How can you desalinate water for drinking purposes?
Answer:
How much do you want? They make small survival evaporators for lifeboats that will supply 1 or 2 gallons a day each from sunlight. There are several ways to upscale it for larger groups but they use a lot of surface area.
Baxically, a solar panel of some kind is used to heat water, increasing the evaporation rate and the saturated air is then cooled in the shade and condensed water is drawn off from a reservoir at the bottom. For plans try "FARMING THE SEA" I don't know if the book is still available, try looking in Mother Earth News and the people who publish books there. Or, email me if you want as much detail as I can remember and then try to build it and see what works.
Reverse osmosis units are used for commercial scale stuff and in bulk produce good water at pennies to the gallon, but they use pumps, electricity and filtration memebranes that require constant care although they are much less expensive than steam evaporators.
Build a solar still
most water is ph6,which is not pure clean water,if you clean the water off every toxine,n every bacteria,every microbe,then it will be ph7 which is the purest water on the planet,but you need a massive chemical set to achieve this if you have the time,
There are a few different ways. Reverse osmosis is a filtering system that pushes the salt water through a membrane that the salt cannot pass through. There are hand operated pumps available to campers and rescue workers.
A still would boil off the water, to be reclaimed from the steam leaving the salt in the still.
Multi-stage flash distillation is a method of boiling off the water at lower temperatures by using a partial vacuum. Each stage gets more fresh water from the brine.
The technology of the membranes used in RO is making the RO the preferred method.
well contrary to that one answer u can make water even more pure if u wanna. it is a technique that can be used in any desert on the planet to keep a person from dieing from lack of water. u dig a pit and cover it with a tarp with a small stone in the middle. under that stone u have something to catch the water. its a survival thing the condesation is caught by the tarp and drips into a container of some sort. try it in ur back yard for example. the same process could be applied to saltwater or anything else.
After the first answer, I would have thought that said it all.
Solar stills are very easy to put together. If you are at the beach, all you need is a fairly large piece of clear plastic (such as a tarp) and a container to collect the water. Dig a hole in the sand until you start getting some seawater. Make sure that the hole is big enough to expose the bottom to the Sun. Place the container in the middle of the hole. Lay the plastic loosely over the hole and cover the edges with sand. Put a rock or a handful of sand into the middle of the tarp, so that it forms the shape of an inverted cone - the point directly over your container. As the water inside the hole heats up, it evaporates, rises, and condenses on the plastic, eventually trickling towards the point and dripping into the container.
This can be done to all kinds of non-potable water to harvest fresh drinking water - even from bodily fluids!
You can create less temporary versions using a larger container instead of a hole (painting it black or lining it with black plastic will give you more heat for evaporation) You can also orient this type of still to maximize the amount of sunlight.
Basically,
simmer saltwater with a glass dome over the top of it and make sure the sides are open for ventilation and drippage. Steam is freshwater moisture which will form on the inner surface of the glass dome - which will drip this freshwater from around the rim of the dome. The freshwater drippage can be channeled to a reservoir. Filter it, and 'presto' - you now have fresh drinking water! Boil all the water away, and the only thing left will be salt.
This process may have to be repeated several times to achieve maximum purity.
Think about it.
There's no such thing as saltwater rain.
This is just a rapid way to create simulated precipitation.
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The easiest way would be
to let nature do it automatically.
Collect rainwater.
Remove the salt.
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