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Method and apparatus for purifying waste water

  • US 5,019,268 A
  • Filed: 06/15/1989
  • Issued: 05/28/1991
  • Est. Priority Date: 06/16/1988
  • Status: Expired due to Term
First Claim
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1. A process for the biological purification of waste water by treating with oxygenated gas using ascending co-currents in a single reactor containing as filtering means a lower fluidized bed zone and an upper fixed bed zone, the improvement wherein the beds contain particles consisting of expanded materials having a density lower than the density of water, the particles of the fixed bed being both smaller and lighter than the particles of the fluidized bed,wherein the arrangement of particles and beds satisfies the following equation:

  • ##EQU2## wherein D1 is the average diameter of the particles of the lower fluidized bed, S1 is the volume mass of the lower fluidized bed, D2 is the average diameter of the particles of the upper bed, S2 is the volume mass of the particles of the upper bed, and SL is the volume mass of the liquid; and

    wherein D1 is about 3 to about 15 mm, D2 is about 1 to about 10 mm, S1 is about 300 to bout 800 g/l;

    S2 is bout 20 to 100 g/l;

    the height of the fluidized bed being from about 0.2 to about 2 meters and the height of the fixed bed being from about 0.5 to about 3 meters.

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