Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1994-11-21
1996-02-20
Lithgow, Thomas M.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210741, 210744, 210805, 2102212, 261 361, 261DIG75, C02F 124, B01D 17035
Patent
active
054926300
ABSTRACT:
A method and apparatus for aeration of waste water in a dissolved air flotation waste water treatment system includes a container for receiving and retaining waste water for settling of heavy particles and flotation of light particles to the surface of the waste water. Waste water is removed from the container and supplied to a free standing tank. Pressure in the tank is maintained at a predetermined level through the injection of compressed air into the tank. Waste water removed from the tank is pumped through a multiple jet configuration wherein air from the tank is entrained in the waste water as the water is injected back into the tank. The aerated water is discharged from the tank back into the container, thereby providing an efficient aeration process. Aerating the water in a free standing tank separate from the container increases clarification quality as a result of reduced disturbance of the particles floated to the surface of the waste water and reduced need for chemical addition to the waste water.
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Grosskopf Michael W.
Roshanravan Mel
Darling International Inc.
Lithgow Thomas M.
Meier Harold E.
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