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Tapered flocculation water treatment

  • US 6,197,190 B1
  • Filed: 04/07/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 04/07/1999
  • Status: Expired due to Fees
First Claim
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1. In an improved water treatment system for removing contaminants from raw water, said system comprising:

  • means for introducing into a single tank an influent of raw water that has been injected with a coagulating agent for neutralizing charged particles and a flocculating agent for agglomerating the neutralized particles;

    means for mixing, in a mixing area of said tank, the neutralized and agglomerated particles with a granular medium to increase the size and weight of the particles;

    means for directing the particles and water from the mixing area of said tank to a baffled quiescent zone for settling;

    wherein the improvement comprises means for further directing said water, free of settlement, in said quiescent zone through a buoyant medium to entrap unsettled particles; and

    means for conducting tapered flocculation in the mixing area of said tank with a turbine mixer having a plurality of radial blades of varying area, said blades tapered in decreasing area as the distance from the influent increases.

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