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Flow electrodes may enable large-scale sea water desalination
Chemistry World ^ | 27 March 2013 | Jennifer Newton

Posted on 03/28/2013 12:13:11 AM PDT by neverdem

Across the world, millions of people cannot access fresh, clean water. With global populations rising and freshwater supplies regularly becoming overdrawn or contaminated, the ability to purify sea water is becoming increasingly important.

Now, scientists from South Korea have modified a water treatment method called capacitive deionisation, with the aim of desalinising sea water on a large scale. Capacitive deionisation uses an electric field to remove cations and anions from water flowing past two oppositely placed electrodes. The team, led by Moon Hee-Han from Chungnam National University and Dong Kook-Kim from the Korea Institute of Energy Research, have developed flow electrodes from a suspended carbon material. Not only is this approach more energy efficient – it does not require a discharge step like conventional capacitive deionisation – but it can also be easily scaled-up simply by increasing the number of flow electrodes in the system.

Yury Gogotsi, an expert in capacitive deionization from Drexel University thinks the flow configuration developed by Moon and co-workers addresses one of the key challenges facing the technology: the small size of electrodes electrosorbing salt ions. ‘In theory, a flow electrode can yield an infinite capacity, only limited by tank size, and be used for water desalination on a large scale, supplying drinking water to a population,’ he says, adding that, although a proof-of-concept has been demonstrated, further development of the electrode suspension could improve efficiency further. ‘Overall, optimization of this system design may be able to provide a new solution for medium- and large-scale water desalination,’ he says.

References

Sung-il Jeon et al, Energy Environ. Sci., 2013, DOI: 10.1039/c3ee24443a




TOPICS: Culture/Society; News/Current Events; Technical
KEYWORDS: desalination; seawaterdesalination

1 posted on 03/28/2013 12:13:11 AM PDT by neverdem
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To: neverdem

Much like what happened in Seattle, the EPA will come in and call salt a pollutant and ban it from being dumped in the ocean. For those who don’t remember the Seattle city government banned salt from being used as a deicer because it would pollute the Puget Sound.


2 posted on 03/28/2013 12:20:29 AM PDT by LukeL (Barack Obama: Jimmy Carter 2 Electric Boogaloo)
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To: neverdem

Genetically engineered food was bad enough, now we have electronically engineered water.


3 posted on 03/28/2013 12:27:40 AM PDT by gunsequalfreedom (Conservative is not a label of convenience. It is a guide to your actions.)
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To: neverdem

Tried this years ago. A friend owned some desal IP and manufacturing.

I suggested electronically binding molecules to a screen.

I explained a windmill type thing and he had a drum in mind with screens.

I think both ideas had merit but, I liked mine best for stripping bound material off the screen.

He went with his idea and never could keep the salt off the screen before it rotated through the sea water again. That lead to clogging.

I still think the windmill would work or loading barrel screens on a conveyor would work.


4 posted on 03/28/2013 12:37:17 AM PDT by Vendome (Don't take life so seriously, you won't live through it anyway)
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To: LukeL

Surely they must know the salt originally came from the ocean...


5 posted on 03/28/2013 12:40:02 AM PDT by Telepathic Intruder (The only thing the Left has learned from the failures of socialism is not to call it that)
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To: El Gato; Ernest_at_the_Beach; Robert A. Cook, PE; lepton; LadyDoc; jb6; tiamat; PGalt; Dianna; ...
Vitamin D may lower diabetes risk for obese kids

Microbes May Slim Us Down After Gastric Bypass

Global Surge in Type 1 Diabetes Still an Enigma

Violent Video Games Are a Risk Factor for Criminal Behavior and Aggression, New Evidence Shows

A community-driven global reconstruction of human metabolism

FReepmail me if you want on or off my health and science ping list.

6 posted on 03/28/2013 12:58:50 AM PDT by neverdem ( Xin loi min oi)
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To: LukeL; Telepathic Intruder
Much like what happened in Seattle, the EPA will come in and call salt a pollutant and ban it from being dumped in the ocean. For those who don’t remember the Seattle city government banned salt from being used as a deicer because it would pollute the Puget Sound.

What kind of salt were they talking about, sodium chloride or an almost infinite number of ionic compounds?

