Liquid purification or separation – With precoat adding or applying means
Patent
1974-10-24
1976-04-20
Hart, Charles N.
Liquid purification or separation
With precoat adding or applying means
210386, 210396, 210400, B01D 3702
Patent
active
039518051
ABSTRACT:
From a water medium, a harvester recovers algae useful as animal feed. The harvester has a preferably endless, movable belt screen. A coating device puts a first coating of long fibers (such as glass fiber or asbestos mixed with paper fiber) onto one side of the belt screen. A container of algae in water discharges onto the first coating permitting much of the water to pass through it and the belt screen but holding back the algae largely as a second coating on the fibers. A second screen having finer openings than the first screen is disposed against the second coating. This second screen has openings large enough to pass the algae but small enough to hold back the fibers. A suction is applied to the second screen causing the algae and entrained water to move therethrough. Concurrently, a washer directs a stream through the first screen and through the first coating and so washes off the second coating of algae, the fine screen holding the fibers behind. A conduit carries the washed off algae from the second coating with some residual water into a centrifuge or other dryer for removing as much water as desired and leaving substantially pure algae for animal feed. Another washer removes the fibers from the screen. A second conduit carries the removed fibers back to the belt screen for reuse. The process of using the harvester is also disclosed.
REFERENCES:
patent: 813890 (1906-02-01), Herr
patent: 2525135 (1950-10-01), Huff
patent: 2653521 (1953-09-01), Ahlfors
patent: 2963160 (1960-12-01), Wennberg
patent: 3038789 (1962-06-01), Bennett et al.
patent: 3254768 (1966-06-01), Shimizu
patent: 3431200 (1969-03-01), Davis et al.
Hart Charles N.
Spitzer Robert H.
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