MIT engineers and collaborators developed a solar-powered device that avoids salt-clogging issues of other designs.

    • linearchaos@lemmy.world
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      1 year ago

      Desalination can be as easy as evaporation. But the volume over time is abysmal.

      The faster you clean it the faster you build up the salt.

      Like everything, problems appear at scale that aren’t even a concern at the individual level.

  • Wooster@startrek.website
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    1 year ago

    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.

    • trackindakraken@lemmy.whynotdrs.org
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      1 year ago

      There are no perfect solutions.

      Of course, we’ll put the brine back into the ocean. We can run pipelines out miles to disperse the brine and dilute it. We’ll need regulation to ensure this, because no capitalist corporation will do anything that cuts into profits without regulations forcing it.

      Second only to air, fresh water is what we all need. We’ll do what we must to have it. Of this I’m certain.

    • surfrock66@lemmy.world
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      1 year ago

      I’ve always wondered why we can’t contain the brine and pack it into abandoned salt mines for long-term storage. It would probably inspire some maintenance on abandoned salt mines and prevent cave-ins.

    • Kache@lemm.ee
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      1 year ago

      Maybe have ocean voyaging ships (e.g. container ships) do controlled release of brine through their journey?

      Though probably no way of achieving this via current economic and legal systems. Even if attempted today, ships would probably be incentivized to dump the entire payload the moment they cross into internal waters.

  • Kecessa@sh.itjust.works
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    1 year ago

    Big box with pipe pointing up in the middle that exits the box through the bottom to reach a collection tank

    Fill with salt water without going past the pipe opening

    Add transparent lid with a slope towards the middle so the water condenses and drops in the pipe

    Go do whatever you want all day, you’ve got a passive drinking water creator and nothing to clog since solids just accumulate at the bottom and can be scooped out as needed.

  • Xavier@lemmy.ca
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    1 year ago

    Small question (perhaps dumb on my part as I haven’t slept yet), do these desalination system remove other chemicals such as PFAS, arsenic, lead? I think I read that they use nanofiltration membranes to remove almost everything. How about molecules that are smaller than water (H₂O)? Do they get filtered?

    • GreyEyedGhost@lemmy.ca
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      1 year ago

      Most molecules aren’t smaller than water, however filters that are small enough to only let water through clog pretty quickly. That said, most heavy metals and salts won’t evaporate in a decent still (which is good, because atoms and ions are often smaller than water). I’m not sure about PFAS and microplastics, but I expect they don’t evaporate.

  • Dizzy Devil Ducky@lemm.ee
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    1 year ago

    Cheaper than tap but at a 500% markup for CoNvEnIeNcE! You know that if it’s cheap, the large black scarf buckets (c*pitalists) will come in and force the prices to go up until nobody can afford it.