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Nanoscale zero-valent iron-assisted soil washing for the removal of potentially toxic elements

Abstract: The present study focuses on soil washing enhancement via soil pretreatment with nanoscale zero-valent iron (nZVI) for the remediation of potentially toxic elements. To this end, soil polluted with As, Cu, Hg, Pb and Sb was partitioned into various grain sizes (500?2000, 125?500 and <125??m). The fractions were pretreated with nZVI and subsequently subjected, according to grain size, to Wet-High Intensity Magnetic Separation (WHIMS) or hydrocycloning. The results were compared with those obtained in the absence of nanoparticles. An exhaustive characterization of the magnetic signal of the nanoparticles was done. This provided valuable information regarding potentially toxic elements (PTEs) fate, and allowed a metallurgical accounting correction considering the dilution effects caused by nanoparticle addition. As a result, remarkable recovery yields were obtained for Cu, Pb and Sb, which concentrated with the nZVI in the magnetically separated fraction (WHIMS tests) and underflow (hydrocyclone tests). In contrast, Hg, concentrated in the non-magnetic fraction and overflow respectively, while the behavior of As was unaltered by the nZVI pretreatment. All things considered, the addition of nZVI enhanced the efficiency of soil washing, particularly for larger fractions (125?2000??m). The proposed methodology lays the foundations for nanoparticle utilization in soil washing operations.

 Fuente: Journal of Hazardous Materials 350 (2018) 55-65

Editorial: Elsevier

 Fecha de publicación: 15/05/2018

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jhazmat.2018.02.016

ISSN: 0304-3894,1873-3336

Proyecto español: CTM2016-75894-P

Url de la publicación: https://doi.org/10.1016/j.jhazmat.2018.02.016

Autores/as

BOENTE LÓPEZ, CARLOS

CARLOS SIERRA FERNANDEZ

MARTÍNEZ BLANCO, DAVID

MENÉNDEZ AGUADO, JUAN MARÍA

RODRÍGUEZ GALLEGO, JOSÉ LUIS