2007-12-31 02:14:48 · 12 answers · asked by Harinath R 1 in Environment ➔ Conservation
Necessity is the mother of invention!!!!!! This may be option left.
2007-12-31 02:32:08 · answer #1 · answered by spice 5 · 0⤊ 0⤋
It is not particularly difficult and has been done in many different places. Many years ago, the standard Air Force survival pack contained an inflatable solar still that produced drinking water from sea water by evaporation and recondensation. Falling film evaporation has also been used in commercial scale desalination facilities, though reverse osmosis has proven to be more economical.
2007-12-31 07:37:45 · answer #2 · answered by Anonymous · 0⤊ 0⤋
its cost really consumes all the money we have.
2007-12-31 04:46:04 · answer #3 · answered by knock you out cos i m here!!!!!! 2 · 0⤊ 0⤋
Corporations make it difficult - not enough profit margin.....
Come on, this can be done, and cheaply too. Hello?? Solar engery to HEAT the water to Steam!! Then reclaim the steam to condense into water. EURKEA!! If i was only as dumb as a scienctist.....
2007-12-31 04:25:19 · answer #4 · answered by mstr_gekko 3 · 0⤊ 1⤋
you make salt from sea water by evaporation.
sea water is not just salt
it has a collection of other elements
and it is very expensive to get drinking water from sea water
The whole world would have been doing it by now if it was easy
2007-12-31 04:16:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
A couple of factors work against relying on evaporation to produce drinkable water: economics, time and space.
On average it costs about $200 to move an acre foot of water (around 326,000 gallons) into a water supply system. This cost skyrockets to $1,000 to move desalinated seawater into a comparable water supply system. This is using a heat driven process that is much more efficient than evaporation (see first link below).
It's estimated that to produce fresh water from salt water via evaporation on a level that could service even a small community would cost over $3,000 per acre foot.
Even if you had a number of retaining ponds and water collection panels, only around 1,200 gallons of "moderately" desalinated water could be produced over 24 hours.
Which now goes to the area needed to provide an acceptable amount of fresh water via evaporation. Retaining ponds and collection panels wouldn't need to be measured in feet available, but miles!
2007-12-31 04:01:36 · answer #6 · answered by Andy 5 · 0⤊ 0⤋
the main cost is energy so it is easyer to just use fresh water more efficiently.
that's what they used to do with desal. then they moved on to membranes which use less power and now they are moving onto vacuum freezing which will use even less power.
2007-12-31 03:31:39 · answer #7 · answered by Gengi 5 · 0⤊ 0⤋
energy costs. The sun evaporates sea water, of course, but to speed up the process, you heat the sea water, which takes lots of energy. Additional energy is expended condensing the water vapor to collect the desalinized water.
2007-12-31 02:25:41 · answer #8 · answered by Computer Guy 7 · 2⤊ 0⤋
You can make drinking water from salt water but herein lies the problem - it is too expensive.
To answer your question, if you use evaporation, all you will have left is salt not water.
2007-12-31 02:23:16 · answer #9 · answered by Orion777 5 · 0⤊ 0⤋
it's a smart idea, but all our rich governments care about is money, something that would be wasted by this
they're just too cheap
2007-12-31 02:22:24 · answer #10 · answered by Anonymous · 0⤊ 1⤋