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Underdrain assembly for wastewater treatment

  • US 10,449,471 B1
  • Filed: 09/20/2017
  • Issued: 10/22/2019
  • Est. Priority Date: 09/20/2016
  • Status: Active Grant
First Claim
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1. In a wastewater treatment system having a filtration unit with a top, bottom, sidewalls and a filtration unit interior, an underdrain assembly within the filtration unit interior for supporting filter media and providing means for air and water flow to move through the filter media, comprising:

  • a flat, precast concrete underdrain plate having a top surface, an opposite bottom surface, a perimeter matching the shape of the filtration unit in which the plate is placed, and a thickness defined by a plate circumferential wall, said plate having a plurality of holes formed therein and extending from the plate bottom surface to the plate top surface, said plate bottom surface having a plurality of downwardly extending ridges forming a plurality of air pockets beneath the plate bottom surface;

    wherein the underdrain plate has two, generally central, cylindrical apertures formed therein, said apertures adapted to receive two pipes, one for water and one for air, said pipes extending through the plate apertures;

    wherein each hole has a hollow tube extending from the underdrain plate top surface down through each hole and protruding below the underdrain plate undersurface into an air pocket, each said tube providing means for the passage of air below the underdrain plate bottom surface through the underdrain plate top surface and through filter media resting on the underdrain plate top surface.

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