Method for continuous supply of superoxide-containing peracetate oxidant solution
A method for continuous supply of peracetate oxidant solution with activity to generate to generate reactive oxygen species includes production processing in a liquid stream starting with a feed water and sequentially adding alkali concentrate, hydrogen peroxide solution and acetyl donor and introducing a resulting peracetate oxidant solution into a product buffer tank from which the peracetate oxidant solution is dispensed for use as a reactive oxygen species-generating oxidant, In the product buffer tank peracetate oxidant solution has a pH in a range of from pH 10 to pH 12, a molar ratio of peracetate anions to peracid in a range of from 60:1 to 6000:1 and a molar ratio of peracetate anions to hydrogen peroxide of greater than 16:1.
1. A method for continuous supply of superoxide-containing peracetate oxidant solution with activity to generate reactive oxygen species for oxidative treatment, the method comprising:
production processing in a liquid stream, comprising:
providing a feed of the liquid stream comprising an alkaline hydrogen peroxide and superoxide solution composition;
after the providing, adding an acetyl donor to the liquid stream to react in the liquid stream to form a peracetate-superoxide oxidant solution in the liquid stream;
introducing the liquid stream with the peracetate-superoxide oxidant solution into a product buffer tank to collect the peracetate-superoxide oxidant solution in the product buffer tank; and
dispensing the peracetate-superoxide oxidant solution from the product buffer tank for use as an oxidant; and
wherein as introduced into the product buffer tank the peracetate-superoxide oxidant solution has a pH in a range of from about pH 10.5 to about pH 13.
2. The method of claim 1 , comprising evolving oxygen gas from the peracetate-superoxide oxidant solution in the product tank and venting evolved oxygen gas through a gas vent of the product buffer tank.
3. The method of claim 1 , wherein the production processing comprises, prior to adding the acetyl donor, adding a hydrogen peroxide solution to the liquid stream to adjust a peroxide to superoxide ratio in the liquid stream.
4. The method of claim 3 , wherein the production processing comprises, after the adding the hydrogen peroxide solution and prior to the adding the acetyl donor; adding an acid solution to the liquid stream to reduce a pH of the liquid stream to pH 13 or less.
5. The method of claim 4 , wherein the production processing comprises:
first mixing the liquid stream with a first mixer after the adding the hydrogen peroxide solution and prior to the adding the acid solution; and
second mixing the liquid stream with a second mixer after the adding the acid solution and prior to the adding the acetyl donor.
6. The method of claim 5 , wherein each said mixer is an in-line mixer.
7. The method of claim 1 , comprising metering of each of the feed of the liquid stream and a reagent stream comprising the acetyl donor added to the liquid stream through separate metering pumps.
8. The method of claim 7 , wherein the product buffer tank comprises a dual level switch having a feedback loop controlling the operation of the metering pumps based on monitored maximum and minimum liquid levels within the product buffer tank.
9. The method of claim 8 , comprising during the production processing, simultaneously operating the metering pumps at fixed rates.
10. The method of claim 9 , comprising periodically discontinuing the production processing by switching off operation of all of the metering pumps.
11. The method of claim 10 , wherein the dispensing comprises metering dispensation of the peracetate-superoxide oxidant solution from the product buffer tank through at least one product metering pump.
12. The method of claim 11 , wherein the dispensing comprises dispensing the peracetate-superoxide oxidant solution from the product buffer tank at a rate that is less than or equal to a rate of introduction of the peracetate-superoxide oxidant solution during the production processing.
13. The method of claim 12 , wherein a residence time of the peracetate-superoxide oxidant solution in the product buffer tank is 10 minutes or less.
14. The method of claim 13 , comprising adding the peracetate-superoxide oxidant solution dispensed from the product buffer tank during the dispensing to an impaired water for oxidative treatment of the impaired water.
15. The method of claim 14 , comprising generating singlet oxygen in the impaired water as a consequence of adding the peracetate-superoxide oxidant solution to the impaired water.
16. The method of claim 14 , comprising separating contaminants from the impaired water following the oxidative treatment of the impaired water.
17. The method of claim 1 , wherein the feed of the liquid stream comprises a molar ratio of sodium superoxide to sodium peroxide of at least 1.56:1.
18. The method of claim 17 , wherein the feed of the liquid stream comprises sodium superoxide at a concentration of at least 0.34% wt/vol.
19. The method of claim 17 , wherein the peracetate-superoxide oxidant solution as dispensed from the product buffer tank has a molar ratio of superoxide to peracetate of at least 1.5:1.
20. The method of claim 19 , wherein the peracetate-superoxide oxidant solution as dispensed from the product buffer tank comprises 0.5% to 1.5% sodium peracetate and sodium superoxide.