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Desalination system could produce freshwater that is cheaper than tap water (news.mit.edu)

submitted 11 months ago by [email protected] to c/[email protected]

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Engineers at MIT and in China are aiming to turn seawater into drinking water with a completely passive device that is inspired by the ocean, and powered by the sun.

In a paper appearing today in the journal Joule, the team outlines the design for a new solar desalination system that takes in saltwater and heats it with natural sunlight.

The researchers estimate that if the system is scaled up to the size of a small suitcase, it could produce about 4 to 6 liters of drinking water per hour and last several years before requiring replacement parts. At this scale and performance, the system could produce drinking water at a rate and price that is cheaper than tap water.

https://www.cell.com/joule/fulltext/S2542-4351(23)00360-4

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[–] [email protected] -1 points 11 months ago (1 children)

You put it back in the ocean. Laughable to think you would alter the ocean's salt content this way. All of the freshwater produced would eventually end up back in the ocean anyway.

[–] [email protected] 15 points 11 months ago (2 children)

On the large scale this is true, but the problem is that the concentrated brine doesn't instantly dilute back into the entire ocean. In large quantities, the waste outflow would damage the local coastal ecosystem before it was sufficiently diluted.

[–] [email protected] 2 points 11 months ago (1 children)

What is "sufficiently diluted" this device discharges brine at only slightly higher levels than what it takes in.

[–] [email protected] 1 points 11 months ago

They're getting really good at working with tidal flow and weather to ensure they don't cause problems, it's just all got to be built into the system when they design it