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New technique removes salt from water with least energy consumption

A new method that spends less energy to desalinate water will also help regenerate freshwater sources, say researchers.

By: IANS | New York | Published: January 3, 2018 7:49:51 pm
Salty water, low energy desalination, Pennsylvania State University, freshwater sources, battery electrode deionization, brackish water, water treatment plants, groundwater extraction The new method creates a more efficient method to treat salty water, but also reduces dependence on drying fresh water sources. (Image Source: Pennsylvania State University)

Providing safer drinking water to those in need may become a little easier as researchers have developed a new desalination technique that removes salt from water using less energy than previous methods.

“Globally, there is reduced access to fresh water,” said one of the researchers Bruce Logan, Professor at Pennsylvania State University in the US. “More and more, the waters that are being used are impaired, either due to salt or other contaminants, so we are seeing an increasing need to rely on less optimal water sources,” Logan said. With an aim to combat this problem, Logan and his colleagues came up with a desalination method called battery electrode deionization (BDI).

Although the current configuration is not suited to desalinate extremely salty water such as seawater, the results, published in the journal Environmental Science & Technology Letters, showed that the BDI technique could be effective as a low energy method for brackish, or slightly salty, water, such as groundwater, or for desalinating water before it enters treatment plants.

“There is nothing that inherently prevents its use with seawater, it’s just that as water gets saltier and saltier, there are other issues that we have to contend with, such as increased energy consumption and membrane fouling, that may reduce its utility relative to other approaches,” Logan said. The new method improves upon standard capacitive deionisation techniques by eliminating the regeneration stage and lowering the voltage required to complete the process, the study said.

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