System and method for indirect measurement of oxygen utilization rate and influent load for aeration control
AssigneeXylem Water Solutions U.S.A., Inc.
InventorsDennis Barnes, Wenjun Liu
Life of this patent
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Abstract
A method of optimizing a wastewater treatment plant includes: providing an oxidation ditch having a dissolved oxygen set-point and including: an aeration system having an aerobic zone; and an anoxic zone; measuring the oxidation-reduction potential of the anoxic zone; and based on the measured oxidation-reduction potential: increasing or decreasing the dissolved oxygen set-point; increasing or decreasing a dose of supplemental nutrients; and/or increasing a dose of supplemental carbon or metal salts.
Claims17
A method of optimizing a wastewater treatment plant, comprising:
- providing an oxidation ditch comprising:
- a first fraction of a ditch volume of the oxidation ditch comprising an aeration system comprising an aerobic zone having a dissolved oxygen set-point, the aeration system producing aerobic conditions in the aerobic zone;
- and
- a second fraction of the ditch volume of the oxidation ditch comprising an anoxic zone;
- indirectly measuring an oxygen uptake rate in the aerobic zone by measuring the oxidation-reduction potential of the anoxic zone;
- and
- based on the indirectly measured oxygen uptake rate in the aerobic zone:
- increasing or decreasing the dissolved oxygen set-point in the aerobic zone;
- and
- increasing or decreasing a dose of supplemental nutrients and/or a dose of supplemental carbon or metal salts.
A wastewater treatment plant system, comprising:
- an inlet zone;
- an oxidation ditch comprising:
- a first fraction of a ditch volume of the oxidation ditch comprising an aeration system comprising an aerobic zone having a dissolved oxygen set-point, the aeration system producing aerobic conditions in the aerobic zone;
- and
- a second fraction of the ditch volume of the oxidation ditch comprising an anoxic zone comprising an oxidation-reduction potential probe configured to indirectly measure an oxygen uptake rate in the aerobic zone by measuring the oxidation-reduction potential of the anoxic zone;
- wherein the dissolved oxygen set-point in the aerobic zone is varied based on the indirect measurement from the oxidation-reduction potential probe in the anoxic zone;
- and
- wherein a dose of supplemental nutrients and/or a dose of supplemental carbon or metal salts is increased or decreased based on the indirect measurement from the oxidation reduction potential probe in the anoxic zone.
A method of optimizing a wastewater treatment plant, comprising:
- providing a first reactor comprising a non-aerated anoxic zone and one or more downstream aeration reactors connected to the first reactor, wherein a mixed liquor containing oxygen is recirculated from the downstream aeration reactors to the first reactor;
- indirectly measuring an oxygen uptake rate in the aerobic zone by measuring the oxidation-reduction potential of the anoxic zone;
- and
- based on the indirectly measured oxidation-reduction potential of the anoxic zone:
- increasing or decreasing a dissolved oxygen set-point in the one or more downstream aeration reactors;
- and
- increasing or decreasing a dose of supplemental nutrients and/or a dose of supplemental carbon or metal salts.
Dependencies are inferred from the claim text.