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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >Removal of Metal Ions From Acid Mine Drainage by Immobilized Algal Biomass
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Removal of Metal Ions From Acid Mine Drainage by Immobilized Algal Biomass

机译：固定化藻类生物质去除酸性矿井中的金属离子

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摘要

One of the major water pollution problems in southern New Mexico is the formation of acid mine drainage from abandoned and existing mine tailings. This research work used non-viable (immobilized) Cyanidium caldarium biomass to remediate acid mine drainage. Unmodified and chemically modified C. caldarium were immobilized in a sodium silicate matrix to increase the strength and the particle size of the biomaterial. These biomaterials were examined with respect to metal binding of two toxic metal ions present in acid mine drainage from Tyrone, NM, aluminum (Ⅲ) and copper (Ⅱ). The biomaterials were found to bind both metal ions from dilute metal-bearing solutions in a pH-dependent manner. The pH-dependent trend was comparable to results presented in the literature. Both aluminum and copper binding characteristics were enhanced by the chemical modification with sulfuric acid at room temperature (RT biomaterial). Optimal sorption occurred at pH 5.0 and 6.0, however; significant sorption was also obtained for pH 2.0, 3.0, and 4.0 for aluminum and 1.0, 2.0, 3.0 and 4.0 for copper. After the screening of the RT biomaterial with single-element solutions, the RT biomaterial was contacted with acid mine drainage, which contained 889 ppm copper and 66 ppm aluminum at pH 5.0. The RT biomaterial was able to remove significant amounts of copper (90 ppm) and aluminum (3.6 ppm) using 20 mg/mL RT biomaterial. The acid mine drainage also contained mg levels of cobalt, chloride, magnesium, manganese, titanium, uranium, yttrium, and zinc. The mass of RT biomaterial needed to completely remove both copper and aluminum at this time is not practical. Immobilized C. caldarium (RT biomaterial) can remove copper and aluminum by biosorption from dilute solutions, and thus could be a feasible alternative polishing step material.
机译：新墨西哥州南部的主要水污染问题之一是废弃和现有矿山尾矿形成酸性矿山排水。这项研究工作使用不可行的（固定化的）氰化镉cal生物质来补救酸性矿山的排水问题。将未改性和化学改性的梭状芽孢杆菌固定在硅酸钠基质中，以增加生物材料的强度和粒径。对这些生物材料进行了金属结合，分析了酸性矿山中从泰隆，NM，铝（Ⅲ）和铜（Ⅱ）中排出的两种有毒金属离子的金属结合。发现生物材料以pH依赖的方式结合稀金属溶液中的两种金属离子。 pH依赖性趋势与文献中提供的结果相当。铝和铜的结合特性均通过在室温下用硫酸进行化学修饰而得以增强（RT生物材料）。然而，最佳的吸附发生在pH 5.0和6.0。对于铝的pH 2.0、3.0和4.0，对于铜为1.0、2.0、3.0和4.0，也获得了明显的吸附。用单元素溶液筛选RT生物材料后，使RT生物材料与酸性矿井排水接触，该酸性矿井排水的pH 5.0为889 ppm的铜和66 ppm的铝。使用20 mg / mL的RT生物材料，RT生物材料能够去除大量的铜（90 ppm）和铝（3.6 ppm）。酸性矿山排水中还含有钴，氯化物，镁，锰，钛，铀，钇和锌。此时完全去除铜和铝所需的大量RT生物材料不切实际。固定化的梭菌（RT生物材料）可以通过生物吸附从稀溶液中去除铜和铝，因此可能是可行的替代抛光步骤材料。

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