Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1990-04-20
1991-08-06
Bennet, Henry A.
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
62541, 62544, 62123, B01D 904, C02F 122, D01D 900
Patent
active
050374630
ABSTRACT:
A method of removing contaminants from an aqueous waste stream comprising feeding a contaminated aqueous liquid to the lower internal space of a feed tank and cooling the liquid in the tank to a temperature which results in precipitation of at least part of the contaminants; withdrawing the precipitated contaminants from the feed tank lower internal space; withdrawing aqueous liquid from the feed tank upper internal space and delivering it to a freezer; cooling the aqueous liquid in the freezer to convert at least part of the liquid to ice to produce an aqueous ice slurry; feeding aqueous ice slurry from the freezer to an aqueous ice slurry receiver; withdrawing aqueous ice slurry from the aqueous ice slurry receiver and recycling some of it to the freezer and some of it to the lower internal space of the feed tank; withdrawing aqueous ice slurry from the aqueous ice slurry receiver and delivering it to a central space of a separator-precipitate vessel; withdrawing aqueous ice slurry from the central space of the separator-precipitate vessel and delivering it to a lower internal space of an ice washer vessel; withdrawing precipitated contaminants from the lower internal space of the separator-precipitate vessel; washing the ice in the washer vessel and removing the washed ice therefrom; and withdrawing cold ice wash water from the washer vessel.
The details of the apparatus used in the method are also disclosed.
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Engdahl Gerald E.
Richardson James H.
Bennet Henry A.
Chicago Bridge & Iron Technical Services Company
Kilner C. B.
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