Evaluation of five strategies to limit the impact of fouling in permeable reactive barriers

Li, Lin; Benson, Craig H.

doi:10.1016/j.jhazmat.2010.04.113

Cited by 75 publications

(57 citation statements)

References 37 publications

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“…Available Fe 0 materials are obtained from various sources [8][9][10][11][12] and are supposed to satisfy design expectations [7,[13][14][15][16][17]. However, there is no standard method to access the suitability of Fe 0 materials for individual applications.…”

mentioning

confidence: 99%

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

Miyajima²,

Noubactep³

et al. 2013

Chemical Engineering Journal

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A new method to correlate intrinsic reactivity and treatability efficiency of metallic iron ( Metallic iron (Fe 0 ) is a reactive material currently used for environmental remediation and safe drinking water provision [1][2][3][4][5][6][7]. Available Fe 0 materials are obtained from various sources [8][9][10][11][12] and are supposed to satisfy design expectations [7,[13][14][15][16][17]. However, there is no standard method to access the suitability of Fe 0 materials for individual applications. As a rule, used materials are characterized: (i) by selected physical and chemical parameters (e.g.elemental composition, particle size, surface area) and (ii) for their ability to remove the specific species of interest (efficiency in treatability studies) [11,18,19]. However, each reactive material should be primarily characterized by its intrinsic reactivity.The 'intrinsic reactivity' is a material-dependent but system-independent qualitative trend.The 'removal efficiency' or 'treatability efficiency' is a system-dependent quantifiable

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confidence: 99%

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

Miyajima²,

Noubactep³

et al. 2013

Chemical Engineering Journal

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“…Fe 0 PRBs are currently believed to create redox conditions for contaminant degradation or immobilization [2]. Accordingly, the precipitation of iron corrosion products and other secondary minerals is regarded as perturbing side effect yielding reactivity and porosity loss [2,14,16,17].…”

Section: Current Design Approach To Limit Fe 0 Prb Cloggingmentioning

confidence: 99%

“…Accordingly, the precipitation of iron corrosion products and other secondary minerals is regarded as perturbing side effect yielding reactivity and porosity loss [2,14,16,17]. Accordingly, the design of a PRB requires profound knowledge of local water flow velocity (residence time), aquifer porosity, influent contaminant concentration.…”

Section: Current Design Approach To Limit Fe 0 Prb Cloggingmentioning

confidence: 99%

“…Moreover, these processes proceed in the inter-granular porosity of the packed beds which are made up of Fe 0 (100 %) or a mixture of Fe 0 and an inert material (e.g. gravel, pumice, sand) [2,14]. Because of the volumetric expansive nature of the process of iron corrosion [15], the porosity of the filtrating systems certainly decreases with increasing service life, possibly yielding complete permeability loss system (filter clogging) [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Packed beds with metallic iron (Fe 0 ) are currently used as contaminant mitigating agent in several contexts including groundwater remediation, wastewater treatment and drinking water production [1][2][3][4]. Fe 0 -based materials are used in particular (i) as reducing agents in permeable reactive walls [5][6][7][8], and (ii) as reagents to assist biofiltration in household filters [3,9,10].…”

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Dimensioning metallic iron beds for efficient contaminant removal

Noubactep¹,

Caré

2010

Chemical Engineering Journal

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Remediation of contaminated groundwater is an expensive and lengthy process. (ii) used Fe 0 amounts must represent 30 to 60 vol-% of the mixture, and (iii) Fe 0 beds are deep-bed filtration systems. The major output of this study is that thicker barriers are needed for long service life. Fe 0 filters for save drinking water production should use several filters in series to achieve the treatment goal. In all cases proper material selection is an essential issue. [5][6][7][8], and (ii) as reagents to assist biofiltration in household filters [3,9,10]. The fundamental process responsible for contaminant removal in both contexts is necessarily the oxidative dissolution of Fe 0 (iron corrosion) which may be coupled with contaminant reduction (reactive walls) or the subsequent precipitation of iron hydroxides which may be coupled with contaminant adsorption and co-precipitation (household filters).Adsorption, co-precipitation and chemical transformations (oxidation and/or reduction) are not mutually exclusive [11][12][13]. It is obvious that in household filters and reactive walls, a synergy between these three processes is responsible for expected and observed decontamination. Moreover, these processes proceed in the inter-granular porosity of the packed beds which are made up of Fe 0 (100 %) or a mixture of Fe 0 and an inert material (e.g. gravel, pumice, sand) [2,14]. Because of the volumetric expansive nature of the process of iron corrosion [15], the porosity of the filtrating systems certainly decreases with increasing service life, possibly yielding complete permeability loss system (filter clogging) [16,17]. The filling of the pore volume by corrosion products is necessarily coupled with improved size exclusion capacity. Therefore, a fourth mechanism for decontamination in packed Fe 0 beds is The concept that contaminants are fundamentally removed by adsorption and co-precipitation is consistent with many experimental observations which remained non-elucidated by the reductive transformation concept [11,12]. Although researchers are continuing to maintain the validity of the latter concept [24][25][26], the new concept was validated [27,28] and has been independently verified [29,30]. As a matter of course the concept of adsorption/co- Metallic iron for household filtersWhile using slow sand filtration for water treatment in rural Bangladesh, it was observed that the filter efficiency for arsenic removal depends on the iron content of natural waters. Arsenic was readily removed from Fe-rich natural waters. Accordingly, Fe 0 is used "to provide a constant input of iron (soluble or surface precipitate) for groundwater low in soluble iron"[32]. The very efficient resulting filter for As removal was the 3-Kolsi filter [10,33]. A typical 3-Kolsi filter contained a layer of about 3 kg Fe 0 (100 % Fe 0 ). However, the 3-Kolsi filter was not sustainable as it clogged after some 8 weeks of operation [3,34].The remarkable efficiency of 3-Kolsi filters has prompted researchers to further develop the system fo...

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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

Bilardi

Calabrò

Caré

et al. 2013

CLEAN Soil Air Water

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Evaluation of five strategies to limit the impact of fouling in permeable reactive barriers

Cited by 75 publications

References 37 publications

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

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

Dimensioning metallic iron beds for efficient contaminant removal

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

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Evaluation of five strategies to limit the impact of fouling in permeable reactive barriers

Cited by 75 publications

References 37 publications

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

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

Dimensioning metallic iron beds for efficient contaminant removal

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

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Product

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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