Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1976-04-19
1978-04-18
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 13, 210 44, C02C 108
Patent
active
040850412
ABSTRACT:
Biological oxidation and flotation apparatus and method are disclosed for use in the treatment of sewage or other aqueous waste material by the activated sludge process. A treatment and flotation chamber is provided in which both biological oxidation and flotation take place. In some forms of the method and apparatus, a separate biological oxidation tank is also used prior to the treatment and flotation chamber.
The treatment and flotation chamber includes a quiescent zone at the top of the chamber that extends horizontally through at least the downstream part of the chamber, and extends downward at least about three inches blow the surface of the contents of the chamber. The contents of the chamber below the quiescent zone are continuously recirculated, for example by pumps whose inlets lie below the quiescent zone and which transfer a part of the aqueous material under treatment to the bottom of the chamber to be employed as the shearing liquid in a bubble shearing apparatus. The entire contents of any part of the treatment and flotation chamber over which the quiescent zone does not extend are also continuously recirculated, as are the entire contents of any separate biological oxidation tank.
Oxygen-containing gas bubbles are introduced into the system to provide oxygen for biological treatment of the aqueous material in any separate biological oxidation tank and in the treatment and flotation chamber, and to provide bubbles (supplemented by carbon dioxide and nitrogen, absorbed from the liquid medium) which attach themselves to suspended solid particles to form a float in the quiescent zone at the top of the treatment and flotation chamber. Substantially all of the oxygen-containing gas bubbles introduced below the quiescent zone in the treatment and flotation chamber are no larger than about 500 microns in diameter, with the bubble size measured under certain specified conditions. A maximum bubble size of about 200 microns produces improved results, 100 microns produces still better results, and a 50 micron maximum bubble diameter is preferred.
The oxygen-containing bubbles are introduced into the treatment and flotation chamber from gas in the free state, at a pressure, measured adjacent the outlet orifices of the bubble forming devices employed, that is approximately equal to the hydrostatic pressure of the liquid at that point.
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Fullerton Donald Griswold
Kyrias Gilbert Mowder
Weber Richard Baxter
FMC Corporation
Hart Charles N.
Spitzer Robert H.
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