Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-08-02
1979-12-18
Castel, Benoit
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 15, 210202, C02C 510
Patent
active
041793668
ABSTRACT:
Effluent to be biologically purified is poured serially through three interconnected tanks with the first two tanks acting as activation tanks and the last tank acting as a post-clarification tank. After the concentration of activated sludge in the first tank has dropped to a predetermined value, the flow through the tanks is reversed so that the last tank, previously the post clarification tank, acts as one of the activation tank and the first tank, previously one of the activation tank, acts as the post clarification tank, while the middle tank continues to operate as the other of the activation tanks.
In one embodiment, an aerator is provided in each tank and the aerators in the first and last tanks are switched on or off depending upon the direction of flow of effluent. In another embodiment, two movable aerators are provided and are disposed in use, in those tanks which are acting for the time being as activation tanks.
REFERENCES:
patent: 3133017 (1964-05-01), Lambeth
patent: 3208734 (1965-09-01), Wood et al.
patent: 3382981 (1968-05-01), Hampton
patent: 3470092 (1969-09-01), Bernard
patent: 3497066 (1970-02-01), Nicol
patent: 3523889 (1970-08-01), Eis
patent: 3595783 (1971-07-01), Pflanz et al.
patent: 3715304 (1973-02-01), Hefermehl
Castel Benoit
Hultquist Steven J.
Union Carbide Corporation
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