Advanced oxidation process for ex-situ groundwater remediation

Patent metadata

Field	Value
Publication number	US-10494281-B2
Application number	US-201615002474-A
Country	US
Kind code	B2
Filing date	Jan 21, 2016
Priority date	Jan 21, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

According to various aspects and embodiments, a system and method for treated contaminated groundwater is provided. The groundwater is contaminated with an initial concentration of recalcitrant organic contaminant. According to some embodiments, the contaminated groundwater is treated by introducing a persulfate to produce a first treated aqueous solution and then exposing the first treated aqueous solution to ultraviolet light to produce a second treated aqueous solution. The second treated aqueous solution may have a concentration of the recalcitrant organic contaminant that is at least 50% less than the initial concentration of recalcitrant organic contaminant.

First claim

What is claimed is:

1. A method of treating contaminated groundwater, comprising:
providing a contaminated groundwater having an initial concentration of a recalcitrant organic contaminant to be treated;
measuring a total organic carbon (TOC) value of the contaminated groundwater to be treated;
introducing a persulfate to the contaminated groundwater to produce a first treated aqueous solution; and
exposing the first treated aqueous solution to ultraviolet light to produce a second treated aqueous solution, the second treated aqueous solution having a concentration of the recalcitrant organic contaminant that is at least 50% less than the initial concentration of recalcitrant organic contaminant, wherein a rate at which the persulfate is introduced to the contaminated groundwater and a dose of the ultraviolet light is adjusted based on the measured TOC value.

2. The method of claim 1 , wherein adjusting a dose of the ultraviolet light comprises at least one of adjusting an intensity of the ultraviolet light and adjusting an exposure time of the ultraviolet light to the first treated aqueous solution.

3. The method of claim 2 , wherein adjusting the exposure time of the ultraviolet light comprises adjusting a flow rate of the first treated aqueous solution.

4. The method of claim 2 , wherein adjusting the exposure time of the ultraviolet light comprises adjusting a residence time of the first treated aqueous solution in a reactor.

5. The method of claim 1 , further comprising measuring a TOC value of the second treated aqueous solution.

6. The method of claim 5 , further comprising recirculating at least a portion of the second treated aqueous solution to a point upstream from the introduction of the persulfate based on the measured TOC value of the second treated aqueous solution.

7. The method of claim 5 , further comprising adjusting at least one of a rate at which the persulfate is introduced to the contaminated groundwater and a dose of the ultraviolet light based on the measured TOC value of the second treated aqueous solution.

8. The method of claim 1 , wherein the first treated aqueous solution is a first treated stream and the second treated aqueous solution is a second treated stream and the persulfate is introduced to the contaminated groundwater upstream from the exposure of the first treated stream to the ultraviolet light.

9. The method of claim 1 , wherein the concentration of recalcitrant organic contaminant in the second treated aqueous solution is at least 99% less than the initial concentration of contaminant.

10. The method of claim 1 , further comprising pretreating the contaminated groundwater.

11. The method of claim 10 , wherein pretreating the contaminated groundwater comprises introducing the contaminated groundwater to a media filter prior to introducing the persulfate.

12. The method of claim 1 , wherein the contaminated groundwater is introduced to the persulfate and exposed to the ultraviolet light in a single pass.

13. The method of claim 1 , wherein the second treated aqueous solution is potable water.

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

15. A system for treated contaminated groundwater, comprising:
a source of contaminated groundwater having an initial concentration of a recalcitrant organic contaminant;
a TOC concentration sensor in fluid communication with the contaminated groundwater;
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
a controller in communication with the TOC concentration sensor and configured to control a rate at which the persulfate is introduced to the contaminated groundwater and a dose of irradiation applied by the actinic radiation source based on an output signal from the TOC concentration sensor.

16. The system of claim 15 , 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.

17. The system of claim 16 , wherein the controller is configured to control the dose of irradiation by controlling a residence time of the contaminated groundwater in the reactor.

18. The system of claim 15 , wherein the controller is configured to control the dose of irradiation by controlling a flow rate of the contaminated groundwater.

19. The system of claim 18 , wherein the actinic radiation source is positioned downstream from the source of persulfate.

20. The system of claim 15 , wherein the TOC concentration sensor is positioned upstream from the source of persulfate.

21. The system of claim 20 , wherein the TOC concentration sensor is a first TOC concentration sensor and the system further comprises a second TOC concentration sensor in communication with the controller and positioned downstream from the actinic radiation source.

22. The system of claim 21 , wherein the controller is configured to control at least one of the rate at which the persulfate is introduced to the contaminated groundwater and a dose of irradiation applied by the actinic radiation source, based on an output signal from the second TOC concentration sensor.

23. The system of claim 22 , further comprising a valve fluidly connected to a treated water exiting the actinic radiation source, and the controller is configured to control the valve based on the output signal from the second TOC concentration sensor.

24. The system of claim 15 , further comprising a media filter positioned upstream from the source of persulfate.

25. The system of claim 15 , wherein the system is a mobile-based platform.

26. The method of claim 1 , wherein the recalcitrant organic contaminant is selected from chlorate, bromate, methanol, ethanol, isopropanol, butanol, pentanol, hexanol, tert butyl alcohol (TBA), 1,2,3-trichloropropane (1,2,3-TCP), 1,1-dichloroethane, 1,2-dichloroethane, trihalomethanes, trichloromethane, monochlorodibromomethane, bromomethane, chloromethane, monochloroacetic acid, dichloroacetic acid, iodoacetic acid, tetrachloroethene, trichloroethene, 1,2-cis-dichloroethene, 1,2-trans-dichloroethene, vinyl chloride, PFOA, PFOS, PFNA, acetylene, dichloroethylene, TCE trichloroethylene, PCE tetrachloroethylene, 1,4-dioxane, formaldehyde, diethyl ether, polyethylene glycol, methyl tertbutyl ether (MTBE), haloacetic acid, trichloroaceticacid, monochloroaceticacid, monochlorodibromoacetic acid, iodoacetic acid, 2-pentanone (MPK), butanone (MEK), methylamine, ethanolamine, diphenylamine, aniline, piperidine, methylethanolamine, trimethylamine, nitrosamine, NDMA, N-nitrosodimethylamine, bacteria, mold, fungi, virus, enterovirus, norovirus, quaternary ammonium alkyl halide, acetaminophen, androstenedione, atrazine, benzo[a]pyrene, caffeine, carbamazepine, DDT, DEET, diazepam, diclofenac, dilantin, erythromycin, estradiol, estriol, estrone, ethinylestradiol, fluorene, fluoxetine, galaxolide, gemfibrozil, hydrocodone, ibuprofen, iopromide, lindane, meprobamate, metolachlor, musk ketone, naproxen, oxybenzone, pentoxifylline, progesterone, sulfamethoxazole, TCEP, testosterone, triclosan, trimethoprim, acrylonitrile, vinyl chloride, propylene, styrene, urethane, hex

Assignees

• Evoqua Water Tech Llc

Inventors

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

Classifications

• C02F9/00 Primary

  Multistage treatment of water, waste water or sewage · CPC title

• C02F2209/40

  Liquid flow rate · CPC title

• C02F2101/34

  containing oxygen · CPC title

• C02F1/4695

  electrodeionisation · CPC title

• C02F1/42

  by ion-exchange (ion-exchange in general B01J) · CPC title