Remediation of environmental contaminants using a metal and a sulfur-containing compound

• US 6,039,882 A
• Filed: 10/30/1996
• Issued: 03/21/2000
• Est. Priority Date: 10/31/1995
• Status: Expired due to Fees

• Current Assignee: Dyncorp (DXC Technology Company), United States Of America As Represented By The Administrator Of The United States Environmental Protection Agency
• Original Assignee: Dyncorp (DXC Technology Company), United States Of America As Represented By The Administrator Of The United States Environmental Protection Agency
• Inventors: Wolfe, N. Lee, Cipollone, Mark G.
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): HOEY, BETSEY MORRISON
• Application Number:
  US08/739,842
• Time in Patent Office: 1,238 Days
• Field of Search: 210/719, 210/747, 210/757, 210/908, 405/128
• US Class Current: 588/316
• CPC Class Codes: B09C 1/002 involving in-situ ground water treatment
• CPC Class Codes: B09C 1/08 chemically
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/5236 using inorganic agents
• CPC Class Codes: C02F 1/54 using organic material
• CPC Class Codes: C02F 1/705 Reduction by metals
• CPC Class Codes: C02F 2101/322 Volatile compounds, e.g. benzene
• CPC Class Codes: C02F 2101/36 containing halogen
• CPC Class Codes: C02F 2101/363 PCB's; PCP's
• CPC Class Codes: C02F 2103/30 from the textile industry
• CPC Class Codes: Y02W 10/37 using solar energy
• CPC Class Codes: Y10S 210/908 Organic

Abstract

A method and composition for the remediation of environmental contaminants in soil, sediment, aquifer material, water, or containers in which contaminants were contained, wherein contaminants are reacted with a remediating composition comprising a metal and a sulfur-containing compound to produce environmentally-acceptable, chemically reduced products. The method is useful for treating contaminants such as halogenated hydrocarbons, pesticides, chemical warfare agents and dyes. The remediating composition preferably contains comminuted, commercial grade iron and iron sulfide. The addition of an alcohol to the reactants enhances the rate of the remediation reaction, particularly for contaminants of soils and sediments.

Claims

1. A method for the remediation of an environmental contaminant comprising reacting the contaminant with an alcohol, wherein the alcohol solubilizes the contaminants, and a reaction mixture comprising elemental iron and a sulfide-containing compound for a sufficient amount of time to cause chemical reduction of the contaminant, wherein the amount of the sulfide-containing compound is between 0.1% and 25% by weight of the mixture, and wherein the environmental contaminant is an organic compound.

2. The method of claim 1 wherein the iron is comminuted.

3. The method of claim 1 wherein the sulfide is a transition metal sulfide.

4. The method of claim 1 wherein the sulfide is selected from the group consisting of iron sulfide and sodium hydrogen sulfide.

5. The method of claim 1 wherein the sulfide-containing compound is iron sulfide.

6. The method of claim 1 wherein the iron is commercial grade iron.

7. The method of claim 1 wherein the contaminant is contaminating an environmental material selected from the group consisting of soil, sediment, aquifer material, water, and a container in which the contaminant was contained.

8. The method of claim 1 wherein the contaminant is selected from the group consisting of halogenated hydrocarbon compounds, halogenated hydrocarbon solvents, pesticides, chemical warfare agents and dyes.

9. The method of claim 1 wherein the contaminant is a soil or sediment contaminant.