Andrés Navarro Flores, Francisco Martínez Sola
Dep. M. Fluidos, ETSEIAT, Universidad Politécnica de Cataluña (UPC), Colón 7, 08222 Terrassa, Spain.
Bioresour Technol. 2008 Nov;99(16):7521-30. doi: 10.1016/j.biortech.2008.02.022. Epub 2008 Mar 26.
Column experiments were conducted to investigate the removal of heavy metals from two mine tailings (El Arteal and Jaravías) using sewage sludge as a reactive material. When sewage sludge is used as a reactive material on the El Arteal tailings (sample SA), Fe, Mn, Zn and Pb are removed and Cu and Ni are mobilized. The experiments carried out on the Jaravías tailings give similar results, showing the retention of Cu, Pb, Fe and Mn and the mobilization of Ni and Zn. An analysis performed using the PHREEQC numerical code suggests that the retention of Fe in the sewage sludge may be caused by the precipitation of Fe(OH)2.7Cl0.3 and possibly pyrite, and that the retention of Pb at high pH may be caused by the formation of stable phase minerals such as Pb(OH)2 and PbS in these conditions. Ni mobilization in the column experiments with the two tailings samples may be caused by the presence of significant amounts of leachable Ni in the sewage sludge. The complexation of metals with dissolved organic matter, calculated with the Minteq model, may be moderate.
进行了柱实验，以研究使用污水污泥作为反应材料从两种尾矿（埃尔阿尔泰尔尾矿和哈拉维亚斯尾矿）中去除重金属的情况。当污水污泥用作埃尔阿尔泰尔尾矿（样品SA）的反应材料时，铁、锰、锌和铅被去除，而铜和镍被活化。在哈拉维亚斯尾矿上进行的实验给出了类似的结果，表明铜、铅、铁和锰被保留，而镍和锌被活化。使用PHREEQC数值代码进行的分析表明，污水污泥中铁的保留可能是由Fe(OH)2.7Cl0.3以及可能的黄铁矿沉淀引起的，并且在高pH值下铅的保留可能是由在这些条件下形成稳定相矿物如Pb(OH)2和PbS引起的。在使用这两种尾矿样品进行的柱实验中镍的活化可能是由于污水污泥中存在大量可浸出的镍。用Minteq模型计算得出，金属与溶解有机物的络合作用可能适中。
