Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
J Contam Hydrol. 2011 Jul 1;125(1-4):26-38. doi: 10.1016/j.jconhyd.2011.04.004. Epub 2011 Apr 27.
A laboratory-scale column experiment was conducted to evaluate the effect of organic carbon amendments on the mobility of As, Cu, Fe, Mn, Mo, Ni, Pb, Sb, Tl and Zn in mine tailings. Three columns were packed with sulfide- and carbonate-rich tailings, which were amended with a 1:1 (vol.) mixture of peat and spent brewing grain at proportions of 0, 2 and 5vol.%. A simulated input solution characterized by circumneutral pH and elevated concentrations of SO(4) and S(2)O(3) was passed through the columns for 540 days. The input solution contained low concentrations of metal(loid)s during the initial 300 days and elevated concentrations thereafter. Decreases in mass transport of S(2)O(3) were observed in all columns; with increased attenuation observed at 5 vol. % organic carbon content. Removal of Mn, Ni, Cu, Sb and Mo was observed in all columns during the initial 300 days. However, during this time, mobilization of Fe, As, Zn and Pb was observed, with the greatest increases in concentration observed at the higher organic carbon content. During the final 240 days, S(2)O(3) removal was enhanced in columns containing organic carbon, and Fe, Mn, Ni, Tl, As and Sb removal also was observed. This study demonstrates the influence of organic carbon amendments on metal(loid) mobility in mine tailings. Decreases in mass discharge of metal(loid)s may be achieved using this technique; however, site-specific geochemical conditions must be considered before field-scale implementation.
采用实验室规模的柱状实验，评估有机碳改良剂对尾矿中砷、铜、铁、锰、钼、镍、铅、锑、铊和锌的迁移性的影响。三个柱状体填充富含硫化物和碳酸盐的尾矿，用比例为 0、2 和 5vol.%的泥炭和废酿造谷物 1:1（体积比）混合物进行改良。用模拟输入溶液通过柱状体，溶液特征为近中性 pH 值和高浓度 SO(4) 和 S(2)O(3)，持续 540 天。输入溶液在最初 300 天含有低浓度金属（类），此后浓度升高。在所有柱状体中均观察到 S(2)O(3)的质量迁移减少；在 5 vol.%有机碳含量时观察到增强的衰减。在最初 300 天的所有柱状体中均观察到 Mn、Ni、Cu、Sb 和 Mo 的去除。然而，在此期间，观察到 Fe、As、Zn 和 Pb 的迁移，在较高有机碳含量时观察到浓度的最大增加。在最后 240 天，含有有机碳的柱状体中 S(2)O(3)的去除得到增强，并且还观察到 Fe、Mn、Ni、Tl、As 和 Sb 的去除。本研究证明了有机碳改良剂对尾矿中金属（类）迁移性的影响。可以使用该技术减少金属（类）的质量排放量；然而，在进行现场规模实施之前，必须考虑特定地点的地球化学条件。
