In situ arsenic immobilisation for coastal aquifers using stimulated iron cycling: Lab-based viability assessment

Barron，Alyssa1,2; Sun，Jing1,2,3; Passaretti，Stefania4; Sbarbati，Chiara4; Barbieri，Maurizio4; Colombani，Nicolò5; Jamieson，James1,2; Bostick，Benjamin C.6; Zheng，Yan7; Mastrocicco，Micòl8; Petitta，Marco4; Prommer，Henning1,2

2022

10.1016/j.apgeochem.2021.105155

APPLIED GEOCHEMISTRY   影响因子和分区

0883-2927

1872-9134

Arsenic (As) is one of the most harmful and widespread groundwater contaminants globally. Besides the occurrence of geogenic As pollution, there is also a large number of sites that have been polluted by anthropogenic activities, with many of those requiring active remediation to reduce their environmental impact. Cost-effective remedial strategies are however still sorely needed. At the laboratory-scale in situ formation of magnetite through the joint addition of nitrate and Fe(II) has shown to be a promising new technique. However, its applicability under a wider range of environmental conditions still needs to be assessed. Here we use sediment and groundwater from a severely polluted coastal aquifer and explore the efficiency of nitrate-Fe(II) treatments in mitigating dissolved As concentrations. In selected experiments >99% of dissolved As was removed, compared to unamended controls, and maintained upon addition of lactate, a labile organic carbon source. Pre- and post-experimental characterisation of iron (Fe) mineral phases suggested a >90% loss of amorphous Fe oxides in favour of increased crystalline, recalcitrant oxide and sulfide phases. Magnetite formation did not occur via the nitrate-dependent oxidation of the amended Fe(II) as originally expected. Instead, magnetite is thought to have formed by the Fe(II)-catalysed transformation of pre-existing amorphous and crystalline Fe oxides. The extent of amorphous and crystalline Fe oxide transformation was then limited by the exhaustion of dissolved Fe(II). Elevated phosphate concentrations lowered the treatment efficacy, indicating joint removal of phosphate is necessary for maximum impact. The remedial efficiency was not impacted by varying salinities, thus rendering the tested approach a viable remediation method for coastal aquifers.

Arsenic remediation Bioremediation Coastal aquifer In situ mineral precipitation

SCI ; EI

英语

其他

U.S. National Science Foundation (NSF) grant[EAR-1521356] ; U.S. National Institute of Environmental Health Sciences["P42 ES010349","2T32 ES007322"]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000798059900003

PERGAMON-ELSEVIER SCIENCE LTD

20215011326003

Aquifers ; Bioremediation ; Cost effectiveness ; Dissolution ; Efficiency ; Groundwater pollution ; Groundwater resources ; Hydrogeology ; Magnetite ; Nitrates ; Organic carbon ; Pyrites ; Sulfur compounds

Groundwater:444.2 ; Water Pollution Sources:453.1 ; Environmental Impact and Protection:454.2 ; Geology:481.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Industrial Economics:911.2 ; Production Engineering:913.1

GEOSCIENCES

2-s2.0-85121009005

Scopus

1.School of Earth Sciences,University of Western Australia,Crawley,Australia
2.CSIRO Land and Water,Wembley,Australia
3.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,China
4.Dept. of Earth Sciences,“Sapienza” University of Rome,Rome,Italy
5.SIMAU,Polytechnic University of Marche,Ancona,Italy
6.Lamont-Doherty Earth Observatory of Columbia University,New York,United States
7.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
8.DISTABIF,University of Campania “Luigi Vanvitelli”,Caserta,Italy

Barron，Alyssa,Sun，Jing,Passaretti，Stefania,et al. In situ arsenic immobilisation for coastal aquifers using stimulated iron cycling: Lab-based viability assessment[J]. APPLIED GEOCHEMISTRY,2022,136.

Barron，Alyssa.,Sun，Jing.,Passaretti，Stefania.,Sbarbati，Chiara.,Barbieri，Maurizio.,...&Prommer，Henning.(2022).In situ arsenic immobilisation for coastal aquifers using stimulated iron cycling: Lab-based viability assessment.APPLIED GEOCHEMISTRY,136.

Barron，Alyssa,et al."In situ arsenic immobilisation for coastal aquifers using stimulated iron cycling: Lab-based viability assessment".APPLIED GEOCHEMISTRY 136(2022).