Chemical osmosis in compacted clayey material and the prediction of water transport

Keijzer, T.J.S.; Kleingeld, P. J.; Loch, J. P. G.

doi:10.1016/s0013-7952(99)00028-9

Cited by 79 publications

(54 citation statements)

References 12 publications

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“…The liquid flux induced by chemical osmosis (kg/m 2 /s), J co , is written in a form similar to Darcy's law according to (Keijzer et al, 1999;Keijzer and Loch, 2001;Soler, 2001):…”

Section: Thermal and Chemical Osmosismentioning

confidence: 99%

“…where  is the water density (kg/m 3 ), K is the hydraulic conductivity (m/s),  is the reflection coefficient (Keijzer et al, 1999) or the coefficient of osmotic efficiency (Soler, 2001) and h  is the osmotic pressure head (m) which is defined as:…”

Section: Thermal and Chemical Osmosismentioning

confidence: 99%

“…Keijzer et al (1999) and Keijzer and Loch (2001) reported reflection coefficients from 0.001 to 0.3 for compacted Na-bentonite and from 0.015 to 0.03 for Wyoming bentonite. Soler (2001) used a reflection coefficient of 0.1 for Opalinus clay.…”

Section: 31relevance Of Chemical Osmosismentioning

confidence: 99%

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A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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The performance assessment of a geological repository for radioactive waste requires quantifying the geochemical evolution of the bentonite engineered barrier. This barrier will be exposed to coupled thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. This paper presents a coupled THC model of the FEBEX (Full-scale Engineered Barrier EXperiment) in situ test which accounts for bentonite swelling and chemical and thermal osmosis. Model results attest the relevance of thermal osmosis and bentonite swelling for the geochemical evolution of the bentonite barrier while chemical osmosis is found to be almost irrelevant. The model has been tested with data collected after the dismantling of heater 1 of the in situ test. The model reproduces reasonably well the measured temperature, relative humidity, water content and inferred geochemical data. However, it fails to mimic the solute concentrations at the heater-bentonite and bentonite-granite interfaces because the model does not account for the volume change of bentonite, the CO 2 (g) degassing and the transport of vapor from the bentonite into the granite. The inferred HCO 3 -and pH data cannot be explained solely by solute Page 2 of 54 transport, calcite dissolution and protonation/deprotonation by surface complexation, suggesting that such data may be affected also by other reactions.

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“…The liquid flux induced by chemical osmosis (kg/m 2 /s), J co , is written in a form similar to Darcy's law according to (Keijzer et al, 1999;Keijzer and Loch, 2001;Soler, 2001):…”

Section: Thermal and Chemical Osmosismentioning

confidence: 99%

Section: Thermal and Chemical Osmosismentioning

confidence: 99%

See 1 more Smart Citation

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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“…In order to do so, each sample was divided in several aliquots ( Figure 5) Fritz and Marine [1983], Keijzer et al [1999], and Kharaka and Berry [1973]. This clay liner had a chemico-osmotic coefficient equal to 0.63, probably much higher than that of Tournemire argillites (a coefficient of 1 corresponds to an ''ideal'' membrane completely restricting Figure 5.…”

Section: Characterizing the Various Reservoirs Of Chloridementioning

confidence: 99%

Diffusion as the main process for mass transport in very low water content argillites: 1. Chloride as a natural tracer for mass transport—Diffusion coefficient and concentration measurements in interstitial water

Patriarche

Michelot

Ledoux

et al. 2004

Water Resources Research

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[1] Argillites are one of the rock types studied by French authorities for their confining properties for the isolation of radioactive wastes. One of the main objectives of such study is the better understanding of water transport through rocks with very low water content and hydraulic conductivity, using modeling of tracer profiles. This article presents the protocol developed and applied for acquiring data on chloride in interstitial water of the Toarcian argillites in Tournemire (southern France). This protocol is based on laboratory experiments involving diffusion process and on modeling. Experimental data obtained during transient and steady parts of diffusion allow for the assessment of the diffusion coefficient and initial concentration in pore water, respectively. Profiles for both have been acquired along the geological sequence; they are used in part 2 of this article for proposing a hydrogeological model where diffusion appears to be the main process for mass transport through the argillites and for comparing deuterium and chloride transport.

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“…A lot of membranes can act as semipermeable membranes for water if they can exclude the ions but admit the transfer of water [28], such as reverse osmosis (RO) membrane (cellulose acetate membrane, aromatic polyamide membrane, etc.) [29], plant plasma membrane [30], and clays [28]. Osmosis is widely utilized for water purification, desalination in chemical industry [27,29], but rarely employed in chemical analysis.…”

Section: Introductionmentioning

confidence: 99%

Hollow fiber-based liquid–liquid–liquid micro-extraction with osmosis: I. Theoretical simulation and verification

Geng

et al. 2012

Journal of Chromatography A

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Chemical osmosis in compacted clayey material and the prediction of water transport

Cited by 79 publications

References 12 publications

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Diffusion as the main process for mass transport in very low water content argillites: 1. Chloride as a natural tracer for mass transport—Diffusion coefficient and concentration measurements in interstitial water

Hollow fiber-based liquid–liquid–liquid micro-extraction with osmosis: I. Theoretical simulation and verification

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