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08-05-2019, 10:23
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#1
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Registered User
Join Date: Aug 2010
Location: Longboat Key, FL, USA
Boat: 1988 Hunter Legend 35
Posts: 42
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Interesting development in desalination
seems that some science bods over at Columbia have discovered a cheap and easy way to desalinate water, not sure whether that will ever translate into a method for offshore water making but definitely worth watching
https://science.slashdot.org/story/1...alt-from-water
Grae Morrison
'72 Cal 2-29 Destiny
Red Bank, NJ
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08-05-2019, 11:16
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#2
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,362
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Re: Interesting development in desalination
“Membrane-less and Non-Evaporative Desalination of Hypersaline Brines by Temperature Swing Solvent Extraction” ~ by Chanhee Boo et al.
➥ https://pubs.acs.org/doi/10.1021/acs.estlett.9b00182
More ➥ https://engineering.columbia.edu/pre...l-desalination
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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08-05-2019, 13:59
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#3
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Registered User
Join Date: Mar 2011
Location: Panschwitz, Germany
Boat: Woods Mira 35 Catamaran
Posts: 4,258
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Re: Interesting development in desalination
Interesting.
Not sure I understood that right, but do we than need to stock that solvent onboard?
What do you do with solvent and brine?
Is that biodegradable and environmentally ok to dispose?
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09-05-2019, 03:58
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#4
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Registered User
Join Date: Sep 2011
Location: On a boat
Boat: 1987 Cabo Rico 38 #117 (sold) & 2008 Manta 42 #124
Posts: 4,174
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Interesting development in desalination
Quote:
Originally Posted by Franziska
Interesting.
Not sure I understood that right, but do we than need to stock that solvent onboard?
What do you do with solvent and brine?
Is that biodegradable and environmentally ok to dispose?
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Distilled water is a solvent so until we know what that solvent is (I didn’t read the extended article) we can’t assume it’s not eco friendly.
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09-05-2019, 04:16
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#5
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,362
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Re: Interesting development in desalination
Quote:
Originally Posted by zboss
Distilled water is a solvent so until we know what that solvent is (I didn’t read the extended article) we can’t assume it’s not eco friendly.
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Among the solvents, DIPA exhibited the highest water extraction efficiency whereas ECHA and DMCHA produced water with the lowest salt content and solvent residue content, respectively.
DIPA = diisopropylamine
ECHA = N-ethylcyclohexylamine
DMCHA = N,N-dimethylcyclohexylamine
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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09-05-2019, 04:33
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#6
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Registered User
Join Date: Mar 2011
Location: Panschwitz, Germany
Boat: Woods Mira 35 Catamaran
Posts: 4,258
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Re: Interesting development in desalination
Hey Gord, thanks for that.
Any thoughts on the environmentally friendliness of these?
I did not understand the article fully and have the impression that the saturated brine needs to be dumped or reprocessed in special facilities.
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09-05-2019, 09:05
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#7
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,362
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Re: Interesting development in desalination
DIISOPROPYLAMINE (DIPA) Hazard Sheet:
“... It may be necessary to contain and dispose of Diisopropylamine as a HAZARDOUS WASTE. Contact your state Department of Environmental Protection (DEP) or your regional office of the federal Environmental Protection Agency (EPA) for specific recommendations. * If employees are required to clean-up spills, they must be properly trained and equipped. OSHA 1910.120(q) may be applicable ...:
☞ https://nj.gov/health/eoh/rtkweb/documents/fs/0728.pdf
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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09-05-2019, 09:35
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#8
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Registered User
Join Date: Mar 2011
Location: Panschwitz, Germany
Boat: Woods Mira 35 Catamaran
Posts: 4,258
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Re: Interesting development in desalination
So, not really something we would like in larger quantities on board.
Guess reverse-osmosis is with us for a while. Still, a while ago there was also rumors or a Graphene based filters which can do it without the high pressure.
Heard nothing new on this though more recently.
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09-05-2019, 10:28
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#9
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Registered User
Join Date: Jan 2012
Posts: 176
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Re: Interesting development in desalination
Quote:
Originally Posted by Franziska
So, not really something we would like in larger quantities on board.
Guess reverse-osmosis is with us for a while. Still, a while ago there was also rumors or a Graphene based filters which can do it without the high pressure.
Heard nothing new on this though more recently.
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A big corp (can't remember which - 3M, whatever) bought up the patent rights for graphene filter tech. Good luck seeing an affordable unit any time soon.
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09-05-2019, 10:29
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#10
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Registered User
Join Date: Jul 2016
Location: West Palm Beach, FL
Boat: Catalina 470
Posts: 1,131
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Re: Interesting development in desalination
Interesting that the article specifically mentions "Hypersaline brines—water that contains high concentrations of dissolved salts and whose saline levels are higher than ocean water". The article further talks about this desalination as a way to clean up toxic "water produced during oil and gas production, inland desalination concentrate, landfill leachate (a major problem for municipal solid waste landfills), flue gas desulfurization in fossil-fuel power plants, and effluent from industrial processes". Not sure that this is a viable alternative for the typical cruising sailor, but it is still interesting nevertheless.
-David.
__________________
“Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.” – Mark Twain
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09-05-2019, 11:57
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#11
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Registered User
Join Date: Aug 2009
Location: Maryland
Boat: Outbound 46
Posts: 323
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Re: Interesting development in desalination
This is aimed at brines that have on the order of 5-10x the salinity of sea water. It makes little sense for cruisers, but could be very useful in dealing with brines that are a byproduct of oil production, for example. Even trace amounts of these solvents remaining in the water would make them unfit for human consumption. This kind of technology could make sense if you need to desalinate tens of thousands of gallons of highly concentrated brines.
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09-05-2019, 14:37
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#12
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Registered User
Join Date: Dec 2017
Location: Otaki, New Zealand
Boat: Dix 43 HD
Posts: 107
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Re: Interesting development in desalination
Lots of work still being done with graphene - it should prove to be the filter of the future but may also be the material boats are built out of - or painted with to reduce fouling
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