Desalination can provide a critical water supply, but today's most common methods come with significant drawbacks. Reverse osmosis forces water through specialized membranes to remove salt, while thermal distillation uses heat to separate fresh water from seawater. Both approaches can consume large amounts of energy, often require water treatment before and after the process, and generate a highly concentrated salty waste known as brine.

When that brine is discharged back into the ocean, it can increase local salinity and reduce oxygen levels, creating harmful conditions for marine organisms.

In Professor Chunlei Guo’s lab at the University of Rorchester, researchers developed a solar desalination device featuring laser-etched superwicking black metal, a technology that produces fresh water from seawater while capturing salts and minerals instead of generating harmful brine waste. Credit: University of Rochester / J. Adam Fenster

Tl;dr - Different method for the same desalination, but keeps & transforms the waste into useful stuff instead of throwing it out

[–] JohnnyEnzyme@piefed.social 12 points 3 days ago (1 children)

Huh! Okay.....
Thank you!

Unfortunately, haha, as with most such tech advances, I'm just waiting for billionaire a-holes to buy up the means of production and use it to further leverage it against the common man for capitalistic purposes. Same ol', same ol'.

(nevermind, that's just my cynical side talking 😅)

[–] DeathsEmbrace@lemmy.world 6 points 3 days ago (1 children)

Its crystallization based chemistry if you want to know what they're doing.

[–] JohnnyEnzyme@piefed.social -1 points 2 days ago (1 children)

Um... would I need to embrace death or stick to pure science in terms of understanding? (because I tend to go for the latter)

[–] DeathsEmbrace@lemmy.world 4 points 2 days ago* (last edited 2 days ago)

Pure science although they use an odd combination of light based chemistry that does material manipulation to create the coffee ring effect which kind of is novel I don’t really go into light chemistry.

[–] quediuspayu@lemmy.dbzer0.com 12 points 3 days ago* (last edited 3 days ago) (3 children)

I don't know how regular desalination plants work, this method apparently works by evaporating water on a black surface, and the cool trick is that the surface is self cleaning, so the salt can be recovered as a solid.

[–] cynar@lemmy.world 1 points 2 days ago

Most modern desalination plants use a "reverse osmosis" method.

You have a barrier that water can pass through, but salt can't. Normally, water would be drawn across this barrier, till the salinity is the same on both sides. This is osmosis, and how things like plants draw in water.

Reverse osmosis works by using a high pressure on the salty side. This effectively forces water against the osmotic gradient. This is generally done with relatively small amounts of salt water at a time. The end result is fresh water on one side, and extremely salty water on the other. If the salty "brine" is discharged too fast, it can mess up the local salinity levels in the sea around the vent. The process is also very energy intensive (though a LOT less than boiling the water off).

You also have the problem of the membrane being very sensitive to getting damaged or blocked up. You need to clean the sea water up a lot before you can desalinate it.

This new process would help avoid the brine issue, as well as likely being less sensitive to contaminants.

[–] Corkyskog@sh.itjust.works 1 points 2 days ago

Pretty sure regular plants usually heat water, collect the steam and then discharge the brine back out and repeat that.

[–] JohnnyEnzyme@piefed.social 3 points 3 days ago

Interesting. I've previously seen survivalist methods work similarly with as little as a container of salty water placed inside a modified 2L soda bottle. Sun-powered evaporation makes for a natural still! :D