Optimising the Design of Fe0-Based Filtration Systems for Water Treatment: The Suitability of Porous Iron Composites

Noubactep,

doi:10.6000/1929-5030.2013.02.03.2

Cited by 28 publications

(3 citation statements)

References 102 publications

(157 reference statements)

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“…However, previous and current evaluations either neglect or insufficiently address interlinkages among factors influencing the performance of the systems. In particular, investigating the influences of admixing Fe 0 and other aggregates has been performed in the perspective that the aggregates will reduce the efficiency of the systems (Rahman et al 2013, Bilardi et al 2023.…”

Section: Knowledge Gaps On Both Aspects and Their Interlinkagesmentioning

confidence: 99%

“…The ambivalent nature of iron corrosion for the sustainability of Fe 0 -based filters has been difficult to consider in previous works (Wu et al 2017, Bilardi et al 2023, Saadatpour et al 2023): iron corrosion induces water treatment (beneficial), and the same reaction causes porosity loss (harmful) (Henserson andDemond 2007, Domga et al 2015). This makes designing efficient and sustainable Fe 0 filters challenging (Miyajima 2012, Rahman et al 2013, Yang 2022. The three fundamental questions to answer are: (i) how much iron oxidizes (e.g.…”

Section: Chapter 2: Literature Reviewmentioning

confidence: 99%

“…A porous bed is characterized by an initial porosity, e.g. 36 % for compact spheres (Caré et al 2013, Rahman et al 2013) which necessarily decreased over the time as contaminants are eliminated from inflowing polluted waters.…”

Section: Fe 0 Corrosion In Porous Mediamentioning

confidence: 99%

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Effects of solid additives and inorganic ligands on the efficiency of metallic iron- based water treatment system

Tao

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Metallic iron (Fe 0 ) or zero-valent iron (ZVI) has been extensively used for water remediation during the past three decades. It has been proven to be effective in treating waters polluted with chlorinated aliphatics, dyes, heavy metals, pathogens, radionuclides and more. Fe 0 is an abundant, low-cost, and non-toxic reactive metal. Its environmental reactivity is justified by the negative electrode potential of the redox couple Fe II /Fe 0 (E 0 = -0.44 V). These characteristics of Fe 0 have been exploited in a wide range of remediation technologies, including both permeable reactive barriers (PRBs) for in-situ groundwater remediation, and filtration systems (Fe 0 filters) for decentralized water treatment. Fe 0 PRBs and Fe 0 water filters employ Fe 0 and other solid aggregates (e.g. MnO2, pyrite, sand) to passively remediate polluted waters in a reactive zone. A polluted water flowing through a reactive zone packed with Fe 0 is ideally satisfactorily decontaminated, meaning that the contaminant concentrations in the outflow are below regulatory levels (called maximum contamination level -MCL).

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Section: Knowledge Gaps On Both Aspects and Their Interlinkagesmentioning

confidence: 99%

Section: Chapter 2: Literature Reviewmentioning

confidence: 99%

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Effects of solid additives and inorganic ligands on the efficiency of metallic iron- based water treatment system

Tao

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Designing Metallic Iron Packed‐Beds for Water Treatment: A Critical Review

Noubactep¹

2016

CLEAN Soil Air Water

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Filtration systems based on metallic iron (Fe0 filters) have been successfully used for water treatment over the past two decades. Relevant Fe0 filters expand from subsurface permeable reactive barriers (PRBs) to household filters. Fe0 filters systems are shown efficient for the remediation of biological and chemical contamination. Properly designing a Fe0 filter is finding a long‐term balance between two major interdependent design parameters: (i) Fe0 reactivity, and (ii) filter permeability. Other relevant design parameters include (i) aqueous flow velocity, (ii) bed thickness, and (iii) water chemistry. Water chemistry includes nature and extent of contamination. To date, attempts to design more sustainable Fe0 filters have been mostly pragmatic as: (i) reactive Fe0 has failed to be considered as in situ generator of contaminant collectors (and “secondary” reducing agents), and (ii) the volumetric expansive nature of iron corrosion has been overlooked. On the other hand, valuable design criteria were available in the hydrometallurgical literature (cementation using elemental metals) prior to the advent of Fe0 filters. As a consequence the literature is full of seemingly controversial results which are easily conciliated by the physico–chemistry of the system. The present review is limited at identifying some misconceptions and demonstrating their proliferation. Tools for better analyses are recalled. Recent X‐ray tomography data are used as illustration of how valuable data are insufficiently discussed. It is hoped that the present contribution will boost systematic research for the design of more sustainable Fe0 filters.

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No Scientific Debate in the Zero‐Valent Iron Literature

Noubactep¹

2016

CLEAN Soil Air Water

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Since the 1930s, the modern science of aqueous iron corrosion has been established by scientists like J. O'M. Bockris, M. Cohen, U. R. Evans, Y. M. Kolotrykin, G. Okamoto, M. Pourbaix, H. H. Uhlig, or K. J. Vetter. Yet, the electrochemical nature of aqueous iron corrosion is seriously questioned by flawed science. Especially, metallic iron (Fe0) was mistakenly introduced in the 1990s as an environmental reducing agent. Fe0 was then successfully used in subsurface permeable reactive barriers to treat contaminated groundwater. This commentary recalls that observed contaminant degradation/reduction is not the cathodic reaction simultaneous to iron oxidative dissolution. It is concluded that the Fe0 remediation community is working against creativity and innovation.

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Optimising the Design of Fe0-Based Filtration Systems for Water Treatment: The Suitability of Porous Iron Composites

Cited by 28 publications

References 102 publications

Effects of solid additives and inorganic ligands on the efficiency of metallic iron- based water treatment system

Effects of solid additives and inorganic ligands on the efficiency of metallic iron- based water treatment system

Designing Metallic Iron Packed‐Beds for Water Treatment: A Critical Review

No Scientific Debate in the Zero‐Valent Iron Literature

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