System and method for oxidation of ammonia
AssigneeXogen Technologies Inc.
InventorsDorin BEJAN, Craig GAGNON
Life of this patent
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Abstract
The present disclosure relates generally to oxidation of ammonia using electrochemistry. Methods and systems may include at least one sensor to measure the concentration of ammonia in the effluent and/or the concentration of chlorine gas in the effluent. Methods and systems may also include at least one controller in communication with the sensor and/or the anode to reduce the current density of the anode generating the chlorine, and/or to change the flow rate of the ammonia containing water entering the reactor.
Claims20
A system for continuous treatment of a wastewater that includes ammonia, the system comprising:
- an inlet that accepts the wastewater to the system at a flow rate that can be varied by a flow rate controller;
- an electrochemical cell that generates chlorine from chloride ions present in the wastewater;
- a reaction zone that is sized and shaped to permit the generated chlorine to form hypochlorous acid, and to permit the hypochlorous acid to oxidize the ammonia;
- an outlet that discharges the treated wastewater from the system as an effluent;
- a sensor that measures the concentration of ammonia in the effluent;
- a sensor that measures the concentration of chlorine in the effluent;
- at least one controller in communication with:
- the ammonia sensor, the chlorine sensor, or both;
- and
- an anode of the electrochemical cell, the flow rate controller, or both,
- the at least one controller controlling at least one of:
- the current density of the anode of the electrochemical cell;
- and
- the flow rate of the wastewater accepted by the inlet.
A method for continuously treating a wastewater that includes ammonia, the method comprising:
- accepting the wastewater into an electrochemical cell at a variable flow rate;
- generating chlorine from chloride present in the wastewater using an anode of the electrochemical cell;
- generating a treated effluent by allowing the generated chlorine to form hypochlorous acid, and permitting the hypochlorous acid to oxidize the ammonia;
- measuring the concentration of ammonia in the effluent;
- measuring the concentration of chlorine in the effluent;
- controlling, based on at least one of the measured ammonia and chlorine concentrations:
- the current density of the anode of the electrochemical cell;
- the flow rate of the wastewater accepted by the electrochemical cell;
- or
- both.
Dependencies are inferred from the claim text.