WRRCTR No.159 Decontamination of Chromium-Contaminated Soil in Hawai'i

Dugan, Gordon L.
Gee, Henry K.
Lau, L. Stephen
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Water Resources Research Center, University of Hawaii at Manoa
Approximately 1 841 m3 (65,000 ft^3) of chromium-contaminated soil, classified as hazardous waste (>5 mg/l chromium extract concentration as measured by the EP toxicity test) was found near the new pipe shop at the Pearl Harbor Naval Shipyard on Oahu, Hawaii. Unless treated to a safe level, the contaminated soil required disposal in a Class 1 landfill, the closest being in the continental United States. Based on simple laboratory and pilot plant procedures, the project proved that chromium could be effectively leached from the soil to a safe level by using a nearly 1:4 weighted soil to water ratio; reducing the pH to 2.5; adding sodium metabisulfite to chemically reduce chromium from Cr+6 to Cr+3 ; and then raising the pH to 8.5 to precipitate the chromium from solution. A full-scale operation, following the technology that was developed, successfully treated the soil to a safe level and subsequent testing of the treated soil at the disposal (landfill) site confirmed the effectiveness of the treatment operation.
chromium, soil contamination, soil treatment, chemical precipitation, hazardous waste, Pearl Harbor Naval Shipyard, Oahu, Hawaii
Dugan GL, Gee HK, Lau LS. 1984. Decontamination of chromium-contaminated soil in Hawai'i. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 159.
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