Arsenic remediation through magnetite based in situ immobilization

Jing Sun, B. C. Bostick, S. N. Chillrud, B. J. Mailloux, H. Prommer

Research output: Chapter in Book/Conference paperConference paper

Abstract

The remediation of arsenic-contaminated aquifers is a formidable challenge to achieve, in part because geochemical conditions often do not favor the stabilization of arsenic within the solid phase. A promising remedial approach involves stimulating iron mineral transformations that immobilize arsenic through sorption or precipitation. Despite intense research, the current immobilization methods are still often ineffective, in part because many iron minerals are susceptible to redox gradients common in subsurface environments. We have been conducting a series of studies to illustrate the potential of nanoparticulate magnetite (Fe3 O4) to sequester arsenic. Magnetite is stable under most redox conditions in aquifers, and able to co-precipitate and adsorb arsenic. Here, we present results from microcosm and column experiments using sediments and groundwater from U.S. Superfund sites, and from reactive transport modelling. All these results demonstrate that in situ formation of nanoparticulate magnetite can be achieved by the combination of nitrate and ferrous iron, and that it should be feasible to produce an in situ reactive filter by such nitrate-iron(II) co-injection and immobilize arsenic in contaminated aquifers.

Original languageEnglish
Title of host publicationEnvironmental Arsenic in a Changing World
Subtitle of host publication7th International Congress and Exhibition on Arsenic in the Environment, As 2018
EditorsYong-Guan Zhu, Huaming Guo, Prosun Bhattacharya, Arslan Ahmad, Jochen Bundschuh, Ravi Naidu
Place of PublicationUSA
PublisherCRC Press
Pages474-475
Number of pages2
ISBN (Print)9781138486096
DOIs
Publication statusPublished - 2018
Event7th International Congress and Exhibition on Arsenic in the Environment, As 2018 - Beijing, China
Duration: 1 Jul 20186 Jul 2018

Publication series

NameArsenic in the Environment - Proceedings
ISSN (Print)2154-6568

Conference

Conference7th International Congress and Exhibition on Arsenic in the Environment, As 2018
CountryChina
CityBeijing
Period1/07/186/07/18

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  • Cite this

    Sun, J., Bostick, B. C., Chillrud, S. N., Mailloux, B. J., & Prommer, H. (2018). Arsenic remediation through magnetite based in situ immobilization. In Y-G. Zhu, H. Guo, P. Bhattacharya, A. Ahmad, J. Bundschuh, & R. Naidu (Eds.), Environmental Arsenic in a Changing World: 7th International Congress and Exhibition on Arsenic in the Environment, As 2018 (pp. 474-475). (Arsenic in the Environment - Proceedings). CRC Press. https://doi.org/10.1201/9781351046633-187