Soil decontamination using ferric chelates and peroxide

Details Soil decontamination using ferric chelates and peroxide Soil decontamination using ferric chelates and peroxide

1993-09-08

2000-12-12

Bos, Steven

Hazardous or toxic waste destruction or containment

Containment

Solidification, vitrification, or cementation

588206, 588207, 210759, 210908, 210909, A62D 300, C02F 172

Patent

active

061601942

ABSTRACT:
Soluble ferric chelates and peroxide are employed in a method for degrading organic contaminants such as pesticides in soil. In the practice of the method, soil containing an organic compound having at least one oxidizable aliphatic or aromatic functional group is contacted with an active ferric chelate and a peroxide such as hydrogen peroxide in amounts effective to achieve degradation of the compound in the presence of water at the pH of the soil. In preferred embodiments, at least about 3%, and in some cases at least about 5% or 10%, of the ferric chelate does not sorb to the soil. Example ferric chelates include ferric nitrilotriacetate, ferric hydroxyethyleniminodiacetate, ferric gallate, and mixtures thereof; ferric nitrilotriacetate and ferric hydroxyethyleniminodiacetate are especially preferred in some embodiments.

REFERENCES:
patent: 5043000 (1991-08-01), Cater et al.
patent: 5232484 (1993-08-01), Pignatello
Leung, S.W., J. Environ. Qual. 21: 377-381 (1992).
Masten, S.J., Ozone Sci. Engineer. 13: 287-312 (1991).
Pardieck, D.L., et al., J. Contam. Hydrol. 9: 221-242 (1992).
Sun, Y. and Pignatello, J.J., J. Agr. Food Chem. 40: 322-327 (1992).
Tyre, B.W., et al, J. Environ. Qual. 20: 832-838 (1991).
Joseph J. Pignatello et al., "Ferric Compounds as Catalysts for `Fenton` Degradation of 2,4-D and Metolachlor in Soil", Journal of Environmental Quality, vol. 23, No. 2, Mar.-Apr. 1994, pp. 365-70.

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