Apparatus and process for desalination combining freeze concentration, centrifugation, and reverse osmosis
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United States of America Patent
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Jun 3, 1986
Grant Date -
N/A
app pub date -
Oct 20, 1983
filing date -
Oct 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus comprising a freeze exchanger in which an aqueous mixture is indirectly cooled by a cooling fluid to produce an aqueous mixture containing ice; a centrifuge; a conduit for feeding an ice slurry from the freeze exchanger to the centrifuge; a heater; a conduit for feeding ice from the centrifuge to the heater to melt the ice; a water treatment apparatus; a conduit for feeding the water from the heater to the water treatment apparatus to condition the water for contact with a reverse osmosis membrane; a reverse osmosis apparatus; and a conduit for feeding the conditioned water to the reverse osmosis apparatus in which the water is purified by reverse osmosis. A method comprising feeding an aqueous mixture into indirect heat exchange with a cooling fluid to produce ice particles in the aqueous mixture and thus to form an ice slurry; centrifuging the ice slurry to separate the ice and form an aqueous effluent; melting the separated ice and treating the resulting water to remove components which damage a reverse osmosis membrane; and subjecting the treated water to reverse osmosis using a reverse osmosis membrane to produce potable water and an impure water stream.
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