Patent ID: 7666302

Claim:
A pond and lake water treatment apparatus comprising: a water pump in fluid communication between water in a pond or lake and a water distribution manifold for delivering the water under pressure into said manifold; a plurality of fluidized bed cells arranged in parallel each of which is of an upwelling type having a central longitudinally extending first water conduit in fluid communication at an upper end thereof with said manifold; each of said fluidized bed cells containing a biologically active media, the water entering a bottom of said fluidized bed cell through said first water conduit and being directed upwardly through said biologically active media for discharge from said fluidized bed cell through a first discharge port; a plurality of denitrification cells each of which is paired with one said fluidized bed cell, each of said denitrification cells being of an upwelling type having a central longitudinally extending second water conduit in fluid communication at an upper end thereof with a corresponding discharge port of the paired said fluidized bed cell; each of said denitrification cells containing nitrate removing media, the water entering a bottom of said denitrification cell through said second water conduit from the paired said fluidized bed cell, the water being directed upwardly through said nitrate removing media for discharge from said denitrification cell back into the pond or lake through a second discharge port.