Wastewater Treatment System
AssigneeEvoqua Water Technologies LLC
InventorsThomas J Larsen, Mark Pamperin, John Hartwick
Life of this patent
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Abstract
A system and method for treating wastewater includes two or more biological reaction zones separated by chamber walls. The system and method for treating wastewater includes static recycle of a mixed liquor from a second biological reaction zone to a first biological reaction zone.
Claims39
A process for treating wastewater, comprising the steps of:
- introducing wastewater into a first moving biological reaction zone having an activated sludge at a first velocity to form a first mixed liquor;
- allowing the first mixed liquor to flow into a second moving biological reaction zone to form a second mixed liquor having a second velocity;
- and
- statically redirecting a portion of the second mixed liquor from the second biological reaction zone to the first biological reaction zone.
A process for recycling mixed liquor in an oxidation ditch having multiple adjacent moving biological reaction zones, the biological reaction zones sharing a common intermediate chamber wall, wherein the mixed liquor level of an outer biological reaction zone is higher than the mixed liquor level of an inner biological reaction zone such that the mixed liquor flows from the outer biological reaction zone to the inner biological reaction zone, the process comprising:
- statically redirecting the flow of the mixed liquor in the inner biological reaction zone to the outer biological reaction zone at a fluid velocity of two to four times an influent flow rate to the outer biological reaction zone.
A method for retrofitting an oxidation ditch having multiple adjacent moving biological reaction zones, the biological reaction zones sharing a common intermediate chamber wall, comprising:
- positioning at least one opening in the common intermediate chamber wall;
- and
- positioning a baffle along the common intermediate chamber wall and adjacent to the opening to statically recycle the mixed liquor from an inner biological reaction zone to an outer biological reaction zone through the opening at a rate of two to four times an influent flow rate to the outer biological reaction zone.
A wastewater treatment system comprising:
- multiple adjacent biological reaction zones, the biological reaction zones sharing a common intermediate chamber wall having at least one opening;
- and
- a baffle secured to the common intermediate chamber wall adjacent the opening at an angle to the common intermediate chamber wall, the baffle projecting into an inner zone of an inner biological reaction zone.
A wastewater treatment system comprising:
- multiple concentric biological reaction zones, the biological reaction zones sharing a common intermediate chamber wall having at least one opening;
- an influent stream fluidly connected to a wastewater source and an outer biological reaction zone of the wastewater treatment system;
- a baffle secured to the common intermediate chamber wall, the baffle projecting into an inner portion of an inner biological reaction zone of the wastewater treatment system;
- and
- an effluent stream fluidly connected to an inner biological reaction zone and a downstream point.
Dependencies are inferred from the claim text.