Jun '25 (edited) • Your Daily Dose
Challenges of Desalination
Access to fresh water is one of the biggest problems people face around the world, and I believe that many mad scientists (myself included) like to explore outside-the-box approaches to separating water molecules from brine. One of the obligations we have here in the FoMS is to provide critical information that highlights the real-world challenges involved in solving important problems, so that the newer members of our community can wrap their minds around the full scope of the challenges that need to be solved to create working solutions.
I really wish the guy presented hard numbers such as the latent heat of vaporization of water (2260 kJ/kg), energy required by reverse osmosis to desalinate 1 cubic meter of sea water (these days, roughly 3 kWh) and did a few calculations to help illuminate the scope of the challenge. To me, a good visual here is provided by asking how much water one could boil away with the potential energy held in a system consisting of a 1 metric ton block (1000 kg) that's lifted 1 meter above the ground (assume g = 10 m/s^2). You'd have 10,000 J (10 kJ) of energy available which, if you used it with perfect efficiency, would allow you to boil off just 4.4 grams of water. (Or, you could boil away 44 grams of water if you lifted the block 10 meters, or about 30 feet.) I think that really puts the central problem into perspective.
Despite this, I think this video does a fairly good job at sketching the landscape of providing fresh water on a large scale via desalination. (I think it's a lot easier to do on a small scale for homesteaders and people in the developing world, but that's a discussion for a different time.)
Enjoy!
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Challenges of Desalination
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