Modelling of bentonite–granite solutes transfer from an in situ full-scale experiment to simulate a deep geological repository (Grimsel Test Site, Switzerland)

2010 ◽  
Vol 25 (12) ◽  
pp. 1797-1804 ◽  
Author(s):  
B. Buil ◽  
P. Gómez ◽  
J. Peña ◽  
A. Garralón ◽  
M.J. Turrero ◽  
...  
Keyword(s):  
Test Site ◽  
Full Scale ◽  
Deep Geological Repository ◽  
Full Scale Experiment ◽  
Geological Repository ◽  
Grimsel Test Site ◽  
Scale Experiment

In situ Denitrification of Drinking Water

1988 ◽  
Vol 20 (3) ◽  
pp. 215-219 ◽  
Author(s):  
V. Janda ◽  
J. Rudovský ◽  
J. Wanner ◽  
K. Marha
Keyword(s):  
Drinking Water ◽  
Pilot Plant ◽  
Nitrate Removal ◽  
Full Scale ◽  
Injection Wells ◽  
Full Scale Experiment ◽  
The Subject ◽  
Scale Experiment ◽  
Pilot Plant Study

Pilot-plant and full scale studies of the in-situ biological denitrification of drinking water form the subject of this paper. Ethyl alcohol as a source of organic carbon was used in both cases. Good results were obtained during the pilot-plant study. The full-scale experiment was carried out as a system of four injection wells and one central collection well. Promising results were obtained when diluting water was recirculated into the injection wells to improve mixing of substrate in ground water. The efficiency of nitrate removal was about 50%.

Modeling of an in-situ diffusion experiment in granite at the Grimsel Test Site

2014 ◽  
Vol 1665 ◽  
pp. 85-91 ◽  
Author(s):  
Josep M. Soler ◽  
Jiri Landa ◽  
Vaclava Havlova ◽  
Yukio Tachi ◽  
Takanori Ebina ◽  
...  
Keyword(s):  
Effective Diffusion ◽  
Test Site ◽  
Diffusion Experiment ◽  
Bulk Rock ◽  
Disturbed Zone ◽  
Mean Grain Size ◽  
Grimsel Test Site ◽  
In Situ Diffusion

ABSTRACTMatrix diffusion is a key process for radionuclide retention in crystalline rocks. Within the LTD project (Long-Term Diffusion), an in-situ diffusion experiment in unaltered non-fractured granite was performed at the Grimsel Test Site (www.grimsel.com, Switzerland). The tracers included 3H as HTO, 22Na+, 134Cs+ and 131I- with stable I- as carrier.The dataset (except for 131I- because of complete decay) was analyzed with different diffusion-sorption models by different teams (NAGRA / IDAEA-CSIC, UJV-Rez, JAEA, Univ. Poitiers) using different codes, with the goal of obtaining effective diffusion coefficients (De) and porosity (ϕ) or rock capacity (α) values. A Borehole Disturbed Zone (BDZ), which was observed in the rock profile data for 22Na+ and 134Cs+, had to be taken into account to fit the experimental observations. The extension of the BDZ (1-2 mm) was about the same magnitude as the mean grain size of the quartz and feldspar grains.De and α values for the different tracers in the BDZ are larger than the respective values in the bulk rock. Capacity factors in the bulk rock are largest for Cs+ (strong sorption) and smallest for 3H (no sorption). However, 3H seems to display large α values in the BDZ. This phenomenon will be investigated in more detail in a second test starting in 2013.

scholarly journals Investigations of electrophysical monitoring in a full-scale experiment to clean soil contaminated with oil

2020 ◽  
Vol 177 ◽  
pp. 04003
Author(s):  
Sergey Prostov ◽  
Evgeniy Shabanov
Keyword(s):  
High Efficiency ◽  
Oil Pollution ◽  
Soil Mass ◽  
Full Scale ◽  
Used Oil ◽  
Complex Processes ◽  
Full Scale Experiment ◽  
Scale Experiment ◽  
Processing Zone ◽  
Conductive Properties

This article presents the main results of the study of electrophysical processes occurring in the zone of electrical processing during the cleaning of soils from oil pollution. The main conclusions are formulated about the processes occurring in the electric processing zone by changing the relative electrical resistance of the soil, which was measured using microprobe sensors. A comparative analysis of the results of a laboratory experiment on the electrochemical cleaning of contaminated soil in a tank is carried out with the results of a full-scale experiment conducted on a plot of a soil mass in real conditions, but artificially contaminated with oil products (gasoline, used oil. Using single measurements of electrical resistivity by microprobe sensors, the spread of the pollutant in the soil was clarified , the relationship between the physical properties of the array and its electrical wire is established conductive properties. Confirmed high efficiency of this type of control in the study of complex processes occurring in the contaminated ground array.

Water balance comparison between a dry and a wet landfill — a full-scale experiment

2001 ◽  
Vol 251 (1-2) ◽  
pp. 29-48 ◽  
Author(s):  
S.T.S. Yuen ◽  
Q.J. Wang ◽  
J.R. Styles ◽  
T.A. McMahon
Keyword(s):  
Water Balance ◽  
Full Scale ◽  
Full Scale Experiment ◽  
Scale Experiment

Studies on radionuclide transport behaviour–The next generation of in-situ experiments at the Grimsel Test Site

2009 ◽  
Vol 1193 ◽  
Author(s):  
Andrew James Martin ◽  
Ingo Blechschmidt
Keyword(s):  
Shear Zone ◽  
Diffusion Processes ◽  
Test Site ◽  
Core Material ◽  
Laboratory Studies ◽  
Grimsel Test Site ◽  
And Migration ◽  
Colloid Formation

AbstractTwo recent ongoing major projects at the Grimsel Test Site (GTS) (www.grimsel.com) that were initiated to simulate the long-term behaviour of radionuclides in the repository near-field and the surrounding host rock are presented: the Colloid Formation and Migration (CFM) project, which focuses on colloid generation and migration from a bentonite source doped with radionuclides and the Long-Term Diffusion (LTD) project, which aims at in-situ verification and understanding of the processes that control the long-term diffusion of repository-relevant radionuclides. So far, the CFM project has principally involved: development and implementation of a state-of-the-art sealing concept to control hydraulic gradients in a shear zone to imitate repository-relevant conditions; extensive laboratory studies to examine bentonite erosion and colloid formation in a shear zone; and, development of models to estimate colloid formation and migration. The next stage will be to assess the behavior of bentonite colloids generated from a radionuclide spiked bentonite source-term emplaced into the controlled flow field of the shear zone. This will be coupled with further extensive laboratory studies in order to refine and evaluate the colloid models currently used in performance assessments. The LTD project consists of: a monopole diffusion experiment where weakly sorbing and non-sorbing radionuclides (3H, 22Na, 131I, 134Cs) have been circulating and diffusing into undisturbed rock matrix since June 2007; experiments to characterise pore space geometry, including determination of in-situ porosity with 14C doped MMA resin for comparison with laboratory derived data; a study of natural tracers to elucidate evidence of long-term diffusion processes; and, an investigation of the in-situ matrix diffusion paths in core material from earlier GTS experiments. Future experiments will focus on diffusion processes starting from a water-conducting feature under realistic boundary conditions.

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