Chemical oxidation of volatile organic compounds
First Claim
1. A method for oxidizing volatile organic compounds in soil comprising the steps of:
- a. Introducing solid phase water soluble peroxygen compound to the soil to satisfy at least most of the soil oxidant demand;
b. Introducing a permanganate into the soil; and
c. Oxidizing volatile organic compounds in the soil with the permanganate.
2 Assignments
0 Petitions
Accused Products
Abstract
Volatile organic compounds are removed from contaminated soil by introducing one or both a water soluble peroxygen compound, such as a persulfate, and a permanganate into the soil, either in situ or ex situ, in amounts and under conditions wherein both the soil oxidant demand is satisfied and volatile organic compounds in the soil are oxidized. In a preferred embodiment, when both are used the peroxygen satisfies the soil oxidant demand and the permanganate oxidizes the volatile organic compounds. Sodium persulfate is the preferred persulfate and potassium permanganate is the preferred permanganate. The persulfate and the permanganate may be added to the soil sequentially, or may be mixed together and added as an aqueous solution.
60 Citations
41 Claims
-
1. A method for oxidizing volatile organic compounds in soil comprising the steps of:
-
a. Introducing solid phase water soluble peroxygen compound to the soil to satisfy at least most of the soil oxidant demand; b. Introducing a permanganate into the soil; and c. Oxidizing volatile organic compounds in the soil with the permanganate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
- 14. A method for oxidizing volatile organic compounds in a volume of soil in situ in the presence of divalent metal cations within the soil comprising the step of introducing persulfate into the soil to react with the metal cations to form sulfate free radicals that oxidize volatile organic compounds in the soil.
- 18. A method for oxidizing volatile organic compounds in an identified volume of soil comprising the steps of introducing oxidizing agent to the soil in amounts and under conditions sufficient a) to satisfy substantially all the soil oxidant demand and, b) to oxidize at least most of the volatile organic compounds in the soil volume.
- 22. A method for oxidizing subsurface volatile organic compounds in groundwater, comprising creating one or more zones of material in the path of the groundwater, the zones having sufficient permeability to allow the groundwater to pass through the zones, wherein the step of creating the zones of material includes forming manganese dioxide precipitate within the material of the zones to react with and oxidize the volatile organic compounds within the groundwater passing through the zones, the manganese dioxide precipitate being formed in sufficient quantity to reduce the quantity of the volatile organic compounds in the groundwater passing through the zones to acceptable levels before the groundwater leaves all of the zones.
-
25. A method for the in situ clean up of site of land contaminated with volatile organic compounds comprising the steps of
a) identifying a volume of contaminated soil at the site; -
b) using a first oxidant to oxidize most of the oxidant demand of the soil constituents in the identified volume by introducing the first oxidant into the identified volume; and c) using a second oxidant, different from the first oxidant, to oxidize most of the volatile organic compounds in the identified volume by introducing the second oxidant into the identified volume. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. A method for the in situ oxidizing of volatile organic compounds in a volume of soil by introducing persulfate into the volume of soil, followed by heating the soil to a temperature of from 40°
- C. to 99°
C. to form sulfate free radicals in sufficient quantities to oxidize substantially all the volatile organic compounds in the volume of soil. - View Dependent Claims (38, 39)
- C. to 99°
-
40. A method for oxidizing volatile organic compounds in a volume of soil by introducing into the volume of soil an aqueous solution of permanganate and persulfate and heating the soil to a temperature of between 40°
- C. to 99°
C. to form sulfate free radicals, wherein substantially all the volatile organic compounds in the soil are oxidized by the permanganate and the sulfate free radicals. - View Dependent Claims (41)
- C. to 99°
Specification