Long-term barrier performance of modified bentonite materials against sodium and calcium permeant solutions

Tanaka, Katsumi; Ishimori, Hiroyuki; Onikata, Masanobu; Fukagawa, Ryoichi

doi:10.1016/j.geotexmem.2007.04.003

Cited by 213 publications

(68 citation statements)

References 38 publications

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“…Treatment with PC not only improves the swelling properties but also the hydraulic conductivity of MSB. For example, permeability tests revealed that MSB had a hydraulic conductivity of 2.0610 À11 with 1 M NaCl whereas untreated bentonite had a hydraulic conductivity of 2.3610 À10 m/s (Katsumi et al, 2008). Verifying whether modified bentonites such as MSB can sustain any membrane behavior is of great interest for containment applications (Shackelford, 2005).…”

Section: Permeability and Membrane Behavior Of Bentonitesmentioning

confidence: 99%

“…The same trend of increasing swell with 5 mM CaCl 2 compared to DW and the tendency to form flocs was also observed in NB, albeit to a much lesser extent. Katsumi et al (2008) reported results of free swell tests on MSB in DW and in CaCl 2 solutions for concentrations ranging from 0.1 M to 0.5 M. They found that the free swell of MSB in CaCl 2 solutions was always less than in DW, but they reported no data for concentrations of <0.1 M. Katsumi et al (2008) also found that free swell results did not always correlate well with other properties of MSB. For example, they observed that the free swell of MSB increased from 28 mL in DW to 40 mL in 0.5 M NaCl, but the Liquid Limit decreased from 500% in DW to 320% in 0.5 M NaCl.…”

Section: Free Swellmentioning

confidence: 99%

“…This paper presents test results for MultiSwellable Bentonite (MSB), a chemically modified bentonite (Onikata et al, 1999). Previous research on the engineering properties of MSB has focused mainly on permeability and chemical compatibility Mazzieri and Pasqualini, 2006;Katsumi et al, 2008). In low-permeability barriers, diffusion may become the dominant pollutanttransport mechanism (Shackelford and Daniel, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of Calcium Chloride in a Modified Bentonite: Impact on Osmotic Efficiency and Hydraulic Conductivity

Mazzieri

Emidio

Impe

2010

Clays and clay miner.

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Abstract-Chemically modified bentonites are being developed with the aim of preserving low hydraulic conductivity in the presence of potentially aggressive permeants in pollutant-containment applications. 'Multiswellable' bentonite (MSB) has been obtained by treating standard sodium bentonite with propylene carbonate. Research on the engineering properties of MSB has focused mainly on permeability and chemical compatibility. Solute diffusion and membrane behavior in MSB have not yet been investigated. A combined chemico-osmotic/diffusion test was performed on a MSB specimen using a 5 mM CaCl 2 solution. Permeability with distilled water and with the 5 mM CaCl 2 solution was measured prior to and after the chemico-osmotic/diffusion tests. The material exhibited time-dependent membrane behavior with a peak osmotic efficiency value (o) of 0.172 that gradually shifted to zero upon breakthrough of calcium ions. Effective diffusion coefficients of calcium and chloride ions were in the range commonly described for untreated bentonite at similar porosities. After the chemico-osmotic/diffusion stage and permeation with 5 mM CaCl 2 , the hydraulic conductivity of MSB increased from 1.1610 À11 m/s to 7.0 610 À11 m/s. The MSB was apparently converted into a calcium-exchanged bentonite at the end of the test. Prehydration and subsequent permeation might have contributed to elution of the organic additive from the clay. Further investigation is recommended to clarify the effect of prehydration on the hydraulic performance of MSB in the presence of potentially aggressive permeants.

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Section: Permeability and Membrane Behavior Of Bentonitesmentioning

confidence: 99%

Section: Free Swellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffusion of Calcium Chloride in a Modified Bentonite: Impact on Osmotic Efficiency and Hydraulic Conductivity

Mazzieri

Emidio

Impe

2010

Clays and clay miner.

