Green Vision: A Solar Powered Desalin...

Green Vision: A Solar Powered Desalination Plant With CAES Backup

There are 6 comments on the Seeking Alpha story from Aug 27, 2013, titled Green Vision: A Solar Powered Desalination Plant With CAES Backup. In it, Seeking Alpha reports that:

Seawater reverse osmosis technology is the leading solution to the potable water crisis.

Join the discussion below, or Read more at Seeking Alpha.

LessHypeMoreFact

Etobicoke, Canada

#1 Aug 27, 2013
Their vision is a bit foggy. Forward osmosis can use low grade (waste) heat as the power, takes MUCH less energy than reverse osmosis and is much more effective at desalinating high salt water (i.e sea water).

http://tinyurl.com/nkpzdlg

This reference indicates HALF the cost of RO desalination. Rather than using pumps at high pressure (and cost), the water is allowed to diffuse into a solute that is higher in osmotic pressure than the source. This is then separated by low grade heat to recover the purified water and the solute for more cycles.

Since: Mar 13

Location hidden

#2 Aug 30, 2013
LessHypeMoreFact wrote:
Rather than using pumps at high pressure (and cost), the water is allowed to diffuse into a solute that is higher in osmotic pressure than the source. This is then separated by low grade heat to recover the purified water and the solute for more cycles.
Sorry, this doesn't make much sense. If the draw solution has a higher osmotic pressure, that generally means that it takes MORE energy to get the water out rather than less. Where is the savings?
LessHypeMoreFact

Etobicoke, Canada

#3 Aug 30, 2013
KitemanSA wrote:
<quoted text> Sorry, this doesn't make much sense. If the draw solution has a higher osmotic pressure, that generally means that it takes MORE energy to get the water out rather than less. Where is the savings?
It works, moron. And the savings is in the necessary energy. The concentrates solute draws the water out of the salt solution where it can be recovered from the solute with low grade heat.

Even with high grade energy being used in both, the FO is half the cost, and with use of 'waste heat' which RO cannot do, the FO can reach very high effectiveness.

Since: Mar 13

Location hidden

#4 Aug 30, 2013
LessHypeMoreFact wrote:
<quoted text>
It works, moron. And the savings is in the necessary energy. The concentrates solute draws the water out of the salt solution where it can be recovered from the solute with low grade heat.
Even with high grade energy being used in both, the FO is half the cost, and with use of 'waste heat' which RO cannot do, the FO can reach very high effectiveness.
In other words, you take his word on it but have no idea, so you call me names? Not very mature there.
Using low grade heat SOUNDS like distillation, in which case, why not just distill the original water?
LessHypeMoreFact

Etobicoke, Canada

#5 Aug 30, 2013
KitemanSA wrote:
<quoted text> In other words, you take his word on it but have no idea,
His word? Whose?? Do you have a background in the issue? If you did, you would understand the process. It is perfectly valid as both science and engineering. One indicator of a diminished capacity is that all of this is readily available on the internet yet you have yet to research a SINGLE paper.
KitemanSA wrote:
<quoted text> so you call me names? Not very mature there.
Facts are not 'calling names'. SO far, you have not shown 'ignorance' so I can only assume stupidity. Not to excuse you, of course.
KitemanSA wrote:
<quoted text>
Using low grade heat SOUNDS like distillation, in which case, why not just distill the original water?
Not distillation. One possible draw solution is CO2 plus Ammonia. To create the extracted water, you drive off these elements and condense them elsewhere. So you are not distilling the WATER so much as driving off the solute.

Since: Mar 13

Location hidden

#6 Aug 31, 2013
>>=MHLF
::=Me

>> His word? Whose?? Do you have a background in the issue?
:: Actually, yes. I've worked water purification professionally for the Navy in the past.

>> If you did, you would understand the process.
:: But I don't, at least not with the limited data presented so far.

>> It is perfectly valid as both science and engineering.
:: But it was also listed as valuable for small amounts, repeatedly, so would it actually do in lieu of the original article's proposal. Not demonstrated yet.

>> One indicator of a diminished capacity is that all of this is readily available on the internet yet you have yet to research a SINGLE paper.
:: One indicator of rudeness and name calling is the accusation of "diminished capacity". Your "symptoms" are just as indicative of a lack of real interest.

>> Facts are not 'calling names'.
:: Calling names does not fact make.

>> SO far, you have not shown 'ignorance' so I can only assume stupidity. Not to excuse you, of course.
:: Then you make an ASS out of U but not ME.

>> Not distillation. One possible draw solution is CO2 plus Ammonia. To create the extracted water, you drive off these elements and condense them elsewhere. So you are not distilling the WATER so much as driving off the solute.
:: So they are distilling the solution for the solute, not the solvent. Interesting, but still distillation.

See, it could have been SOOO much easier if you had just stated the last few sentences. The you wouldn't have appeared nearly as big an ASS.

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