Regulation of Onsite Peroxide Generation for Improved Peroxone Advanced Oxidative Process Control

Patent metadata

Field	Value
Publication number	US-2025059071-A1
Application number	US-202218562416-A
Country	US
Kind code	A1
Filing date	May 20, 2022
Priority date	May 20, 2021
Publication date	Feb 20, 2025
Grant date	—

Abstract

Systems for treating water are disclosed. The system includes an ozonation subsystem including a source of ozone configured to dissolve ozone into water from a source of water to produce ozonated water. The system further includes an electrochemical cell co-located with the ozonation subsystem having an inlet connectable to a source of electrolyte and an outlet. The electrochemical cell is configured to produce hydrogen peroxide from electrolyte from the source of electrolyte. The system additionally includes a mixing zone configured to receive the ozonated water, to receive the hydrogen peroxide from the outlet of the electrochemical cell, and to mix the ozonated water and hydrogen peroxide to form peroxone. Systems and methods of treating water, such as by selectively removing one or more emergent compounds from contaminated water, using the system are also disclosed.

First claim

What is claimed is:

1 . A water treatment system comprising:
an ozonation subsystem including a source of ozone configured to dissolve ozone into water from a source of water to produce ozonated water: an electrochemical cell co-located with the ozonation subsystem, having an inlet connectable to a source of electrolyte, configured to produce hydrogen peroxide from electrolyte from the source of electrolyte, and having an outlet; and a mixing zone configured to receive the ozonated water, to receive the hydrogen peroxide from the outlet of the electrochemical cell, and to form a mixture of the ozonated water and hydrogen peroxide.

2 . The system of claim 1 , wherein the source of water and source of electrolyte are the same source, the same source being a source of water to be treated.

3 . The system of claim 1 , further comprising a first conduit fluidically connecting the source of electrolyte to the inlet of the electrochemical cell and a second conduit fluidically connecting the outlet of the electrochemical cell to the ozonation subsystem.

4 . The system of claim 1 , further comprising a first conduit configured to provide the ozonated water from the ozonation subsystem to water to be treated and a second conduit configured to provide the hydrogen peroxide from the electrochemical cell to the water to be treated.

5 . The system of claim 4 , further comprising a third conduit configured to flow the water to be treated from a source of the water to be treated and including a first inlet coupled to an outlet of the ozonation subsystem configured to receive the ozonated water and a second inlet coupled to the outlet of the electrochemical cell and configured to receive the hydrogen peroxide from the electrochemical cell.

6 . The system of claim 5 , wherein the first inlet is upstream of the second inlet.

7 . The system of claim 5 , wherein the second inlet is upstream of the first inlet.

8 . The system of claim 5 , wherein the third conduit further comprises a product water outlet downstream of the first and second inlets.

9 . The system of claim 4 , wherein both the first conduit and the second conduit are fluidically coupled to a vessel in which water to be treated is mixed with the mixture of the ozonated water and hydrogen peroxide in a batch mode treatment process.

10 . The system of claim 1 , wherein the outlet of the electrochemical cell is fluidically coupled to a point of introduction in a conduit fluidically coupling the source of electrolyte to the inlet of the electrochemical cell.

11 . The system of claim 1 , wherein the source of electrolyte is a source of oxygenated water.

12 . The system of claim 11 , wherein the source of electrolyte includes a source of oxygen and a mixer configured to receive water and oxygen from the source of oxygen and to dissolve the oxygen into the water.

13 . The system of claim 11 , wherein the mixer is configured to saturate the oxygenated water with oxygen.

14 . The system of claim 1 , wherein the ozonation subsystem is configured to dissolve sufficient ozone into the water such that the ozonated water is saturated with ozone.

15 . The system of claim 1 , further comprising a sensor configured to measure a concentration of one or more contaminants in an aqueous solution passing through the system, the sensor positioned at one of an inlet or an outlet of the system.

16 . The system of claim 15 , further comprising a controller in communication with the sensor and configured to adjust one or more operating parameters of the system responsive to a measured concentration of the one or more contaminants.

17 . The system of claim 16 , where the one or more operating parameters of the system include one or more of power applied to the electrochemical cell, power applied to the ozone generator, or a flow rate of the electrolyte trough the electrochemical cell.

18 . The system of claim 16 , where the one or more operating parameters of the system includes an amount of oxygen dissolved in the electrolyte.

19 . The system of claim 1 , further comprising a sensor configured to measure a concentration of one of residual hydrogen peroxide or residual ozone in water treated by the system.

20 . The system of claim 19 , further comprising a controller in communication with the sensor and configured to adjust one or more operating parameters of the system responsive to a measured concentration of the one of residual hydrogen peroxide or residual ozone.

21 . The system of claim 20 , where the one or more operating parameters of the system include one or more of power applied to the electrochemical cell, power applied to the ozone generator, or a flow rate of the electrolyte trough the electrochemical cell.

22 . The system of claim 20 , where the one or more operating parameters of the system includes an amount of oxygen dissolved in the electrolyte.

23 . The system of claim 20 , where the one or more operating parameters of the system includes an amount of ozone dissolved in the ozonated water.

24 . The system of claim 1 , further comprising a storage tank fluidically coupled to the outlet of the electrochemical cell.

25 . The system of claim 24 , further comprising a controller configured to adjust one or both of a flow rate of hydrogen peroxide from the storage tank or a flow rate of gaseous ozone from the source of ozone based on one or more measured characteristics of the electrolyte or one or more characteristics of the ozonated water.

26 . The system of claim 1 , further comprising a controller configured to control a ratio of hydrogen peroxide to ozone received in the mixing zone to between about 10:1 and about 50:1.

27 . A method of treating water, the method comprising:
producing ozonated water with an ozonation subsystem including a source of ozone configured to dissolve ozone into water from a source of water: producing hydrogen peroxide in an electrochemical cell co-located with the source of ozone, having an inlet connectable to a source of electrolyte, configured to produce hydrogen peroxide from electrolyte from the source of electrolyte, and having an outlet; and mixing the ozonated water and hydrogen peroxide to form a mixture of the ozonated water and hydrogen peroxide in a mixing zone: and exposing water to be treated to the mixture of the ozonated water and hydrogen peroxide in a peroxone process.

28 . The method of claim 27 , wherein both water provided to the ozonation subsystem and the electrolyte are provided from a source of the water to be treated.

29 . The method of claim 27 , further comprising fluidically connecting the source of electrolyte to the inlet of the electrochemical cell and fluidically connecting the outlet of the electrochemical cell to the ozonation subsystem.

30 . The method of claim 27 , further comprising providing the ozonated water from the ozonation subsystem to water to be treated through a first conduit providing the hydrogen peroxide from the electrochemical cell to the water to be treated through a second conduit.

31 . The method of claim 30 , further comprising flowing the water to be treated from a source of the water to be treated through a third conduit including a first inlet coupled to an outlet of the ozonation subsystem configured to receive the ozonated

Assignees

• Evoqua Water Tech Llc

Inventors

• Griffis Joshua
• Dukes Simon P
• Satterfield Ben
• Chen Yang
• Gu George Y

Classifications

• C02F2305/023

  Reactive oxygen species, singlet oxygen, OH radical · CPC title

• C02F2209/40

  Liquid flow rate · CPC title

• C02F2209/38

  Gas flow rate · CPC title

• C02F2209/23

  O3 · CPC title

• C02F2209/22

  O2 · CPC title