According to Japanese sources Mainichi, it is indeed treated waste water one one side and desalination brine on the other. Both the waste water and brine are meant to be dumped anyway, and it’s also harmful to sea life to dump brine directly. Treated waste water isn’t saline, so is perfect for diluting the brine. Might as well get some free power out of it.
nulluser@lemmy.world 20 hours ago
That makes a lot more sense than sea water and fresh water.