WILLIAM F WISE
Engineering in Weyers Cave, VA

4277341, Jul 7, 1981

Sep 6, 1979

6/073029

William F. Wise - Weyers Cave VA
Jesse E. Snyder - Staunton VA

Schramm, Inc. - West Chester PA

C02F 310

210602

A lagoon for wastewater treatment, having an aeration zone and a quiescent zone is provided with a collector in the form of a horizontally extending submerged tube filled with biological reaction media and having an array of openings on its underside for the entry of water into its interior. The collector tube is supported at its ends by vertical pipe sections extending upwardly from the floor of the lagoon. These pipe sections connect the ends of the collector tube to a discharge conduit. Provision is made for the introduction of air into the collector for backwashing the biological reaction media. The media within the tube, in cooperation with openings designed to produce a velocity gradient within a limited range, insure uniform flow and minimum disturbance of the quiescent zone so that a highly clarified effluent is produced. The biological media also provide a large surface area for the growth of nitrifying bacteria. Backwashing of the media within the collector tube causes nitrate-containing matter to settle on the floor of the lagoon below the collector, where denitrification takes place.