Just read about a cheaper invention to change salt water to fresh water, or at least good enough for farm animals
Up to now, we require plenty of grid electricity to desalinate sea water
In a nutshell, these people claim to be able to fit their machine in a sea container, and use the sun (or waste heat), to heat the water and then trap the condensation
A snip from the article
I'll give you an analogy: if you have a shower in the morning, you'll see all the steam build up and you'll then see it condense on your cold mirror in the bathroom - that condensed water is actually pure water, he said. The basic idea is to warm salty water, and as we heat it up it creates steam. That steam can then transfer through the membrane ... it becomes liquid again as it cools down
This, if it is dinkum, would certainly help the rural folks, in the drought areas
LLD said
09:22 PM Apr 7, 2019
Also used in areas of low rainfall but heavy dew. The impressive solar desalination plant is at Port Augusta and used for hydroponic vegetables.
Yuglamron said
09:53 PM Apr 7, 2019
Sounds very impressive, But what happens to the residue. You will never get all of the H2O out of any salty water and the residue is of a very high salinity afterwards. So high in fact it is a pollutant in itself.
They never tell you about the effects at the desalination plants where the High Salinity residue is just returned to the sea where it has a huge impact on the sea life of all sorts.
So if you have a container sized plant out in the country, what do you do with the H.S.Brine?
Certainly no good for the land to irrigate or would we have dams full of the stuff. Like the Mine Tailing lagoons full of Arsenic and Heavy metals.
Izabarack said
11:25 AM Apr 8, 2019
Yuglamron wrote:
what do you do with the H.S.Brine?
Certainly no good for the land to irrigate or would we have dams full of the stuff.
The brine is sold on for a healthy profit and is in high demand.
Neighbour was recently involved in a water clean up process west of Brissy. The water processing has been done on this site for at least 6 years. Four dams, total area of 1.5 by 1.1 kilometers, up to 15 metres deep from drilling and Fracking processes. The cleaned up water is a problem to get rid of. Too pure to put in local creeks as it kills the aquatic life, so only a small amount is released at a time. Local farmers will have it if the company pipes it to them. Not good for crops until the cleaned up water sits on the ground long enough to pick up minerals and salts the crops can use.
The methane from the process I know of is cleaned up, compressed to about 6000 PSI and then used in a gas over diesel engine in mine trucks. The CO2 recovered in the methane clean up process becomes Dry Ice and on sold.
The solar still process has been in use for lots of years but not much use to people who live in Walgett, for example, is the rivers are dry and there is no contaminated or dirty water available to be cleaned up.
Iza
Yuglamron said
01:11 PM Apr 8, 2019
We learn something new everyday. Thank you for the further information.
Extraordinary Rendition said
09:55 PM Apr 8, 2019
It would be usefull to have a small scale desal device to get potable water out of smelly brackish creeks or estuarine waters. Sea water, even better, but a machine like that might be able to recycle your onboard water.
Just read about a cheaper invention to change salt water to fresh water, or at least good enough for farm animals
Up to now, we require plenty of grid electricity to desalinate sea water
In a nutshell, these people claim to be able to fit their machine in a sea container, and use the sun (or waste heat), to heat the water and then trap the condensation
A snip from the article
The website link is below
https://www.abc.net.au/news/2019-04-07/cheap-and-portable-filter-waste-water-innovation/10977368
This, if it is dinkum, would certainly help the rural folks, in the drought areas
Sounds very impressive, But what happens to the residue. You will never get all of the H2O out of any salty water and the residue is of a very high salinity afterwards. So high in fact it is a pollutant in itself.
They never tell you about the effects at the desalination plants where the High Salinity residue is just returned to the sea where it has a huge impact on the sea life of all sorts.
So if you have a container sized plant out in the country, what do you do with the H.S.Brine?
Certainly no good for the land to irrigate or would we have dams full of the stuff. Like the Mine Tailing lagoons full of Arsenic and Heavy metals.
The brine is sold on for a healthy profit and is in high demand.
Neighbour was recently involved in a water clean up process west of Brissy. The water processing has been done on this site for at least 6 years. Four dams, total area of 1.5 by 1.1 kilometers, up to 15 metres deep from drilling and Fracking processes. The cleaned up water is a problem to get rid of. Too pure to put in local creeks as it kills the aquatic life, so only a small amount is released at a time. Local farmers will have it if the company pipes it to them. Not good for crops until the cleaned up water sits on the ground long enough to pick up minerals and salts the crops can use.
The methane from the process I know of is cleaned up, compressed to about 6000 PSI and then used in a gas over diesel engine in mine trucks. The CO2 recovered in the methane clean up process becomes Dry Ice and on sold.
The solar still process has been in use for lots of years but not much use to people who live in Walgett, for example, is the rivers are dry and there is no contaminated or dirty water available to be cleaned up.
Iza
We learn something new everyday. Thank you for the further information.
Gday...
How myths about ABC are perpetuated
https://www.qut.edu.au/news?id=142488
http://www.xinhuanet.com/english/asiapacific/2019-04/08/c_137959851.htm
Cheers - John
It's not from the ABC. As it is a story about research done at QUT, how would you go if the link was posted on News dot com?
Iza