Advanced oxidation process methods for degasification of reactor vessel
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.
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.