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Plasma based water purification system

08.11.2018

Researchers at the University of Alabama at Huntsville have developed a new device that uses plasma jets and hydroxyl radicals to purify water of hard-to-remove bacteria and toxins.

Many of today's water treatment methods require the use of filters and chemicals that need regular replenishment or maintenance. At the same time, millions of people live in areas with limited access to such materials, so researchers are looking for new options for water purification using plasma. Typically, plasma water treatment is expensive, but a new class of plasma devices could change that.

Researchers at the University of Alabama at Huntsville have been studying a new type of plasma generator for water purification. The new generator supplies voltage to ionize the gas at atmospheric pressure and creates many beneficial by-products, including hydroxyl radicals, which set off a cascade of water-purifying reactions.

While the term "plasma" conjures up images of very hot solar streams moving through space, plasma-based water purification methods exploit its property to generate reactive free radicals, rendering many compounds in water inert. The plasma and subsequent chemical reactions release energy and chemicals that can kill even the microcystin that causes algae blooms lurking in our water supply.

Unlike the more common ozone-based plasma cleaners, the new device is based on the production of hydroxyl radicals. This method, scientists suggest, will bypass some of the obstacles that ozone analogues cannot, namely high energy consumption and excessive heat generation.

Using optical emission spectroscopy, the researchers compared how different factors play a role in producing more hydroxyl radicals in their plasma device. For example, increasing the voltage seems to have the greatest impact on the final result by increasing the frequency of the pulses.

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Eleven video cameras with ultra wide-angle lenses and 14 microphones are scattered throughout the house and continuously record from the moment the boy wakes up to the time he goes to bed. Each room has a button on the wall that allows you to interrupt the recording and even erase the last few minutes in case any too intimate scenes get into the lens.

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