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US 2026/0084993 A1Published application
Methods and systems for treating water with an oxidant and uv light
AssigneeTrojan Technologies Group Ulc
InventorsMihaela STEFAN, Michael Sasges, Ferdinando Crapulli
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Abstract
Methods and systems are provided for treating water to remove urea from the water by controlling the pH of the water to be in a range of from 3.5 to 5, adding an oxidant to the water, and then subjecting the water to UV radiation to decompose the urea.
Claims28
A method for treating water to remove urea from the water, the method comprising:
- adding a sufficient amount of a pH adjusting agent to the water to control the pH of the water to be in a range of from 3.5 to 5;
- adding a chlorine-containing agent to the water;
- and
- then irradiating the water with UV radiation to decompose the urea in the water so that at least 60% of the urea in the water is removed.
1 more element
A system for treating a water stream to remove urea from the water stream, the system comprising:
- a UV reactor that is configured to receive the water stream and irradiate it with UV radiation to provide a UV-treated water stream;
- an acid source that is arranged upstream of the UV reactor and is configured to add acid to the water stream;
- a chlorine source that is arranged upstream of the UV reactor and is configured to add a chlorine-containing agent to the water stream;
- a controller that includes a processor;
- an upstream pH meter that is arranged upstream of the UV reactor and is configured to measure the pH of the water stream and send a signal to the controller based on the measured pH;
- and
- an upstream TOC analyzer that is arranged upstream of the UV reactor and is configured to measure a TOC concentration in the water stream and send a signal to the controller based on the measured TOC concentration,
- wherein the controller is configured to compare the measured TOC concentration with a threshold value, and if the measured TOC concentration exceeds the threshold value, (i) send a control signal to control the acid source based on the measured pH so that an amount of acid is added to the water stream to control the pH to be in a range of from 3.5 to 5;
- and (ii) send a control signal to control the chlorine source so that the chlorine-containing agent is added to the water stream.
6 more elements
A system for treating a water stream to remove urea from the water stream, the system comprising:
- a UV reactor that is configured to receive the water stream and irradiate it with UV radiation to provide a UV-treated water stream;
- an acid source that is arranged upstream of the UV reactor and is configured to add acid to the water stream;
- an oxidant source that is arranged upstream of the UV reactor and is configured to add an oxidant to the water stream;
- a controller that includes a processor;
- an upstream pH meter that is arranged upstream of the UV reactor and is configured to measure the pH of the water stream and send a signal to the controller based on the measured pH;
- and
- an upstream TOC analyzer that is arranged upstream of the UV reactor, and includes (i) a first TOC analyzer that is sensitive to urea that is configured to measure a first TOC concentration of the water stream and send a signal to the controller based on the measured first TOC concentration;
- (ii) a second TOC analyzer that is not sensitive to urea that is configured to measure a second TOC concentration of the water stream and send a signal to the controller based on the measured second TOC concentration;
- wherein the controller is configured to calculate a difference between the measured first TOC concentration and the measured second TOC concentration, and if the difference exceeds a threshold value, (i) send a control signal to control the acid source based on the measured pH so that an amount of acid is added to adjust the pH of the water stream;
- and (ii) send a control signal to control the oxidant source so that the oxidant is added to the water stream.
7 more elements
Dependencies are inferred from the claim text.