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

submitted 1 year ago by Gsus4@feddit.nl to c/technology@lemmy.world

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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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[-] Smoogs@lemmy.world -2 points 1 year ago

Solar panels also have an issue that come with it covering the earth with more black surface which is negating the point of what the ice was doing to cool the earth before it melted. Ocean water is black and solar panels are black. This is known as albedo effect.

then you have the issue of helping people. Sure, helping people who have NO ACCESS TO WATER this should definitely be an option.

But offering it to people whom already have tap water and access to water as a secondary ‘cheaper’ option is not so altruistic particularly if we don’t consider the impact as the aforementioned non reflective surface that is a much bigger impact on global warming. Hence that solar panels aren’t an all-source solution for the overall issues.

[-] NOT_RICK@lemmy.world 2 points 1 year ago

They’re not solar panels, they’re solar powered by a black sheet that heats up the box to get the water evaporating. Creating clean tap water also takes energy so unless the effect of the box’s lower albedo is greater than the environmental cost of cleaning and transporting water it’s still a net positive, especially in those parts of the world where fresh water is scarce.

[-] Smoogs@lemmy.world 1 points 1 year ago

Again, not arguing if it’s needed where water is scarce, So the topic is switching to a cheaper form for tap water and this is being sold as an idea to people who already have water.

[-] NOT_RICK@lemmy.world 1 points 1 year ago

I saw that more of them contextualizing how cheap it is but I could be wrong

this post was submitted on 28 Sep 2023

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