7 posted on 03/28/2013 1:30:12 AM PDT by neverdem ( Xin loi min oi)
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To: Vendome

What’s an IP? I’m not a mind reader. I doubt that many on this forum can read minds.


8 posted on 03/28/2013 1:34:16 AM PDT by neverdem ( Xin loi min oi)
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To: neverdem

Intellectual Property...


9 posted on 03/28/2013 2:13:44 AM PDT by Vendome (Don't take life so seriously, you won't live through it anyway)
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To: neverdem

This was on FR a while ago
http://www.freerepublic.com/focus/f-news/2998282/posts

It’s about using graphene for desalination .


10 posted on 03/28/2013 2:33:14 AM PDT by Lurkina.n.Learnin (Obama is the Chicken Little of politics)
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To: neverdem

This will be driven by price.


11 posted on 03/28/2013 2:51:58 AM PDT by 1010RD (First, Do No Harm)
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To: LukeL
Much like what happened in Seattle, the EPA will come in and call salt a pollutant and ban it from being dumped in the ocean. For those who don’t remember the Seattle city government banned salt from being used as a deicer because it would pollute the Puget Sound.
It would depend on the concentration, of course - enough salt would kill all the marine life in the Sound. But that much salt would wreak havoc on land a lot quicker.

12 posted on 03/28/2013 3:26:37 AM PDT by conservatism_IS_compassion (“Liberalism” is a conspiracy against the public by wire-service journalism.)
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To: 1010RD
This will be driven by price.
We certainly hope. Otherwise the fuel required would be better spent on transportation of potable water from elsewhere.

13 posted on 03/28/2013 3:34:18 AM PDT by conservatism_IS_compassion (“Liberalism” is a conspiracy against the public by wire-service journalism.)
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To: neverdem

From my understanding they won’t remove salt but rather the Sodium and Chlorine atoms will separate out to the cathode and anode respectively. These present a different problem from salt but there are industrial applications to which they could be applied.


14 posted on 03/28/2013 3:57:10 AM PDT by outofsalt ("If History teaches us anything it's that history rarely teaches us anything")
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To: neverdem

From the abstract: "A capacitive deionization process utilizing flow-electrodes (FCDI) was designed and evaluated for use in seawater desalination. The FCDI cell exhibited excellent removal efficiency (95%) with respect to an aqueous NaCl solution (salt concentration: 32.1 g L−1), demonstrating that the FCDI process could effectively overcome the limitations of typical CDI processes. "

15 posted on 03/28/2013 4:15:18 AM PDT by Right Wing Assault (Dick Obama is more inexperienced now than he was before he was elected.)
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To: neverdem

Plentiful gas allows the desalinization at lo cost.

If there were any brains in California, there would be new gas on line and plenty of water from the gas fired desalinization plants

Electricity can be a by product


16 posted on 03/28/2013 4:20:03 AM PDT by bert ((K.E. N.P. N.C. +12 .....The fairest Deduction to be reduced is the Standard Deduction)
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To: 1010RD

Ideally, yes. But do you really think governments will allow the marketplace to work freely?


17 posted on 03/28/2013 4:29:13 AM PDT by monocle
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To: Telepathic Intruder

they also know lead comes the ground too.


18 posted on 03/28/2013 4:32:28 AM PDT by riverrunner
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To: monocle

Nope, government always violates the investing rule - “never subsidize your losers”.


19 posted on 03/28/2013 4:40:55 AM PDT by 1010RD (First, Do No Harm)
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To: 1010RD

Which will be driven by power requirements. Where’s the juice come from? Millions of windmills?


20 posted on 03/28/2013 6:16:23 AM PDT by ProtectOurFreedom
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To: ProtectOurFreedom

Windmills, millions of acres of solar panels and a ring of wave machines surrounding the country. It will be driven by prices, with the money coming from market success or government slickness.


21 posted on 03/28/2013 12:43:51 PM PDT by 1010RD (First, Do No Harm)
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To: riverrunner

Lead comes from the ground, but not in its raw form. Salt, on the other hand, just dissolves in the water again. I suppose there may be an issue with local salinity, but I’d have to hear it to believe it.


22 posted on 03/28/2013 8:43:37 PM PDT by Telepathic Intruder (The only thing the Left has learned from the failures of socialism is not to call it that)
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