit is the size of a suitcase and weighs less than 10 kilograms. To run it requires less power than a phone charger, and a small solar panel attached to the outside of the device is enough to power it.

▲ Picture from: MIT News

Its structure is actually very simple. The water that needs to be filtered enters the machine through a tube; the water is filtered inside the device, and then clean water can flow out of another tube.

▲ Picture from: MIT News

Unlike devices that rely on filters, this portable desalination unit combines Ion Concentration Polarization (ICP) technology with an electrodialysis module that uses an electric field to remove particles such as salt molecules, as well as positive or negative charges such as bacteria and viruses. Negatively charged particles.

The whole device does not use a filter at all, which naturally saves the long-term maintenance of the filter.

▲ Picture from: MIT News

The portable desalination unit, which is still in further development, can process about 1 liter of liquid per hour and will cost about $4,000 to $6,000. When the product is fully developed, it will filter 10 times as much as it is today and is expected to be available for around $1,500.

▲ Concept map of complete product development, picture from: FAST COMPANY

The ability to turn undrinkable seawater into drinkable fresh water at the touch of a button could be useful in remote and severely resource-constrained areas, as well as to help refugees fleeing natural disasters or soldiers on long-term military operations stay hydrated, perhaps , Pei Ye will also want such a portable desalination device.

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