Advanced oxidation process methods for degasification of reactor vessel

Patent metadata

Field	Value
Publication number	US-10934193-B2
Application number	US-201615571860-A
Country	US
Kind code	B2
Filing date	May 6, 2016
Priority date	May 7, 2015
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

According to various aspects and embodiments, a system and method for treating groundwater contaminated with an organic contaminant is provided. According to some embodiments, the contaminated groundwater is treated by introducing a persulfate to produce a first treated aqueous solution, exposing the first treated aqueous solution to ultraviolet light to produce a second treated aqueous solution and one or more gases, and removing the one or more gases generated from exposing the first treated aqueous solution to the ultraviolet light.

First claim

The invention claimed is:

1. A method of removing 1,4-dioxane from a groundwater, comprising:
providing a contaminated groundwater having an initial concentration of 1,4-dioxane of at least 25 ppb;
introducing a persulfate to the contaminated groundwater to produce a first treated aqueous solution;
exposing the first treated aqueous solution to ultraviolet light to produce a second treated aqueous solution and one or more gases from oxidation of the 1,4-dioxane, the second treated aqueous solution having a concentration of the 1,4-dioxane less than about 1 ppb; and
removing the one or more gases generated from exposing the first treated aqueous solution to the ultraviolet light.

2. The method of claim 1 , wherein exposing the first treated aqueous solution comprises introducing the first treated aqueous solution to a reactor vessel.

3. The method of claim 2 , wherein removing the one or more gases comprises removing the one or more gases from the reactor vessel.

4. The method of claim 3 , wherein the one or more gases are removed from the reactor vessel through a degasifier coupled to the reactor vessel.

5. The method of claim 2 , wherein removing the one or more gases comprises removing the one or more gases from a conduit exiting the reactor vessel.

6. The method of claim 2 , wherein the contaminated groundwater is introduced to the reactor vessel at a flow rate of at least 100 gallons per minute.

7. The method of claim 1 , further comprising directing the one or more gases and at least a portion of the second treated aqueous solution to a storage device, the storage device configured to remove at least a portion of the one or more gases.

8. The method of claim 7 , further comprising recirculating at least a portion of the second treated aqueous solution from the storage device to a point upstream from the introduction of the persulfate.

9. The method of claim 1 , further comprising introducing the contaminated groundwater to a media filter prior to introducing the persulfate.

10. The method of claim 1 , further comprising extracting the contaminated groundwater from a remediation site.

11. The method of claim 1 , wherein the contaminated groundwater has an initial 1,4-dioxane concentration of up to about 800 ppb.

12. A system for removing 1,4-dioxane from a groundwater, comprising:
a source of contaminated groundwater having an initial concentration of an 1,4-dioxane of at least 25 ppb;
a source of persulfate fluidly connected to the source of contaminated groundwater and configured to introduce a persulfate to the contaminated groundwater;
an actinic radiation source fluidly connected to the source of contaminated groundwater and configured to irradiate the contaminated groundwater and persulfate to oxidize the 1,4-dioxane in the contaminated groundwater to produce one or more gases;
at least one degasifier configured to remove the one or more gases from the irradiated groundwater.

13. The system of claim 12 , further comprising a reactor fluidly connected to the source of contaminated groundwater and the source of persulfate and configured to house the actinic radiation source.

14. The system of claim 13 , wherein at least one degasifier is coupled to the reactor.

15. The system of claim 14 , wherein the reactor is oriented horizontally.

16. The system of claim 13 , wherein at least one degasifier is coupled to a conduit exiting the reactor.

17. The system of claim 16 , wherein the reactor is oriented vertically.

18. The system of claim 13 , further comprising a storage device positioned downstream from the reactor, wherein at least one degasifier is coupled to the storage device.

19. The system of claim 12 , wherein at least one degasifier is coupled to a conduit in fluid communication with the source of persulfate.

20. The system of claim 12 , further comprising a media filter positioned upstream from the source of persulfate.

21. The system of claim 12 , wherein at least one degasifier is positioned upstream of the actinic radiation source.

Assignees

• Evoqua Water Tech Llc

Inventors

• Szczesniak Adam
• Wood Jonathan H
• Coulter Bruce L
• Hall Christopher

Classifications

• C02F1/20 Primary

  by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D) · CPC title

• C02F2101/36

  containing halogen · CPC title

• C02F2101/34

  containing oxygen · CPC title

• Y02A20/152

  Water filtration · CPC title

• C02F1/722 Primary

  Oxidation by peroxides · CPC title