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Thread: Scientists Figure Out New Way to Remove Salt From Water

  1. #1

    Scientists Figure Out New Way to Remove Salt From Water

    The solvent-based method could be much cheaper to use than reverse osmosis or distillation based on water evaporating.
    Brine water produced by the oil and gas industry contains even more dissolved salts than ocean water, and is a growing environmental concern - but scientists have figured out a new way to treat it.
    These hypersaline brines can pollute the fresh water resources which communities depend on, and are difficult to treat.
    But a team of engineers from Columbia University in the US say they have now developed a radical new approach to desalinating them.


    The method, known as "temperature swing solvent extraction" (TSSE), involves mixing the hypersaline brine with an amine solvent.
    Scientists say the method can desalinate very high-salinity brines, up to seven times the concentration of seawater. This is more than both the method currently used for seawater desalination, known as reverse osmosis, and the water evaporation method can achieve.
    The method was published in the scientific journal Environmental Science & Technology Letters.
    Once it is mixed in the brine, the solvent, which is less dense, is lifted to the top of the brine.
    The mix is then placed on a room temperature bath to help complete the water extraction - and after that the solvent is decanted from the mixture.
    A warm water bath then provides a temperature swing which de-mixes the processed water from the solvent - because the solvent is less able to hold water at higher temperatures.
    When the solvent releases the water, it sinks to the bottom of the bottle - from where it can be collected.
    Assistant professor Ngai Yin Yip, who published the paper, said: "I thought solvent extraction could be a good alternative desalination approach that is radically different from conventional methods because it is membrane-less and not based on evaporative phase-change.

    Crucially, the solvent method is powered by low-grade heat, under 70C (158F), meaning it is far less energy-intensive to use, and can remove up to 98.4% of the salt in these brines and recover high amounts of water.

    More at: https://www.oilandgaspeople.com/news...-gas-industry/
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  3. #2
    Brine water produced by the oil and gas industry contains even more dissolved salts than ocean water, and is a growing environmental concern
    Salt water a "growing environmental concern"?

    Just dump it in the ocean??

    "Oh no! The ocean is salty now!!"
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  4. #3
    Quote Originally Posted by TheTexan View Post
    Salt water a "growing environmental concern"?

    Just dump it in the ocean??

    "Oh no! The ocean is salty now!!"
    Supposedly the ultra-concentrated brine kills sea life and creates a dead zone in the area that the desalinization plant dumps it in.

    It's also a waste of salt but I don't know how usable the salt is with this new process.
    Never attempt to teach a pig to sing; it wastes your time and annoys the pig.

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    Those who fail to learn from the past are condemned to repeat it.
    Those who learn from the past are condemned to watch everybody else repeat it

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  5. #4
    But salt has electrolytes! It has what plants crave!
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  7. #6
    Quote Originally Posted by TheTexan View Post
    Salt water a "growing environmental concern"?

    Just dump it in the ocean??

    "Oh no! The ocean is salty now!!"
    They don't pipe or truck it to the ocean but instead pump it into the ground where it can contaminate ground water. They do that in part to increase pressure underground and help drive more oil to the surface for them to extract. Farms for example do not like saline soil.
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  9. #8
    Quote Originally Posted by DamianTV View Post
    But salt has electrolytes! It has what plants crave!
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