Characterizing the impact of MnO2 on the [47–49]efficiency of Fe0-based filtration systems

Btatkeu-K, Brice D.; Olvera‐Vargas, Hugo; Tchatchueng, Jean Bosco; Noubactep, Chicgoua; Caré, Sabine

doi:10.1016/j.cej.2014.04.059

Cited by 27 publications

(48 citation statements)

References 51 publications

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“…Tools to gain reliable design results from column studies were recently presented Allred 2012;Btatkeu-K et al 2013Btatkeu-K et al , 2014Miyajima and Noubactep 2015;Phukan 2015;Phukan et al 2015;Btatkeu-K. et al 2016;Phukan et al 2016). In this context, the differential adsorptive behavior of methylene blue onto sand and iron oxides (Mitchell et al 1955;Saha et al 2011) is used to follow the extent of in situ coating of sand in Fe 0 /sand filters.…”

Section: Designing Fe 0 Filters From Laboratory Datamentioning

confidence: 99%

“…An Fe 0 /H 2 O system is the home state of iron oxides (oxide scale) with adsorptive affinities to Fe II species and contaminants (Mitchell et al 1955;Miyajima 2012;Btatkeu-K et al 2014;Phukan 2015;Phukan et al 2015;Btatkeu-K. et al 2016;Phukan et al 2016 (Yao et al 1971). This knowledge was established prior to the introduction of the Fe 0 remediation technology (Tseng et al 1984;James et al 1992).…”

Section: Designing Fe 0 Filters From Laboratory Datamentioning

confidence: 99%

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Metallic iron for water treatment: leaving the valley of confusion

et al. 2017

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Section: Designing Fe 0 Filters From Laboratory Datamentioning

confidence: 99%

Section: Designing Fe 0 Filters From Laboratory Datamentioning

confidence: 99%

Metallic iron for water treatment: leaving the valley of confusion

et al. 2017

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“…Such experiments should not be stopped because contaminant breakthrough has occurred. In fact, the focus herein is on the efficiency of tested Fe 0 materials [69,71,72] and possibly characterizing the time to Fe 0 exhaustion (t 8 ). There is certainly an infinity of possibilities of experimental designs; the present effort will be limited to two approaches: (i) the sampling-port approach (in one column); (ii) the column-in-series approach.…”

Section: Ways To Reliable K Iron Valuesmentioning

confidence: 99%

“…Relevant tools include adding oxidizing agents to accelerate corrosion [58], increasing flow velocity [34] and using Fe 0 of smaller particle sizes and/or rapid small-scale column tests [65]. For the early phase of column operation, methylene blue (MB) discoloration has been proven a powerful indicator of reactivity [68][69][70][71][72][73][74]. Actually, the longest experiment with MB in this context lasted only for 4 months [69].…”

Section: (Section 2)mentioning

confidence: 99%

Predicting the Hydraulic Conductivity of Metallic Iron Filters: Modeling Gone Astray

Noubactep

2016

Water

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Abstract:Since its introduction about 25 years ago, metallic iron (Fe 0 ) has shown its potential as the key component of reactive filtration systems for contaminant removal in polluted waters. Technical applications of such systems can be enhanced by numerical simulation of a filter design to improve, e.g., the service time or the minimum permeability of a prospected system to warrant the required output water quality. This communication discusses the relevant input quantities into such a simulation model, illustrates the possible simplifications and identifies the lack of relevant thermodynamic and kinetic data. As a result, necessary steps are outlined that may improve the numerical simulation and, consequently, the technical design of Fe 0 filters. Following a general overview on the key reactions in a Fe 0 system, the importance of iron corrosion kinetics is illustrated. Iron corrosion kinetics, expressed as a rate constant k iron , determines both the removal rate of contaminants and the average permeability loss of the filter system. While the relevance of a reasonable estimate of k iron is thus obvious, information is scarce. As a conclusion, systematic experiments for the determination of k iron values are suggested to improve the database of this key input parameter to Fe 0 filters.

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“…More than 200 Fe 0 -based reactive walls are installed worldwide and are performing well [10,36]. Some rules of thumb are now available to design efficient and sustainable Fe 0 filters, based on these and other achievements [37,38].…”

Section: Introductionmentioning

confidence: 99%

Rescuing Fe0 remediation research from its systemic flaws

Noubactep¹,

Makota²,

Bandyopadhyay³

2017

Res Rev Insights

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The well-accepted assumption of metallic iron (Fe 0 ) acting as electron donor for environmental remediation has created an unstable domain of knowledge for the past 23 years. This assumption is discouraging some outstanding and prospective scientists from correctly interpreting their experimental results. Such a situation is a recipe for long-term decline. The critical situation cannot be solved with simplistic approaches. It is now imperative to develop an understanding to defend the difficulties of this assumption and re-orient Fe 0 mediated remediation research as a whole.

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Characterizing the impact of MnO2 on the [47–49]efficiency of Fe0-based filtration systems

Cited by 27 publications

References 51 publications

Metallic iron for water treatment: leaving the valley of confusion

Metallic iron for water treatment: leaving the valley of confusion

Predicting the Hydraulic Conductivity of Metallic Iron Filters: Modeling Gone Astray

Rescuing Fe0 remediation research from its systemic flaws

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