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Potable Water - The Third Way.
"Brian Whatcott" wrote in message ... You've heard all about distilling water, and you've heard all about reverse osmosis, but you haven't heard about low-cost, low energy stills: they are brand new. Briefly: Take one forty ft vertical tube filled with saline. Take one forty ft vertical tube filled with fresh water. Connect them with a little engineering help - at the top. The boiling point of water at sea level pressure is about 100 deg C The boiling point of water at the top of a sealed 40 ft column of water is near ambient. So, it doesn't take much heat to boil the brackish water, and have it pass to the fresh column where it is slightly cooled to hold the near vacuum conditions at the boiling level. [An engineering effort of a U of Utah group I think] Brian Whatcott Altus OK Lame suggestion and unworkable on most boats. Ya gotta think outta the box, man. However, there is another way. I thought it up all by my lonesome. All you need is a reverse osmosis membrane. You put it into a chamber that is vented to atmosphere on the inside and to the ocean on the outside of the membrane. You lower it into the ocean to a depth of only 500 feet and the pressure of the water is enough to push fresh water through the membrane into the chamber. When it gets full you haul it up and empty in into your tanks. Reverse osmosis without any energy used to get it. Ain't Wilbur brilliant? Wilbur Hubbard |
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