Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Material level or thickness responsive
Patent
1978-07-19
1979-12-04
Adee, John
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Material level or thickness responsive
210106, 210263, 210DIG22, B01D 1502
Patent
active
041771443
ABSTRACT:
A control system to prevent the accumulation of excessive cellular material in a fluidized-bed reactor wherein waste water or other liquid to be processed is conducted upwardly at a velocity conducive to fluidization through a bed of particles which function as a carrier for the growth of the material. Included in the system is a separator column whose low end extends toward the fluidized bed and whose high end extends toward a head of liquid effluent which lies on the bed. In the course of reactor operation, the cellular material on the particles continues to grow, causing the bed to expand until its level reaches an alarm point indicative of excessive growth. This point is sensed to activate an agitator arrangement which effects shearing of the excess cellular material from the particles to produce in the separator column a mixture of sheared material and partially stripped carrier particles. The separator column is provided with a draw-off port somewhat below the surface of the effluent head, the exit flow rate at the draw-off port being adjusted so that the resultant upward flow velocity in the separator column is lower than the settling velocity of the carrier particles in the mixture but higher than that of the sheared material. As a consequence, the sheared material is washed away through the draw-off port, whereas the partially stripped carrier particles fall back into the fluidized bed. This activity continues until the level of the bed falls to a predetermined safety point below the alarm point when the activity is discontinued to complete the cycle which is not repeated until the bed again expands to reach the alarm point.
REFERENCES:
patent: 3846289 (1974-05-01), Jeris et al.
patent: 4009098 (1977-02-01), Jeris
patent: 4009099 (1977-02-01), Jeris
patent: 4032407 (1977-06-01), Scott et al.
patent: 4133759 (1979-01-01), Ikeda et al.
Hickey Robert F.
Owens Roger W.
Adee John
Ebert Michael
Ecolotrol, Inc.
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