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The Great Solar Dome Desalinization Project

04/29/2021 5:45 AM

Turning sea water into fresh water has become a major industry around the world...Desalinization plants are everywhere helping to supply the ever growing need for water...but there's a fly in the ointment, it requires a great deal of energy to perform this task, and the energy supplied is mostly fossil fuels....Here then is a new approach using solar energy that hopes to become a carbon neutral solution to supply much needed water in some of the Earth's driest and poorest places....and perhaps someday the whole world....

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#1

Re: The Great Solar Dome Desalinization Project

04/29/2021 6:11 AM

<...it requires a great deal of energy...>

Reverse Osmosis can be carried out on seawater for less than 4kWh/m3 desalinated water delivered these days.

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#5
In reply to #1

Re: The Great Solar Dome Desalinization Project

04/29/2021 12:04 PM

So these facilities typically produce 100k m3 of fresh water per day....What yearly energy cost do you calculate?

https://insights.globalspec.com/article/16469/multitasking-membranes-improve-water-treatment

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#6
In reply to #5

Re: The Great Solar Dome Desalinization Project

04/30/2021 3:26 AM

It's the answer to the rising sea level problem....

..."A one mm global average increase in sea-level requires 1/1000-th of a cubic meter of water for each square meter of ocean surface: 10-3 m3 × (3.618 × 1014) = 3.618 × 1011 m3 of water."...

..."The rate of sea level rise has also increased over time. Between 1900 and 1990 studies show that sea level rose between 1.2 millimeters and 1.7 millimeters per year on average. By 2000, that rate had increased to about 3.2 millimeters per year and the rate in 2016 is estimated at 3.4 millimeters per year .Apr 30, 2018"...

https://www.sealevel.info/conversion_factors.html

https://ocean.si.edu/through-time/ancient-seas/sea-level-rise#:~:text=The%20rate%20of%20sea%20level,at%203.4%20millimeters%20per%20year%20.

Total cubic meters of desalination per year...

https://en.wikipedia.org/wiki/Desalination_by_country

..." By the end of 2017 (considering plants built since 1965), the cumulative desalination capacity worldwide was 99.8 million m3/day, "...

= 36,427,000,000 cubic meters per year current vs 361,000,000,000 per mm available est is at 4 mm per year increase from ice melt....so we can go to around a trillion m3 of desalination yearly....or 2.74 billion m3 a day....

So we can increase our desalination efforts substantially...

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#7
In reply to #6

Re: The Great Solar Dome Desalinization Project

04/30/2021 4:04 AM

Desert areas in the US....

Here are the 10 states with the most sun:

  • Arizona (5,755)
  • New Mexico (5,642)
  • Nevada (5,296)
  • Texas (5,137)
  • California (5,050)
  • Colorado (4,960)
  • Oklahoma (4,912)
  • Kansas (4,890)

..."More than 30 percent of North America is comprised of arid or semi-arid lands, with about 40 percent of the continental United States at risk for desertification [source: U.N.].Jul 14, 2008"...

https://en.wikipedia.org/wiki/List_of_North_American_deserts

https://worldpopulationreview.com/state-rankings/sunniest-states

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#8
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Re: The Great Solar Dome Desalinization Project

04/30/2021 4:33 AM

The United States has nearly 500,000 square miles of desert...

https://www.worldatlas.com/articles/the-major-deserts-of-the-united-states.html

Do you remember the 444,000 square miles of hemp needed to neutralize CO2

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#13
In reply to #8

Re: The Great Solar Dome Desalinization Project

04/30/2021 6:09 AM

One inch of rain over the entire US, an area of 3.5 million square miles, would equal around 233 billion cubic meters of water, condensed into 450,000 square miles, that would equal nearly 8 inches....to get to 30 inches a year, like say Michigan, you would need about 874 billion m3 , but over the course of a year that's just 2.4 billion m3 a day...Considering that you are already getting 5 - 10 inches a year in most locations, that cuts it by perhaps a third...now we're at 1.6 billion m3 a day...but starting with perhaps a thousand square miles, that would require just say 3.5 million m3 a day...but that would produce 640,000 acres of hemp....a multi-billion dollar crop yield...