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“…A reduction in hydraulic conductivity values was also reported by Katsumi et al (2008) for long-term evaluation (1 to 7 years) of hydraulic conductivity of GCLs permeated with high ionic strength (I) solutions (especially for I > 0.5). Even though few studies have been done on long-term performance of GCLs permeated with ARD solutions, it is important to monitor changes in hydraulic conductivity over time, considering that GCLs are expected to provide a long-term service life.…”

Section: Effects Of Permeation Timementioning

confidence: 56%

“…Numerous studies have been done on the impact of municipal solid waste (MSW) leachate on GCLs' performance using different kind of inorganic salts, alkali and/or acid solutions, MSW leachates, and sea water solutions (Katsumi et al, 2008; Petrov and Rowe, 1997; Touze-Foltz et al, 2006). However, limited research has been conducted on the impact of ARD in GCLs' performance.…”

Section: Factors Affecting Hydraulic Conductivitymentioning

confidence: 99%

Factors influencing hydraulic conductivity and metal retention capacity of geosynthetic clay liners exposed to acid rock drainage

Naka

Flores

Tanaka

et al. 2016

JGS Special Publication

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Evaluating the factors that affect hydraulic conductivity and metal retention in geosynthetic clay liners (GCLs) becomes crucial in order to decide whether or not GCLs can be used as a barrier material in rock containments with potential for acid rock drainage (ARD) generation. This study presents a state-of-the-art review of the factors that impact the hydraulic conductivity and heavy metal retention on GCLs: effect of the type of bentonite inside GCLs, prehydration, confining pressure, pH, metal concentration, and type of metal ion in ARDs. ARDs affect the hydraulic performance of GCLs because of their characteristic low pH (usually lower than pH 3) and presence of different heavy metals and concentrations (especially the presence of divalent and trivalent metals). The retention of metals present in ARD through GCLs are governed by the pH (higher retention at pH higher than 3.5), the metals that are present in the ARD as well as the buffering capacity of the bentonite (determined by the cation exchange capacity of bentonite). Ion exchange constitutes the main mechanism for metal uptake, but other mechanisms also take place. Secondary sorption on ferrihydrite or gypsum (formed through precipitation of metals present in ARD) of metalloids such as As, which cannot be sorbed by bentonite directly, may also occur.

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Pendant cyclic carbonate‐polymer/Na‐smectite nanocomposites via in situ intercalative polymerization and solution intercalation

Shaheen

Turney

Saito

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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Nanocomposites of sodium smectite with polyether‐ and polystyrene‐containing pendant cyclic carbonates offer a novel approach to improving hydraulic barrier properties of Na‐smectite liners to saline leachates. The cyclic carbonate polyethers were prepared by cationic ring opening polymerization of a cyclic carbonate‐containing epoxide, whilst polystyrene polymers having pendant cyclic carbonate groups were obtained from radical photopolymerization of styrene. Na‐smectite nanocomposites of these polymers were formed via clay in situ polymerization and solution intercalation methods. X‐ray diffraction (XRD) and FT‐IR analysis confirmed that the polyether can be intercalated within the layers of smectite via in situ as well as solution intercalation of the pre‐formed polymer. The cyclic carbonate polyether nanocomposite was more resistant to leaching in 3M aqueous sodium chloride than its respective cyclic carbonate. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 2421–2429

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Long-term barrier performance of modified bentonite materials against sodium and calcium permeant solutions

Cited by 213 publications

References 38 publications

Diffusion of Calcium Chloride in a Modified Bentonite: Impact on Osmotic Efficiency and Hydraulic Conductivity

Diffusion of Calcium Chloride in a Modified Bentonite: Impact on Osmotic Efficiency and Hydraulic Conductivity

Factors influencing hydraulic conductivity and metal retention capacity of geosynthetic clay liners exposed to acid rock drainage

Pendant cyclic carbonate‐polymer/Na‐smectite nanocomposites via in situ intercalative polymerization and solution intercalation

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