Abstract
Soluble forms of Si and Si-rich substances may reduce both metal mobility and toxicity. A series of column experiments were performed to investigate the influence of Si-rich materials on the mobility and leaching potential of certain metals. Column experiments were conducted using sandy soil that had been treated with various forms of a Si-rich substance, i.e. diatomaceous earth, zeolite, amorphous silicon dioxide, and concentrated monosilicic acid. The soil was also treated with soluble forms of Cd, Cu, Ni, and Pb to simulate a contaminated mine site. Application of the Si-rich materials resulted in metal immobilization and reduced leaching. It appears that monosilicic acid can cause both physical adsorption and metal precipitation within contaminated soils. Further investigations are recommended to assess the potential use of this approach for remediation of mine tailings and decontamination mine sites.
Zusammenfassung
Lösliche Formen von Si und Si-reichen Substanzen können sowohl die Mobilität von Metallen als auch deren Toxizität verringern. Es wurde eine Reihe von Säulenversuchen durchgeführt, um den Einfluss von Si-reichen Materialien auf die Mobilität und das Freisetzungspotential von verschiedenen Metallen zu untersuchen. Die Säulenversuche wurden unter Verwendung von sandigen Böden, die mit verschiedenen Si-reichen Substanzen, z. B. Diatomeenerde, Zeolithe, amorphes Siliziumdioxid und konzentrierte Monokieselsäure behandelt wurden, durchgeführt. Der Boden wurde darüber hinaus mit gelöstem Cd, Cu, Ni und Pb behandelt, um die Bedingungen eines Bergbaustandorts nachzubilden. Die Verwendung von Si-reichen Materialien führte zu einer Immobilisierung und einer verringerten Freisetzung der Metalle. Es hat sich gezeigt, dass Monokieselsäure sowohl die physikalische Adsorption als auch die Ausfällung von Metallen begünstigt. Weitere Untersuchungen werden empfohlen, um die Übertragbarkeit dieses Ansatzes zur Behandlung von Bergbauhalden und –standorten zu bewerten.
Resumen
Las formas solubles de Si y las sustancias ricas en Si pueden reducir la movilidad y la toxicidad de los metales. Una serie de ensayos en columna fueron realizados para investigar la influencia de materiales ricos en Si sobre la movilidad y el potencial de lixiviación de ciertos metales. Los experimentos en columnas fueron realizados usando suelos arenosos que habían sido tratado con varias formas de una sustancia rica en Si: tierra diatomea, zeolita, dióxido de silicio amorfo y ácido monosilícico concentrado. El suelo fue también tratado con formas soluble de Cd, Cu, Ni y Pb para simular un sitio de mina contaminado. La aplicación de materiales ricos en Si resultó en la inmovilización metálica y la reducción de la lixiviación. Esto indica que el ácido monosilícico puede ser usado tanto para la adsorción física como para la precipitación de metales en suelos contaminados. Futuras investigaciones son necesarias para conocer el potencial uso de esta aproximación para la remediación de colas y la decontaminación de sitios mineros.
摘要
可溶态硅和富硅材料可降低金属离子活性及其毒性。为研究富硅材料对金属活性和可滤出潜力的影响进行了系列淋溶柱实验。实验用沙质土样已为多种形式的富硅材料如硅藻土、沸石、非晶态二氧化硅以及浓偏硅酸等处理。同时,土样亦进行可溶态Cd、Cu、Ni和Pb处理,以模拟土样受污染状态。富硅材料的应用使金属离子活性降低、可滤出潜力减弱。偏硅酸能够在污染土样内发生物理吸附和金属离子沉淀两种作用。值得进一步研究该方法在尾矿修复与污染消除方面的应用前景。
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The study was supported by the International S&T Cooperation Program of China (ISTCP) special project (2015DFR91000).
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Supplemental Fig. 1.
SEM microphotographs of the diatomaceous earth (PDF 928 kb)
Supplemental Fig. 2.
SEM microphotographs of the zeolite (PDF 806 kb)
Supplemental Fig. 3.
SEM microphotographs of the amorphous silicon dioxide (PDF 1184 kb)
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Matichenkov, V.V., Bocharnikova, E.A., Pahnenko, E.P. et al. Reduction of Cd, Cu, Ni, and Pb Mobility by Active Si in a Laboratory Study. Mine Water Environ 35, 302–309 (2016). https://doi.org/10.1007/s10230-015-0353-5
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DOI: https://doi.org/10.1007/s10230-015-0353-5