Chemistry: physical processes
Patent
1978-04-26
1980-12-23
Krizmanich, George H.
Chemistry: physical processes
233 24, B04B 120, B04B 910
Patent
active
042405785
ABSTRACT:
A solid bowl decanter centrifuge comprising a solid, generally cylindrical bowl having a liquids outlet at one end and a solids outlet at the other end, and adapted to be rotated at a first speed. Inlet pipework enables influent to be introduced to the interior of the bowl. A scroll conveyor is mounted for rotation within the bowl at a second speed. A first motor has its output shaft coupled to the scroll conveyor whereby the motor speed determines the differential speed of the conveyor relative to the bowl. A control mechanism is adapted to measure the torque applied to the scroll conveyor and to control the speed of the scroll conveyor in dependence upon the measured torque, a second pump being adapted to pump flocculant into said inlet pipework at a rate dependent upon the torque controlled differential speed of the scroll conveyor.
REFERENCES:
patent: 2955753 (1960-10-01), O'Conor et al.
patent: 3126337 (1964-03-01), Smith
patent: 3734399 (1973-05-01), Oas
patent: 4073431 (1978-02-01), Jager
patent: 4085888 (1978-04-01), Jager
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