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US 2014/0291253 A1Published application
System and method for measuring and treating a liquid stream
AssigneeEvoqua Water Technologies LLC
InventorBruce Lee Coulter
Life of this patent
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Abstract
A method and system of treating a liquid stream is provided. The water is treated by utilizing a free radical scavenging system and a free radical removal system. The free radical scavenging system can utilize actinic radiation with a free radical precursor compound, such as ammonium persulfate. The free radical removal system can comprise use of a reducing agent. The water may be further treated by utilizing ion exchange media and degasification apparatus. A control system may be utilized to measure and regulate addition of the precursor compound, the intensity of the actinic radiation, and addition of the reducing agent to the water.
Claims39
A system comprising:
- an oxidizing agent concentration sensor comprising an oxidizing agent conductivity cell, the oxidizing agent concentration sensor in fluid communication with a liquid stream;
- a source of reducing agent disposed to introduce the reducing agent to the liquid stream downstream of the oxidizing agent concentration sensor;
- a reducing agent concentration sensor comprising a reducing agent conductivity cell, the reducing agent concentration sensor in fluid communication with the liquid stream and located downstream of the source of reducing agent;
- and
- a controller configured to generate a control signal that regulates at least one of a rate of addition and an amount of the reducing agent introduced into the liquid stream based on at least one input signal from one of the oxidizing agent concentration sensor and the reducing agent concentration sensor.
2 more elements
A method for controlling introduction of a reducing agent to a liquid stream comprising:
- measuring a first conductivity of the liquid stream in a first conductivity cell;
- irradiating the liquid stream to provide an irradiated liquid stream;
- measuring a second conductivity of the irradiated liquid stream in the first conductivity cell;
- calculating the oxidizing agent concentration of the liquid stream based in part on the first conductivity measurement and the second conductivity measurement;
- introducing a reducing agent to the liquid stream to provide a reduced liquid stream;
- measuring a third conductivity of the reduced liquid stream in a second conductivity cell;
- irradiating the reduced liquid stream to provide an irradiated reduced liquid stream;
- measuring a fourth conductivity of the irradiated reduced liquid stream in the second conductivity cell;
- calculating the reducing agent concentration based in part on the third conductivity measurement and the fourth conductivity measurement;
- and
- regulating at least one of a rate of addition and an amount of the reducing agent introduced to the liquid stream based in part on the calculated oxidizing agent concentration and the calculated reducing agent concentration.
8 more elements
A method for measuring an oxidizing agent concentration and a reducing agent concentration in a liquid stream having a resistivity of at least about 15 megaohm-cm, the method comprising:
- measuring a first conductivity of the liquid stream in a first conductivity cell;
- irradiating the liquid stream to provide an irradiated liquid stream;
- measuring a second conductivity of the irradiated liquid stream in the first conductivity cell;
- calculating the oxidizing agent concentration of the liquid stream based in part on the first conductivity measurement and the second conductivity measurement;
- introducing a reducing agent to the liquid stream to provide a reduced liquid stream;
- measuring a third conductivity of the reduced liquid stream in a second conductivity cell;
- irradiating the reduced liquid stream to provide an irradiated reduced liquid stream;
- measuring a fourth conductivity of the irradiated reduced liquid stream in the second conductivity cell;
- and
- calculating the reducing agent concentration of the reduced liquid stream based in part on the third conductivity measurement and the fourth conductivity measurement.
7 more elements
A system comprising:
- a source of reducing agent;
- a controller configured to generate a control signal that regulates introduction of reducing agent from the source of reducing agent into a liquid stream to provide a reduced liquid stream;
- and
- a concentration sensor comprising a conductivity cell, the concentration sensor configured to receive a portion of the liquid stream and to measure an oxidizing agent concentration of the portion of the liquid stream, the concentration sensor further configured to receive a portion of the reduced liquid stream and to measure a reducing agent concentration of the portion of the reduced liquid stream;
- wherein the control signal is based in part on an input signal from the concentration sensor.
2 more elements
A method for controlling introduction of a reducing agent to a liquid stream comprising:
- introducing a portion of the liquid stream to a concentration sensor comprising a conductivity cell;
- measuring a conductivity of the portion of the liquid stream in the conductivity cell;
- irradiating the portion of the liquid stream to provide an irradiated liquid stream;
- measuring a conductivity of the irradiated liquid stream in the conductivity cell;
- calculating an oxidizing agent concentration of the liquid stream based in part on the conductivity of the portion of the liquid stream and the conductivity of the irradiated liquid stream;
- introducing a reducing agent to the liquid stream to provide a reduced liquid stream;
- introducing a portion of the reduced liquid stream to the concentration sensor;
- measuring a conductivity of the portion of the reduced liquid stream in the conductivity cell;
- irradiating the portion of the reduced liquid stream to provide an irradiated reduced liquid stream;
- measuring a conductivity of the irradiated liquid stream in the conductivity cell;
- calculating a reducing agent concentration of the reduced liquid stream based in part on the conductivity of the portion of the reduced liquid stream and the conductivity of the irradiated reduced liquid stream;
- and
- regulating introduction of the reducing agent to the liquid stream based in part on the oxidizing agent concentration and the reducing agent concentration.
10 more elements
Dependencies are inferred from the claim text.