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Use of iron minerals in optimizing the peroxide treatment of contaminated soils

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Abstract:

ABSTRACT:

The treatment of silica sand contaminated with pentachlorophenol (PCP) using the standard Fenton's reagent procedure, sequential addition of iron (II) and H2O2, and a goethite (α-FeOOH)-H2O2 system was investigated. The standard Fenton's procedure oxidized 10 mg/L soluble PCP, but was ineffective in degrading 10 mg/kg or 250 mg/kg particulate and sorbed PCP in silica sand. Sequential addition of excess reagents (480 mg/L iron (II) and 7% H2O2) degraded particulate and sorbed PCP, but with high stoichiometric H2O2 requirements. The most efficient system for PCP degradation was the H2O2-goethite system. Although the experimental system used in this research lacks the complexity of natural soils, the data suggest that under proper conditions, the iron oxyhydroxide fractions of the soil matrix catalyze Fenton-like reactions, and that these mineral-catalyzed reactions may be the most efficient mechanism for the catalyzed hydrogen peroxide treatment of contaminated soils.

Keywords: Fenton's reagent; hydrogen peroxide; minerals; oxidation; pentachlorophenol; remediation

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/WER.65.7.5

Publication date: November 1, 1993

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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