Water clarification process - using a fluidised bed

Abstract

Abstract Clarification of liquids according to FR 1,501,912 is extended to include the softening of the water by lime, sodium carbonate or caustic soda, as well at the elimination of smells and various pollutants by means of adsorbent bodies, such as activated carbon. The clarifier consists of a reservoir in the form of a rectangular parallelepiped surmounting a prismatic base. The ridge of the latter is directed downwards and is fed with the water to be treated through a pipe at the base. The water enters at such a speed that a charge of granular material, such as anthracite or quartz sand, is maintained in the fluidised state. The upper portion of the clarifier is provided with an assembly of equidistant parallel surfaces placed 4 cm apart and inclined at 45 degrees to the horizontal. Arrangement are made for removing the granular material from the fluidised bed, removing the impurities and returning the leaned material to the bed. Slaked lime is use for softening the water and is introduced into the water feed by a metering pump. The treated water is of an improved quality and the space occupied by the plant is reduced.

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