Metallic iron for water treatment: leaving the valley of confusion

Makota, Susanne; Ndé-Tchoupé, Arnaud Igor; Mwakabona, Hezron T.; Tepong-Tsindé, Raoul; Noubactep, Chicgoua; Nassi, Achille; Njau, Karoli N.

doi:10.1007/s13201-017-0601-x

Cited by 42 publications

(59 citation statements)

References 223 publications

(314 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent investigations have shown that the true problem of Fe 0 filters is the time-dependent loss of permeability [66][67][68]. According to Makota et al [67], 'reactivity loss' is a mirage as it is just the natural decrease of the corrosion rate which is never a linear function of time [35].…”

Section: The Service Life Of Fe 0 Filtersmentioning

confidence: 99%

See 1 more Smart Citation

The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters

Ndé-Tchoupé

Makota

Nassi

et al. 2018

Water

Self Cite

View full text Add to dashboard Cite

Continuous gravity-fed column experiments using the methylene blue (MB) discoloration method were performed to characterize the suitability of a pozzolan (PZ) specimen as alternative admixing aggregate for metallic iron filters (Fe 0 -filters). Investigated systems were: (i) pure sand, (ii) pure PZ, (iii) pure Fe 0 , (iv) Fe 0 /sand, (v) Fe 0 /PZ, and (vi) Fe 0 /sand/PZ. The volumetric proportion of Fe 0 was 25%. The volumetric proportions of the Fe 0 /sand/PZ system was 25/45/30. The initial MB concentration was 2.0 mg·L −1 , 6.0 g of Fe 0 was used, and the experiments lasted for 46 days. The individual systems were fed with 3.9 to 8.4 L (7.80 to 16.69 mg of MB) and were characterized by the time-dependent changes of: (i) the pH value, (ii) the iron breakthrough, (iii) the MB breakthrough, and (iv) the hydraulic conductivity. Results showed that the Fe 0 /sand/PZ system was the most efficient. This ternary system was also the most permeable and therefore the most sustainable. The suitability of MB as a powerful operative indicator for the characterization of processes in the Fe 0 /H 2 O system was confirmed. The tested PZ is recommended as an alternative material for efficient but sustainable Fe 0 filters.

show abstract

Section: The Service Life Of Fe 0 Filtersmentioning

confidence: 99%

“…According to Makota et al [67], 'reactivity loss' is a mirage as it is just the natural decrease of the corrosion rate which is never a linear function of time [35]. In other words, if a proper material is selected, the major remaining task is to control the hydraulic conductivity (permeability).…”

Section: The Service Life Of Fe 0 Filtersmentioning

confidence: 99%

The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters

Ndé-Tchoupé

Makota

Nassi

et al. 2018

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…As it is now established that systematic flaws were governing research on Fe 0 for environmental remediation [35,44,45,53,55,[57][58][59][60][61], there have been some injustice within the research community. In particular, the demands for research money is much larger than the supply.…”

Section: The Assessment Of the Peer Review System Questionedmentioning

confidence: 99%

“…The situation is worsen by the evidence that the Fe 0 filtration technology was introduced by distorting the stream of corrosion science and overseeing many other aspects of General Chemistry. In particular, the favoured reductive transformation concept is even not valid in the concentration range of concern (µg/L) [38,53,56,57]. Thus a paradigm shift of the current understanding for Fe 0 filtration technology is very much demanding before the future researchers are dragged deeper into confusion [95].…”

Section: Should Scientists Learn From Politicians?mentioning

confidence: 99%

“…Based on these observations and evidences that alternative views have been constantly refuted [8,[46][47][48][49][50] or belittled [51,52]. It is fair to argue that the Fe 0 remediation research has progressed on an unsustainable path [53]. In the light of these findings, an attempt has been made in this communication to describe how this situation arose and proposes/ reiterates some possible remedies.…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Rescuing Fe0 remediation research from its systemic flaws

Noubactep¹,

Makota²,

Bandyopadhyay³

2017

Res Rev Insights

Self Cite

View full text Add to dashboard Cite

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.

show abstract

In Situ Chemical Reduction of Chlorinated Organic Compounds

Rodrigues

Betelu

Colombano

et al. 2020

Applied Environmental Science and Engineering for a Sustainable Future

View full text Add to dashboard Cite

Chlorinated organic compounds (COCs) are common anthropogenic contaminants of soil and groundwater. COCs were industrially produced for different applications, such as dry cleaning, degreasing, or as pesticides. The presence of COCs in the environment is a major concern because of their toxicity and persistence.The most widely used method for their remediation is the conventional pump-and-treat system. However, this technology can hardly achieve a complete remediation because of geological characteristics and the presence of pore space pollution/adsorbed pollution, leading to a residual saturation. Hence, in addition to the improvement of pump-and-treat systems, in situ chemical processes have been largely developed. These chemical processes involve the injection of chemical reagents for the removal of residual source pollution and/or the treatment of plume contamination. Chemical degradation of COCs can be achieved by oxidative or reductive processes. If chemical oxidation has been first developed for in situ application, chemical reduction is one of the most important emerging remediation techniques for COCs treatment. Due to the electronegative character of chlorine substituents, COCs can effectively be transformed via reductive pathways. Moreover, reductive dechlorination has shown higher efficiency on highly chlorinated compounds. This chapter focuses on the presentation of the chemical reduction of the most common COCs pollutants, followed by kinetic and mechanistic approaches related to the use of iron-based particles. Developments on in situ chemical reduction technologies in order to enhance remediation rates are also exposed. Influence of environmental conditions for in situ applications is then developed. Finally, a case study is presented.

show abstract

Metallic iron for water treatment: leaving the valley of confusion

Abstract: Researchers on metallic iron (Fe 0

Cited by 42 publications

References 223 publications

The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters

The Suitability of Pozzolan as Admixing Aggregate for Fe0-Based Filters

Rescuing Fe0 remediation research from its systemic flaws

In Situ Chemical Reduction of Chlorinated Organic Compounds

Contact Info

Product

Resources

About