Treatment of environmental contaminants
View Patent ↗Contaminants, such as volatile organic compounds, are removed from an environmental medium, such as contaminated soil, rock, groundwater, waste water and the like, by treatment with a combination of a persulfate, such as a sodium persulfate, and hydrogen peroxide.
1. A method for oxidizing a contaminant present in an environmental medium selected from soil, rock, groundwater, wastewater and process water, said method comprising contacting the contaminant with a composition comprising a persulfate and hydrogen peroxide in the absence of a metal or chelated metal activator.
2. The method of claim 1 , wherein the persulfate is a monopersulfate or a dipersulfate.
3. The method of claim 1 , wherein the persulfate is sodium base, ammonium base, or potassium base.
4. The method of claim 1 wherein the persulfate is sodium persulfate.
5. The method of claim 1 wherein the mole ratio of persulfate to hydrogen peroxide is equal to from 1:20 to 20:1.
6. The method of claim 1 wherein the mole ratio of persulfate to hydrogen peroxide is equal to from 1:10 to 10:1.
7. The method of claim 1 wherein the persulfate and hydrogen peroxide are applied simultaneously to the medium.
8. The method of claim 1 wherein the persulfate and hydrogen peroxide are applied sequentially to the medium.
9. The method of claim 1 wherein the persulfate is applied to the medium prior to the application of the hydrogen peroxide.
10. The method of claim 1 wherein the hydrogen peroxide is applied to the medium prior to the application of the persulfate.
11. The method of claim 1 wherein the persulfate and hydrogen peroxide are applied to the medium sequentially in repeated applications.
12. The method of claim 11 wherein the repeated sequential additions of persulfate and hydrogen peroxide occur continuously.
13. The method of claim 11 wherein the repeated sequential additions of persulfate and hydrogen peroxide are separated by time intervals.
14. The method of claim 1 wherein the environmental medium is selected from soil, rock, groundwater, wastewater and process water.
15. The method of claim 1 , wherein the oxidation is performed in situ or ex situ.
16. The method of claim 1 , wherein the composition is introduced into the environmental medium in sufficient quantities and under conditions to oxidize substantially all of the contaminants in the medium.