Effect of Pumice and Sand on the Sustainability of Granular Iron Beds for the Aqueous Removal of CuII, NiII, and ZnII

Bilardi, Stefania; Calabrò, Paolo S.; Caré, Sabine; Moraci, Nicola; Noubactep, Chicgoua

doi:10.1002/clen.201100472

Cited by 30 publications

(21 citation statements)

References 62 publications

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“…The next step was the demonstration that the volumetric expansive nature of iron corrosion was the main cause of system clogging as Fe 0 is corroded by water (Noubactep 2010a(Noubactep , 2013dNoubactep and Caré 2010a;Noubactep et al 2010;Noubactep and Caré 2011;Bilardi et al 2013a). As a consequence, it was established that admixing non-expansive additive (MnO 2 , pumice, sand) to Fe 0 is a pre-requisite for sustainable filters.…”

Section: The Way Forwardmentioning

confidence: 99%

“…In essence, the next work consists in building a database for the rate constant of Fe 0 materials under field conditions. Some laboratory and field designs were recently published (Noubactep 2011d;Noubactep et al 2012a;Caré et al 2013;Bilardi et al 2013aBilardi et al , 2013bNdé-Tchoupé et al 2015;Tepong-Tsindé et al 2015a;Li et al 2016 Appl Water Sci (2017) 7:4177-4196 4189 monitoring: (1) the aqueous Fe concentration, (2) the pH value, (3) the water flow velocity, and (4) the electric conductivity. Intermittently adding a contaminant, including an indicator like methylene blue (e.g., 250 mL every 2 months) and monitoring its behavior would help to discuss the efficiency of the investigated systems.…”

Section: The Way Forwardmentioning

confidence: 99%

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Metallic iron for water treatment: leaving the valley of confusion

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Section: The Way Forwardmentioning

confidence: 99%

Section: The Way Forwardmentioning

confidence: 99%

Metallic iron for water treatment: leaving the valley of confusion

et al. 2017

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“…The research community must realize now that this misconception has created a non-precedent confusion [35,44,45,[55][56][57][58][59][60]. Over the last decade, isolated researchers [8,23,[61][62][63][64][65][66][67][68] have corrected the mistake but the large majority is still confounding 'reduction in the presence of Fe 0 (including indirect reduction) and 'reduction by Fe 0 (direct reduction-electrons from Fe 0 ) [1][2][3]69,70].…”

Section: Source Of the Misconceptionmentioning

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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“…It has been unambiguously demonstrated that all tools used to accelerate lab-scale experiments collectively impair the reliability of the obtained test results [35,[65][66][67]. 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].…”

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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Effect of Pumice and Sand on the Sustainability of Granular Iron Beds for the Aqueous Removal of Cu^II, Ni^II, and Zn^II

Abstract: Running Title: Admixing pumice and sand to reactive Fe 0 sustains long-term metal removal. Acronym List PRB Permeable Reactive Barrier

Cited by 30 publications

References 62 publications

Metallic iron for water treatment: leaving the valley of confusion

Metallic iron for water treatment: leaving the valley of confusion

Rescuing Fe0 remediation research from its systemic flaws

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

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