Method for recycle and use of contaminated soil and sludge.

摘要

Process for recycle and reuse of water contaminated with toxic metals, process for recycle and reuse of soil, sludge, sand and rock contaminated with toxic metals and/or organic contaminants in the manufacture of cement, and a cement composition produced according to the process of mixing (a) water contaminated with at least about 5 mg/l arsenic, about 100 mg/l barium, about 1 mg/l cadmium, about 5 mg/l chromium, about 5 mg/l lead, about 0.2 mg/l mercury, about 1 mg/l selenium, or about 5 mg/l silver, or (b) a quantity of contaminated earthen mineral matter comprising at least about 16 wt% calcium oxide, about 5 wt.% silica, about 1 wt.% alumina, about 0.5 wt.% Fe2O3 or about 0.76 wt.% magnesia, the earthen mineral matter containing at least about 5 ppm arsenic, about 100 ppm barium, about 1 ppm cadmium, about 5 ppm chromium, about 5 ppm lead, about 0.2 ppm mercury, about 1 ppm selenium, or about 5 ppm silver, with an amount of inorganic constituents and water to form an aqueous raw material slurry having a chemical composition suitable for the manufacture of Portland cement, charging the slurry to a cement kiln, heating the slurry in the kiln to a temperature sufficient to form cement clinker, and removing the cement clinker from the rotary kiln. If the earthen mineral matter contains (a) in excess of 1 part per billion of 2,3,7,8 TCDD or (b) a combined total concentration of at least about 2.16 parts per million of one or more organic compounds selected from the group consisting of tetrachloroethylene, trichloroethylene, methylene chloride, 1,1,1-trichloroethane, carbon tetrachloride, chlorinated fluorocarbons, chlorobenzene, 1,1,2-trichloro-1,2,2 trifluoroethane, ortho-dichlorobenzene, trichlorofluoromethane, 1,1,2-trichloroethane, xylene, acetone, ethyl acetate, ethyl benzene, ethyl ether, methyl isobutyl ketone, n-butyl alcohol, cylcohexanone, methanol, cresols, cresylic acid, nitrobenzene, toluene, methyl ethyl ketone, carbon disulfide, isobtanol, pyridine, benzene, 2-ethoxyethanol, 2-nitropropane, 2,4,5-trichlorophenol, tetrachlorophenol, pentachlorophenol, tetrachlorobenze, pentachlorobenzene, hexachlorobenzene, and polychlorinated biphenyls, the method further comprises vaporizing said 2,3,7,8 TCDD and/or said organic compounds from the earthen mineral matter prior to the mixing step, recovering said vaporized 2,3,7,8 TCDD and/or said organic compounds, and burning said recovered materials in the cement kiln during the cement forming process.