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Researchers develop desal on a chip
Scientists have made a nanotech device to strip salt from seawater, paving the way to small-scale, battery-powered desalination for drought-hit regions and disaster zones.

The tiny prototype, which appears in Nature Nanotechnology, comes on the eve of the UN's World Water Day, which aims to highlight the worsening problems of access to clean water.

Conventional desalination works by forcing water through a membrane to remove molecules of salt.

But this process is an energy-gobbler and the membrane is prone to clogging, which means desalination plants are inevitably big and expensive.

The new device has been given a proof-of-principle test by Associate Professor Jongyoon Han and colleagues of the Department of Electrical Engineering and Computer Science at Massachusetts Institute of Technology (MIT).
Pushed aside

It works through so-called ion concentration polarisation, which occurs when a current of charged ions is passed through an ion-selective membrane.

The idea is to create a force that moves charged ions and particles in the water away from the membrane.

When the water passes through the system, salt ions - as well as cells, viruses and micro-organisms - get pushed to the side. This saltier water is then drawn off, leaving only de-salinated water to pass through the main microchannel.

The tiny device had a recovery rate of 50%, meaning that half of the water used at the start was desalinated; 99% of the salt in this water was removed.

Energy efficiency was similar to or better than state-of-the-art large-scale desalination plants.

"Rather than competing with larger desalination plants, the methods could be used to make small- or medium-scale systems, with the possibility of battery-powered operation," the researchers write.
Working in parallel

Han says the experiment used a tiny microfluidic chip, just a few millimetres square, which desalinated 10 microlitres per minute.

"The idea toward the real-world application is that we would make many of these devices, thousands or tens of thousands of them, on a plate, and operate them in parallel, in the same way semiconductor manufacturers are building many small electronic chips on a single large wafer," says Han.

"That would bring the flow rate up to around 100 millilitres per minute level, which is comparable to typical household water purifiers and therefore useful in many applications."

A patent has been filed for the device. However, it may be a matter of years before the invention reaches a commercial scale.

At such early days, the costs of the future system are unknown.

But, Han says overheads may be significantly reduced because gravity can be used to put the water through the device, as opposed to forcing it through by pumps, and there is less of a problem of membrane fouling.

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