Liquid purification or separation – Processes – Separating
Patent
1980-09-10
1984-02-28
Adee, John
Liquid purification or separation
Processes
Separating
2102211, 2105123, B04B 500
Patent
active
044340613
ABSTRACT:
A method and apparatus for continuously separating solids and liquid in a solids-liquid mixture are disclosed. In accordance with the invention, a separation zone for separating solids and liquids from a solids liquid mixture is provided in which the mixture is subjected to centrifugal force under low shear forces and low turbulence. In this zone, the flow rate is maintained to be less than the terminal settling velocity of the solids in the mixture. Further in accordance with the invention, the mixture is introduced into the separation zone from a zone of higher turbulence and higher flow rate than those of the separation zone, a minor part of the mixture in the other zone being removed to the separation zone. The major part of the mixture is removed from the other zone and discharged and returned to the mixture source in such a manner as to aerate the returned mixture. The separated solids are returned to the mixture source with the major part of the mixture. The separated solids and liquid are removed from the apparatus of the invention continuously. The invention is particularly useful in obtaining a highly clarified centrate from sewage sludge.
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Adee John
Cellu-Craft Inc.
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