Date post: | 03-Jan-2016 |
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…methods to get
Fresh Waterout of ocean water
•Desalination–Distillation–Reverse Osmosis
•Freezing•…we get 13 million liters DAILY
from the ocean!
Distillation• Boil sea water to
vapor (H2, O2)
• Condense the vapor to pure H2O
• Requires lots of energy
Freezing• Freeze sea water to -
2oC• Salt is pushed out of
the ice crystals as they form-
• Melt ice to get pure H2O
• One-sixth the energy cost of distillation
Reverse Osmosis• Pump sea water
through filters (membranes) that block salt, but allow H2O molecules through.
• The newest & best technology available.
Filtering System• Different layers of the
filter• The first filter gets
the largest objects out of the water
• The last filter layer called the membrane rejects the salt
Mineral Resources• Nodules of Mn, Fe,
Cu, Ni, Co, & phosphates form on the abyssal plain (grow 1 mm every million years!)
• ALSO - we mine salt, bromine, & magnesium...
…but the “big daddy” is PETROLEUM!
• Oil, that is…• Black gold,Texas
tea…• 25% of world oil
supply comes from offshore drilling on the continental shelves.
AQUACULTURE• The farming of the ocean• 1/2 billion people world-wide
suffer from lack of protein• Ocean farms can produce much
more protein-rich food per acre than land farms
• Problems: pollution…