https://www.businesswire.com/news/home/20180125006048/en/Saudi-Water-Desalination-Capacity-Sets-Global-Record-at-5-Million-Cubic-Meters-a-Day

https://www.usgs.gov/special-topic/water-science-school/science/rain-and-precipitation?qt-science_center_objects=0#qt-science_center_objects

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#22
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Re: The Great Solar Dome Desalinization Project

04/30/2021 5:30 PM

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#24
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Re: The Great Solar Dome Desalinization Project

05/01/2021 2:37 PM

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#25
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Re: The Great Solar Dome Desalinization Project

05/01/2021 2:56 PM
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#12
In reply to #7

Re: The Great Solar Dome Desalinization Project

04/30/2021 5:48 AM

Not a pretty picture, then?

Not sure whether that country has any form of national tourism promoting organisation...

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#34
In reply to #7

Re: The Great Solar Dome Desalinization Project

05/05/2021 6:00 AM

That would make it a great place to harvest sunshine and put it to good use.

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#50
In reply to #7

Re: The Great Solar Dome Desalinization Project

05/07/2021 10:56 AM

You only showed 8. The other 2 are Utah and Florida.

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#9
In reply to #6

Re: The Great Solar Dome Desalinization Project

04/30/2021 5:44 AM

Um, er, desalination does not in itself affect sea water levels. All the water that is taken out plus all the water that is rejected recombines into one when the water that is taken out arrives back in the sea again.

Were the energy source to be an income source rather than from a fossil store, then the effects are relatively insignificant. Were it to be from a fossil store then one must factor in the volume of water that comes from combustion plus the effects of ice melt as a result of the CO2 that is emitted.

So there is something amiss with the basis of the above calculations. Don't shoot the messenger...

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#15
In reply to #9

Re: The Great Solar Dome Desalinization Project

04/30/2021 7:27 AM

The greening of a desert area adds to the global transpiration system, it holds water, while it is in circulation giving back and taking at all times, it will certainly hold a great deal of water and continue to over time, so yes it does reduce the amount of water in the sea....as we continue to add more land into the system, the amount of water that is in circulation will increase and so will the part that is in the soil and plants...This is about a solar system that uses the sun as the main power source for evaporation of the sea water, in case you missed the title of this thread...The ultra salty discharge has several different possibilities, one of which might be to replenish the salt flats, or the Salton sea, or as a source for useful minerals...maybe all of the above...

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#16
In reply to #15

Re: The Great Solar Dome Desalinization Project

04/30/2021 8:46 AM

Nope. Still doesn't affect sea levels.

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#21
In reply to #16

Re: The Great Solar Dome Desalinization Project

04/30/2021 3:17 PM

..."Desert irrigation geoengineering needs huge amounts of fresh water. A first year rise in soil water content to daily restoring the moisture content in the 3.433 m deep BNU-ESM soil column to be 800 mm thick across the global deserts based on present-day soil water contents is equivalent to 7.6 mm of global mean sea level (2722 billion tons) (Supplementary Fig. S12f and Table 1). Ornstein et al.9 estimated an initial requirement of 4900 billion tons fresh water per year for Sahara desert irrigation (which they prescribe as requiring 500 mm yr−1 of precipitation), though in their simulation, this becomes self-sustaining due to increased rainfall over newly forested deserts. "...

https://www.nature.com/articles/srep46443

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#18
In reply to #15

Re: The Great Solar Dome Desalinization Project

04/30/2021 10:42 AM

It is probably me, but I find it paradoxical whenever one who denies humanities changes to the global climate then proposes to "green a desert."

I guess progress comes slowly.

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#19
In reply to #18

Re: The Great Solar Dome Desalinization Project

04/30/2021 12:50 PM

I haven't changed,, I've been proposing greening deserts for 30+ years....

Isn't it funny that the CO2 levels have spiked, but not the temperature? or the sea level for that matter....