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water
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Desalination
DESALINATION Definitions:
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"The
basic process of desalination is not new. Salt water is pumped through
filters under high pressure, squeezing out minerals. Israel and Kuwait
have relied on desalination for decades, as have military vessels and cruise
ships." ... "Since the late 1980s, the price of taking salt out of sea
water has dropped from nearly $2,000 an acre-foot to $800 per acre-foot,
said Walter Winrow, vice president of Poseidon Resources."
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- 20030114
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- "Calif.
Studies Making Sea Water Drinkable." ... "For the
most part, desalination has long been prohibitively expensive as a source
of drinking water in California. But rising demand, dwindling supply, and
new technology that makes it cheaper to take the salt out of sea water
are changing the economics of desalination."
-AP via -Guardian.co.uk
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"...
the thorniest obstacle is that reverse osmosis technology --the process
of forcing water through a semi-permeable membrane that blocks out salt
molecules -- is still very expensive." ... "Pushing water through the membranes
takes a huge amount of electricity, which is why most desalination projects
are being built alongside electric power generation plants." ... "Desalination
has been a concept since the fourth century B.C., when Aristotle made his
proposal to condense seawater vapor. The first crude plant was installed
in 1862 in Key West, Fla., to support military personnel at Fort Zachary
Taylor."
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