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Cyanide Leaching from Soil Developed from Coking Plant Purifier Waste as Influenced by Citrate

^a Soil Science and Soil Ecology Group, Faculty of Geosciences, Ruhr-University Bochum, D-44780 Bochum, Germany
^b Inst. of Terrestrial Ecology, Swiss Federal Inst. of Technology, Grabenstrasse 3, CH-8952 Schlieren, Switzerland

View larger version (22K): [in a new window]   Fig. 1. Powder X-ray diffraction pattern of the soil developed from purifier waste near a former coal coking plant. Major peaks are labeled with the d-spacing (in nm) and corresponding mineral phases: PB = Prussian blue, GY = gypsum, JR = jarosite, S = elemental sulfur, and H = hematite.

View larger version (25K): [in a new window]   Fig. 2. Transmission FT-IR spectra (KBr pellets) of the cyanide contaminated soil developed from coking plant purifier waste. Spectra of Prussian blue, gypsum, lignin, and cellulose are shown for comparison.

View larger version (20K): [in a new window]   Fig. 3. Total and dissolved CN, SO4, Ca, pH, and pe in the effluent from packed soil columns leached with a 1 mM CaCl2 solution (pH 6) at a constant flow rate of 0.3 and 1.0 mL min–1, respectively.

View larger version (21K): [in a new window]   Fig. 4. Total and dissolved CN, SO4, Ca, pH, and pe in the effluent from a soil column leached with a sequence of influent solutions: (i) 100 mM CaCl2 solution at 1 mL min–1, (ii) 0.1 mM CaCl2 solution at 0.2 mL min–1, and (iii) 0.1 mM CaCl2 solution containing 1 mM citric acid at 0.2 mL min–1. After 161 pore volumes, the flow was interrupted for 24 h and then resumed using the same influent and flow rate.

View larger version (20K): [in a new window]   Fig. 5. Total and dissolved CN, SO4, Ca, pH, and pe in the effluent from a soil column leached with a sequence of influent solutions: (i) 100 mM CaCl2 solution at 1 mL min–1, (ii) 0.1 mM CaCl2 solution at 0.2 mL min–1, and (iii) 0.1 mM CaCl2 solution containing 10 mM citric acid at 0.2 mL min–1. After 187 and 236 pore volumes, the flow was interrupted for 24 h and then resumed using the same influent and flow rate.

View larger version (23K): [in a new window]   Fig. 6. Total and dissolved CN, SO4, Ca, pH, and pe in the effluent from a soil column leached with a sequence of influent solutions: (i) 100 mM CaCl2 solution at 1 mL min–1, (ii) 0.1 mM CaCl2 solution at 0.2 mL min–1, and (iii) 0.1 mM CaCl2 solution containing 100 mM citric acid at 0.2 mL min–1. After 182, 236, and 255 pore volumes, the flow was interrupted for 24 h and then resumed using the same influent and flow rate.