Apparatus and method for purifying water

  • US 5,770,092 A
  • Filed: 03/12/1997
  • Issued: 06/23/1998
  • Est. Priority Date: 06/15/1994
  • Status: Expired due to Fees
First Claim
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1. A multi-stage apparatus for continuous waste water filtration, comprising:

  • a first tank provided with a waste water inlet pipe to supply waste water containing suspended solids to said tank, means for adding a coagulant to said waste water and an outlet pipe;

    a second tank receiving said mixture of waste water and coagulant from the outlet pipe, said second tank being sufficiently large to allow larger suspended solids to settle and being provided with a lower, openable port for discharge of said settled solids and having an upper weir for discharge of partially-cleared water;

    a continuously-driven, non-taut perforated belt, having a surface positioned to receive, at a first location, a stream of said discharged, partially-cleared water, the belt perforations being sized to enable the passage of clear water therethrough while retaining fine and coagulated solids on said surface for subsequent discharge at a second location, and said belt being non-taut to form a trough for retaining a body of water above the surface thereof;

    a load sensor in contact with said belt to determine the combined weight of said belt and the water retained thereon and to control a motor of said belt and the speed thereof as a function of said weight, whereby a microcake of less than 1 mm thickness of fine and coagulated solids is formed and retained on the surface of said belt thereby improving the filtering capacity of said belt;

    a water collection body being provided under said first location for water passing through said belt perforations, and a solids collection bin being provided at said second location, for collection of particles falling off said belt at said second location.

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