Remediation of soil contaminated with organic compounds

• US 5,855,797 A
• Filed: 08/25/1997
• Issued: 01/05/1999
• Est. Priority Date: 01/24/1997
• Status: Expired due to Fees

• Current Assignee: Hsing Kuang Lin, Huan V. Luong
• Original Assignee: Hsing Kuang Lin, Huan V. Luong
• Inventors: Luong, Huan V., Lin, Hsing Kuang
• Primary Examiner(s): Upton, Christopher
• Application Number:
  US08/918,095
• Time in Patent Office: 498 Days
• Field of Search: 210/747, 210/758, 210/759, 210/909
• US Class Current: 405/128.5
• CPC Class Codes: A62D 2101/22 containing halogen
• CPC Class Codes: A62D 3/38 by oxidation; by combustion
• CPC Class Codes: B09C 1/08 chemically
• CPC Class Codes: C02F 1/722 Oxidation by peroxides
• CPC Class Codes: Y10S 210/909 Aromatic compound, e.g. pcb, phenol

Abstract

A method of remediating water or soil contaminated with contaminants including one or more halogenated, phenyl related biphenyl related, triazine related, and petroleum related compounds includes reacting the contaminated water or soil with an oxidant, and one or more metals in elemental or alloy form until essentially all of the contaminants has been decomposed and the water or soil is essentially free of the contaminants.

Claims

1. A method of removing contaminant material including phenol related compounds from soil contaminated therewith, the method comprising the steps of:

(a) mixing the contaminated soil with reagents including, a metal in metallic form selected from the group of metals consisting of iron, aluminum, manganese and magnesium, and a first, acidic aqueous solution including an oxidant, thereby forming a first slurry, said metal being present in said aqueous solution in a molar ratio greater than about 0.1 with said oxidant;

(b) periodically agitating the first slurry until essentially all of the contaminant material in the soil has been decomposed, thereby forming a second slurry, said second slurry including soil which is essentially free of the contaminant material, and a second aqueous solution; and

(c) separating the essentially contaminant-material-free soil from the second aqueous solution.

2. The method of claim 1 wherein the phenol related compounds at least one of pentachlorophenol (PCP) or poly chlorinated biphenyls (PCBs).

3. The method of claim 1 wherein said metal is present in said aqueous solution in a molar ratio greater than about 1.0 and with said oxidant.

4. The method of claim 1 wherein said oxidant is hydrogen peroxide.

5. The method of claim 1 wherein said metal includes at least iron.

6. The method of claim 1 wherein said acidic solution is made acidic by addition of an acid thereto.

7. The method of claim 1 wherein said molar ratio of metal is selected in direct relationship to an anticipated level of the contaminant material in the contaminated soil.