How To Harvest Uranium from the Ocean

By Sophie Bushwick | September 18, 2012 9:20 am

ocean

Nuclear power depends on a steady supply of uranium. The good news is that we have at least a hundred years worth of uranium. The bad news is that both demand for uranium and the price of production are rising—and a hundred years isn’t all that long. To reinforce our stock of uranium, researchers have proposed a backup plan: gather it from the sea.

For every billion pounds of water in the ocean, there are 3.3 pounds of uranium—we just need to figure out how to extract it. Over at IEEE Spectrum, Dave Levitan describes an effective technique for harvesting the diluted uranium:

The best method works like this: A polymer substrate—basically, plastic—is irradiated, and then chemicals with an affinity for uranium are grafted onto it. The material is woven into 60-meter-long braids, and these are then brought out by boat to water at least 100 meters deep. The braids are chained to the ocean floor and allowed to float passively in the water, like an artificial kelp forest. After about 60 days, the boat returns and pulls in the adsorbent materials—now sporting a healthy yellow tint from the uranium. The plastic is then brought back to shore, and the uranium is eluted [a chemical extraction method] off.

“You get between 2 and 4 grams of uranium sticking to this stuff per kilogram of plastic,” says Erich Schneider, a nuclear engineer at the University of Texas at Austin. “That doesn’t sound like a lot, but it all adds up.”

Although it’s certainly reassuring to know that we can easily supplement our other sources of uranium with plastic and seawater, this method is not without its flaws. The proposed system, described at the Philadelphia conference of the American Chemical Society, would be much more expensive and less energy efficient than traditional uranium mining. And to gather six tons of uranium per year would require a whopping million tons of plastic—which may soon be in limited supply as well.

To read more about the pros and cons of oceanic uranium, check out the full article at IEEE Spectrum.

Image courtesy of Stephen Edgar – Netweb / Flickr

CATEGORIZED UNDER: Environment, Technology
  • Paul

    The neat thing about this is it almost totally removes the incentive to build breeder reactors, at least for the next few thousand years, even if the entire world’s energy supply were to come from nuclear reactors.

  • Rabidmob

    @Paul

    I’m not sure why that’s particularly a good thing. My understanding is that breeder reactors more thoroughly expend their fuel leaving less nuclear waste.

    However personally I’m a proponent orbital solar installations.

  • Paul

    Rabidmob: the utility of breeder reactors for destroying nuclear waste is overstated. They would address only actinides, not fission products, and would require a very large number of these more expensive reactors to handle the waste stream. If we do not face a fuel shortage, it’s much easier and cheaper to just not go to all the expense of reprocessing (with its inevitable contamination and voluminous waste stream) and let spent fuel cool in sealed dry casks for centuries, or even millenia.

    Personally, I expect by that time waste actinidies will be more easily disposed of in space, instead of dangerously down here on Earth by transmutation. Fortunately, waiting a long time doesn’t foreclose any options.

  • timbebinder

    Ummmmmmmmmmmm… haven’t we been here before with gold?

  • Tony Mach

    Two things: Thorium and LFTR.

    Enough said.

  • Paul

    Tony: I’m sure utilities will love operating reactors in which radioactive high temperature molten salts circulate in the pipes. Oh, and I’m sure they’ll also love operating online reprocessing equipment.

    Or maybe they’ll just say “how nice; how about someone else work out all the kinks in that, mkay?”

  • http://n/a Rosemary Turpin

    I`ve been hearing about thorium too. I know it`s not perfect, but it`s better than uranium. I`m sorry, but I`m not qualified to say more than that. More research is needed on thorium, that`s for sure.

  • Brian Too

    At least it’s simple (or seems to be)!

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