Effects of clay minerals, hydroxides, and timing of dissolved organic matter addition on the competitive sorption of copper, nickel, and zinc: A column experiment

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:187

Article

Refaey, Yasser^1,2  Jansen, Boris¹  Parsons, John R.¹  de Voogt, Pim¹  Bagnis, Simone^1,3  Markus, Adriaan^1,4  El-Shater, Abdel-Hamid²  El-Haddad, Abdel-Aziz²  Kalbitz, Karsten^1,5 

[1] Univ Amsterdam, IBED, POB 94240, NL-1090 GE Amsterdam, Netherlands

[2] Sohag Univ, Dept Geol, Fac Sci, POB 82524, Sohag, Egypt

[3] Univ Plymouth, Biogeochem Res Ctr, Portland Sq, Plymouth PL4 8AA, Devon, England

[4] Deltares, POB 177, NL-2600 MH Delft, Netherlands

[5] Tech Univ Dresden, Inst Soil Sci & Site Ecol, Fac Environm Sci, Soil Resources & Land Use, Pienner Str 19, D-01737 Tharandt, Germany

关键词: Heavy metals;    Adsorption kinetics;    Dissolved organic matter;    Wastewater;    Remediation;   

DOI  :  10.1016/j.jenvman.2016.11.056

来源: Elsevier

【 摘 要 】

Infiltration of heavy metal (HM) polluted wastewater can seriously compromise soil and groundwater quality. Interactions between mineral soil components (e.g. clay minerals) and dissolved organic matter (DOM) play a crucial role in determining HM mobility in soils. In this study, the influence of the timing of addition of DOM, i.e. concurrent with or prior to HMs, on HM mobility was explored in a set of continuous flow column experiments using well defined natural soil samples amended with goethite, birnessite and/or smectite. The soils were subjected to concurrent and sequential additions of solutions of DOM, and Cu, Ni and Zn. The resulting breakthrough curves were fitted with a modified dose-response model to obtain the adsorption capacity (q(0)). Addition of DOM prior to HMs moderately enhanced q(0) of Cu (8-25%) compared to a control without DOM, except for the goethite amended soil that exhibited a 10% reduction due to the blocking of binding sites. Meanwhile, for both Zn and Ni sequential addition of DOM reduced q(0) by 1-36% for all tested soils due to preferential binding of Zn and Ni to mineral phases. In contrast, concurrent addition of DOM and HMs resulted in a strong increase of q(0) for all tested metals and all tested soil compositions compared to the control: 141-299% for Cu, 29-102% for Zn and 32-144% for Ni. Our study shows that when assessing the impact of soil pollution through HM containing wastewater it is crucial to take into account the presence of DOM. (C) 2016 Elsevier B.V. All rights reserved.

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