Somerville R, Norrström A C
Department of Land and Water Resources Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
Water Sci Technol. 2009;60(4):935-42. doi: 10.2166/wst.2009.415.
Since the operational costs of commonly used materials for adsorption of toxic metals can be substantial, natural material may be of great interest for treatment applications. Two types of natural material that have shown particular promise are seaweed and seafood waste. In this study, adsorption capacity of Brown seaweed and shrimp shells were compared with a strong acid cation exchange resin (CER). A case study site was used as a reference point and column experiments were designed in a similar manner although at different scale. Each media reduced concentrations of the target metals to levels below defined reference values. If the alternative adsorption media perform as well in the field as the laboratory, the results suggest that the media tested would completely remove the toxic metals in groundwater and runoff water. Seaweed and shrimp shells had stronger affinities for Pb and Cu than CER. However, CER was superior in affinity for Zn, the most weakly bound metal. Moreover, the results showed that Ca in the solution reduced the adsorption capacity of the other metals. This illustrates the limitations of applying the behaviour of the batch studies with single metal solutions to a multi-component system with competitive adsorption.
由于用于吸附有毒金属的常用材料的运营成本可能很高，天然材料可能在处理应用中具有很大的吸引力。两种显示出特别前景的天然材料是海藻和海鲜废料。在本研究中，将褐藻和虾壳的吸附能力与强酸性阳离子交换树脂（CER）进行了比较。以一个案例研究地点作为参考点，并以类似方式设计了柱实验，尽管规模不同。每种介质都将目标金属的浓度降低到定义的参考值以下。如果替代吸附介质在现场的表现与实验室中一样好，结果表明所测试的介质将完全去除地下水和径流水中的有毒金属。海藻和虾壳对铅和铜的亲和力比CER更强。然而，CER对锌（结合最弱的金属）的亲和力更高。此外，结果表明溶液中的钙降低了其他金属的吸附能力。这说明了将单金属溶液的批次研究行为应用于具有竞争性吸附的多组分系统的局限性。
