Effects of common dissolved anions on the efficiency of Fe0-based remediation systems

Tao, Ran; Hu, Rui; Gwenzi, Willis; Ruppert, Hans; Noubactep, Chicgoua

doi:10.1016/j.jenvman.2024.120566

Journal of Environmental Management

2024

DOI: 10.1016/j.jenvman.2024.120566

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Effects of common dissolved anions on the efficiency of Fe0-based remediation systems

Ran Tao,

Rui Hu,

Willis Gwenzi

et al.

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Cited by 1 publication

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Materials for sustainable metallic iron-based water filters: a review

Xiao,

Hu,

Gwenzi

et al. 2024

Environ Chem Lett

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Water pollution is calling for a sustainable remediation method such as the use of metallic iron (Fe0) to reduce and filter some pollutants, yet the reactivity and hydraulic conductivity of iron filters decline over time under field conditions. Here we review iron filters with focus on metallic corrosion in porous media, flaws in designing iron filters, next-generation filters and perspectives such as safe drinking water supply, iron for anaemia control and coping with a reactive material. We argue that assumptions sustaining the design of current Fe0 filters are not valid because proposed solutions address the issues of declining iron reactivity and hydraulic conductivity separately. Alternatively, a recent approach suggest that each individual Fe0 atom corroding within a filter contributes to both reactivity and permeability loss. This approach applies well to alternative iron materials such as bimetallics, composites, hybrid aggregates, e.g. Fe0/sand, and nano-Fe0. Characterizing the intrinsic reactivity of individual Fe0 materials is a prerequisite to designing sustainable filters. Indeed, Fe0 ratio, Fe0 type, Fe0 shape, initial porosity, e.g. pore size and pore size distribution, and nature and size of admixing aggregates, e.g. pumice, pyrite and sand, are interrelated parameters which all influence the generation and accumulation of iron corrosion products. Fe0 should be characterized in long-term experiments, e.g. 12 months or longer, for Fe dissolution, H2 generation and removal of contaminants in three media, i.e., tap water, spring water and saline water, to allow reactivity comparison and designing field-scale filters.

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Materials for sustainable metallic iron-based water filters: a review

Xiao,

Hu,

Gwenzi

et al. 2024

Environ Chem Lett

View full text Add to dashboard Cite

show abstract

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Effects of common dissolved anions on the efficiency of Fe0-based remediation systems

Cited by 1 publication

References 106 publications

Materials for sustainable metallic iron-based water filters: a review

Materials for sustainable metallic iron-based water filters: a review

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