Oxidation of aromatic hydrocarbons
First Claim
1. A method for remediating material contaminated with aromatic hydrocarbons, comprising:
- combining material contaminated with aromatic hydrocarbons, catalyst, and a first oxidant other than ozone, to form a mixture, wherein said mixture includes as said catalyst at least about 2 parts by weight of metallic iron and at least about 2 parts by weight of nano-titania, and at least about 10 parts by weight of said first oxidant, per 1000 parts by weight of contaminated material;
mixing the mixture; and
adding ozone gas to the mixture to oxidize and degrade said aromatic hydrocarbons.
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Accused Products
Abstract
A method for efficient, economical and rapid remediation of aromatic hydrocarbons, and especially polycyclic aromatic hydrocarbons (PAHs), in contaminated materials, such as soils, sludges, tars, sands and liquids using catalysts in conjunction with ozone, oxidants and surfactants. The method uses multistage catalytic oxidation to convert aromatic hydrocarbons into innocuous, biodegradable, or easily decomposed compounds such as carbon dioxide and carbonyl compounds, including but not limited to aldehydes, ketones, quinones and carboxylic acids. The method may be employed to treat dry and wet contaminated samples of large tonnage and offers an excellent alternative to incineration.
92 Citations
30 Claims
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1. A method for remediating material contaminated with aromatic hydrocarbons, comprising:
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combining material contaminated with aromatic hydrocarbons, catalyst, and a first oxidant other than ozone, to form a mixture, wherein said mixture includes as said catalyst at least about 2 parts by weight of metallic iron and at least about 2 parts by weight of nano-titania, and at least about 10 parts by weight of said first oxidant, per 1000 parts by weight of contaminated material; mixing the mixture; and adding ozone gas to the mixture to oxidize and degrade said aromatic hydrocarbons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for remediating material contaminated with aromatic hydrocarbons, comprising:
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combining contaminated material of less than one-half inch in particle size with water in an amount of approximately 0 to 500 parts by weight per 1000 parts by weight of contaminated material, catalysts, wherein one catalyst is metallic iron which is provided in an amount of approximately 2 to 100 parts by weight per 1000 parts by weight of contaminated material, and a second catalyst, wherein the second catalyst is nano-titania which is provided in an amount of approximately 2 to 100 parts by weight per 1000 parts by weight of contaminated material, surfactant, wherein the surfactant is bi-terpene which is provided in an amount of approximately 10 to 100 parts by weight per 1000 parts by weight of contaminated material, and a first oxidant other than ozone wherein the first oxidant is hydrogen peroxide which is provided as a 50% solution in an amount of approximately 10 to 50 parts by weight per 1000 parts by weight of contaminated material, to form a mixture; mixing the mixture; and adding ozone gas to the mixture in an amount of approximately 0.001 to 3.0 parts by weight per 1 part by weight of aromatic hydrocarbons in the material.
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30. A method for remediating material contaminated with aromatic hydrocarbons, comprising:
- combining material contaminated with aromatic hydrocarbons, catalyst, and a first oxidant other than ozone, to form a mixture, wherein said mixture includes at least about 10 parts by weight of said first oxidant per 1000 parts by weight of contaminated material;
mixing the mixture; and
adding ozone gas to the mixture to oxidize and degrade said aromatic hydrocarbons, wherein the catalyst comprises metallic iron and nano-titania and is located on impellor blades, baffles, metal baffles, ceramic baffles, vanes, paddles, meshes, grids, gratings, beds, deflectors, reaction vessel walls or combinations thereof.
- combining material contaminated with aromatic hydrocarbons, catalyst, and a first oxidant other than ozone, to form a mixture, wherein said mixture includes at least about 10 parts by weight of said first oxidant per 1000 parts by weight of contaminated material;
Specification