Testing the suitability of metallic iron for environmental remediation: Discoloration of methylene blue in column studies

K., B.D. Btatkeu; Miyajima, K.; Noubactep, Chicgoua; Caré, Sabine

doi:10.1016/j.cej.2012.11.072

Cited by 50 publications

(103 citation statements)

References 54 publications

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“…The suitability of MB for this purpose arises from the fact that MB (cationic) has a very low affinity for iron hydroxides/oxides (pHpzc > 6.0) covering the surface of Fe 0 in Fe 0 /H2O systems. Under these conditions, the most reactive system is the one quantitatively producing iron oxides, or the one in which "early" MB breakthrough is observed [132]. From Figure 3 This hypothesis from MB discoloration (charge exclusion) was further confirmed/validated using two anionic dyes: Orange II and Reactive Red 120 [136,160].…”

Section: Discussionmentioning

confidence: 72%

“…A key factor which prevents cross correlation between Fe 0 water filtration studies is the absence of a standard reference material for Fe 0 [132]. Accordingly, even results obtained under similar conditions are not really comparable.…”

Section: /H2o Systemmentioning

confidence: 96%

“…Accordingly, even results obtained under similar conditions are not really comparable. A methodology to compare the intrinsic reactivity of Fe 0 materials was introduced [133], and was recently revisited [132,134], however it is yet to receive universal acceptance. On the other hand, a universal design rationale for the design of Fe 0 filters was presented by Noubactep and Caré [130,131] and progressively revisited [25,98,[121][122][123].…”

Section: /H2o Systemmentioning

confidence: 99%

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Testing Metallic Iron Filtration Systems for Decentralized Water Treatment at Pilot Scale

Tepong-Tsindé

Crane

Noubactep

et al. 2015

Water

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There are many factors to consider for the design of appropriate water treatment systems including: cost, the concentration and type of biological and/or chemical contamination, concentration limits at which contaminant(s) are required to be removed, required flow rate, level of local expertise for on-going maintenance, and social acceptance. An ideal technology should be effective at producing clean, potable water; however it must also be low-cost, low-energy (ideally energy-free) and require low-maintenance. The use of packed beds containing metallic iron (Fe 0 filters) has the potential to become a cheap widespread technology for both safe drinking water provision and wastewater treatment. for decentralized water treatment particularly in the developing world. A design for safe drinking water to a community of 100 people is also discussed as starting module. It is suggested that Fe 0 filters have the potential for significant worldwide applicability, but particularly in the developing world. The appropriate design of Fe 0 filters, however, is site-specific and dependent upon the availability of local expertise/materials.

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Section: Discussionmentioning

confidence: 72%

Section: /H2o Systemmentioning

confidence: 96%

Section: /H2o Systemmentioning

confidence: 99%

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Testing Metallic Iron Filtration Systems for Decentralized Water Treatment at Pilot Scale

Tepong-Tsindé

Crane

Noubactep

et al. 2015

Water

View full text Add to dashboard Cite

show abstract

“…A widely-used Fe 0 sample from iPuTech (Rheinfelde, Germany) has a grain size varying from 0.3 to 2.0 mm [16,47]. This diameter represents less than 1/10 of the thickness of the buried cast iron pipes investigated by Mohebbi and Li [50].…”

Section: Major Characteristics Of Fe 0 Materials For Water Filtersmentioning

confidence: 99%

“…Reactive Fe 0 materials used for water filters are characterized mostly by their size/thickness of less than 5.0 mm [46][47][48][49]. A widely-used Fe 0 sample from iPuTech (Rheinfelde, Germany) has a grain size varying from 0.3 to 2.0 mm [16,47].…”

Section: Major Characteristics Of Fe 0 Materials For Water Filtersmentioning

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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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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Testing the suitability of metallic iron for environmental remediation: Discoloration of methylene blue in column studies

Cited by 50 publications

References 54 publications

Testing Metallic Iron Filtration Systems for Decentralized Water Treatment at Pilot Scale

Testing Metallic Iron Filtration Systems for Decentralized Water Treatment at Pilot Scale

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

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

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