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Mine Water and the Environment

, Volume 36, Issue 2, pp 209–216 | Cite as

Dominant Mechanisms for Metal Removal from Acidic Aqueous Solutions by Cement Kiln Dust

  • Abbas H. Sulaymon
  • Ayad A. H. Faisal
  • Qusey M. Khaliefa
Technical Article

Abstract

Copper and zinc ions were removed from synthetic acidic aqueous solutions onto cement kiln dust (CKD) particles in a single component system. The objectives of this study were to: distinguish between adsorption and precipitation when both mechanisms are occurring simultaneously; define their individual contributions; and consequently, specify the dominant mechanism. This was achieved by conducting a new experimental procedure for the precipitation phase that depended on CKD leachate in combination with a derivation of a simultaneous adsorption-precipitation equation. High removal efficiencies, approaching 100 %, of the Cu and Zn ions, were attained. Precipitation was the dominant mechanism for removing low concentrations of these metals, while adsorption appears to be more significant in removal of high metal concentrations.

Keywords

Precipitation Adsorption Water contamination Isotherm 

Zusammenfassung

Aus synthetischen sauren wässrigen Lösungen wurden Kupfer- und Zinkionen an Zementstaubpartikeln (CKD)in einem Einkomponentensystem entfernt. Die Ziele der Studie waren, zwischen der Adsorption und der Ausfällung bei einem gleichzeitigem Auftreten beider Mechanismen zu unterscheiden, deren individuelle Wirkung zu bestimmen und somit den dominierenden Mechanismus abzugrenzen. Dazu wurde ein neues experimentelles Verfahren für die Ausfällungsphase durchgeführt. Die Auswertung der Versuche stützt sich auf die Herleitung einer simultanen Adsorptions-Fällungs-Gleichung. Für Cu- und Zn-Ionen wurden hohe Ausscheidungsgrade von nahe 100 % erreicht. Bei niedrigen Konzentrationen war die Ausfällung der dominierende Mechanismus für die Entfernung dieser Metalle. Die Adsorption erscheint bei hohen Metallkonzentrationen signifikanter.

Resumen

Se removieron cobre y cinc desde soluciones acuosas ácidas sobre partículas de polvo de horno de cemento (CKD) en un sistema de un único componente. Los objetivos de este estudio fueron: distinguir entre adsorción y precipitación cuando ambos mecanismos están ocurriendo simultáneamente; definir sus contribuciones individuales y, consecuentemente, especificar el mecanismo dominante. Esto se logró mediante un nuevo procedimiento experimental para la fase de precipitación que dependió del lixiviado CKD en combinación con una derivación de una ecuación de adsorción-precipitación simultánea. Se obtuvieron altas eficiencias de remoción de Cu y Zn, aproximadamente de 100 %. La precipitación fue el mecanismo dominante para la remoción de bajas concentraciones de estos metales mientras que la adsorción aparece como más significativa en la remoción de altas concentraciones de metales.

水泥窑粉尘去除酸性废水金属离子机理

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Abbas H. Sulaymon
    • 1
  • Ayad A. H. Faisal
    • 1
  • Qusey M. Khaliefa
    • 2
  1. 1.Department of Environmental EngineeringCollege of Engineering, University of BaghdadBaghdadIraq
  2. 2.Department of Civil Engineering, Faculty of EngineeringUniversity of KufaAn NajafIraq

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