Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-10-25
1980-07-29
Wyse, Thomas G.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 53, B03D 100, C02C 502
Patent
active
042149878
ABSTRACT:
In a first stage, a flow of wastewater is adjusted to near zero streaming potential by injecting a mineral acid into the wastewater. The thus adjusted flow enters a basin where it is subjected to a decreasing gradient of small bubbles to form and separate off a first buoyant floc from the flow of wastewater. The flow of wastewater then passes to a second stage. In the second stage, a metal coagulant is injected into the wastewater, and the wastewater and coagulant enter a coagulation cell into which dense quantities of bubbles are supplied. Buoyant composites of particulates, coagulant and bubbles are formed in the cell. These composites leave the cell together with the wastewater flow and enter a second flotation basin where a second buoyant floc is separated off. The first and second floc combined have a higher solids content, have a lesser relative volume, and have physical properties such that valuable materials are more readily recovered therefrom than from a floc that would be formed if the wastewater were subjected to the second stage only.
REFERENCES:
patent: 3510001 (1970-05-01), Baer et al.
patent: 3723712 (1973-03-01), Komline et al.
patent: 3783114 (1974-01-01), Ishii et al.
patent: 3959131 (1976-05-01), Ramirez et al.
patent: 4012319 (1977-03-01), Ramirez et al.
patent: 4108768 (1978-08-01), Sebelik et al.
Dravo Corporation
Wyse Thomas G.
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