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US 5,496,472 AGranted
Method and apparatus for denitrification of wastewater
AssigneeTetra Technologies, Inc.
InventorsDavid C. Slack, Gregory A. Ellard
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AssigneeTetra Technologies, Inc.
InventorsDavid C. Slack, Gregory A. Ellard
Estimating the term…
This invention relates to a method and apparatus of denitrification. The apparatus includes a weir block, a denitrification vessel having a wall surface, and filter media having microorganisms on their surfaces. The weir block may have a convex outer surface which is tangentially adjacent to and preferably contiguous with the upper end of the wall, whose lower end is in contact with the water in the denitrification vessel. The method may include passing the wastewater over the convex surface of the weir block, passing the water over the second surface of the substantially vertical wall and into the denitrification vessel while preferably maintaining substantially laminar flow and limiting the dissolved oxygen in the denitrification vessel, preferably to below about 5 mg/L and more preferably to below about 4 mg/L.
A method of removing nitrates from wastewater, comprising passing the wastewater over a weir having an outer weir surface with a convex shape and along a wall of denitrification vessel, said denitrification vessel comprising filter media having microorganisms on their surfaces, said wall having an inner surface that is contiguous with the convex outer weir surface, to provide substantially laminar flow of liquid from the weir outer surface to the inner surface of the wall.
A method for removing nitrates from wastewater, comprising the steps of:
A denitrification apparatus comprising a denitrification vessel for receiving wastewater having filter media with microorganisms on said filter media and a weir block having a convex outer surface, said weir block being configured such that the wastewater is capable of flowing over the convex outer surface and into the denitrification vessel, said denitrification vessel including a wall with an inner surface, wherein said convex outer surface of said weir block is contiguous with said inner surface of said wall, to provide substantially laminar flow of liquid from the weir outer surface to the inner surface of the wall.
A denitrification apparatus comprising a denitrification vessel having filter media with microorganisms on said filter media, a weir block with a convex outer surface and a wall with a substantially planar inner surface, wherein the upper end of the wall is adjacent to the convex surface of the weir block and the lower end of the wall is in contact with the wastewater in the denitrification vessel and wherein the inner surface of said wall is contiguous with the convex outer surface of the weir block, to provide substantially laminar flow of liquid from the weir outer surface to the inner surface of the wall.
Dependencies are inferred from the claim text.