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With my (admittedly limited) understanding of the topic, extracting the water from ocean water is a relatively simple process.
The problem is what do you do with the brine afterwards. The process featured in the article makes it harder for the brine to clog the system, which is admittedly an important step. But you can’t put the brine back into the ocean without risking killing local wildlife.
And I’m not under the impression that there are any practical uses for brine, at least not at that scale.
Would it be posible to salinate the waste water that goes back to the ocean from treatment plants?
I think the problem is that it's too salinated and needs to be put back into the ocean slowly over a wide area.
Well this would be mixing the treated water with the salt ... which in theory should get close-ish to the amount of water put into the system/the original balance
It actually sounds pretty reasonable at least on the surface.
Another idea might be shipping that off for cheap road ice control in states with winter weather
There's a lot more in the salt than just salt, probably introducing a bunch of issues into trying to use it for deicing roads.