Studying radionuclide migration on different scales: the complementary roles of laboratory and in situ experiments

Loon, Luc R. Van; Glaus, Martin A.; Ferry, Cécile; Latrille, Christelle

doi:10.1533/9780857097194.2.446

Cited by 5 publications

(2 citation statements)

References 112 publications

(98 reference statements)

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“…SO 4 2– clearly shows a Donnan exclusion effect due to permanent negative charges at the CEM surface. SO 4 2– has slower migration and effective diffusion coefficient than NH 4 + . , Even though the electric force cannot drive Na + migration to the CEM, its concentration potential is large enough to impose a strong force so that Na + carrying a positive charge is adsorbed by the anion in CEM.…”

Section: Discussionmentioning

confidence: 99%

Ammonia Recovery from Wastewater as a Fuel: Effects of Supporting Electrolyte on Ammonium Permeation through a Cation-Exchange Membrane

Liu

et al. 2022

ACS Omega

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Electrodeionization (EDI) is used to recover ammonia from wastewater as a fuel, but how its performance for ammonia recovery is affected by the supporting electrolyte is not very clear. This study involved experimental tests and theoretical calculations on NH 3 recovery, NH 4 + permeation, and NH 4 + and Na + interacting with the functional groups in a cation exchange membrane (CEM) using Na 2 SO 4 as the supporting electrolyte. The results demonstrated that a low concentration (≤0.250 mol L –1 of Na 2 SO 4 ) was conducive to NH 4 + permeation, while the a concentration (0.750 mol L –1 of Na 2 SO 4 ) hindered NH 4 + permeation. A maximum recovery efficiency of ammonia of 80.00%, a current efficiency of 70.10%, and an energy balance ratio of 0.66 were obtained at 0.250 mol L –1 of Na 2 SO 4 . Numerical results indicated that an increase in Na 2 SO 4 concentration caused severe concentration polarization that resisted NH 4 + migration in the CEM. The DFT results demonstrated that competitive adsorption of Na + to the CEM hindered NH 4 + migration. The weaker interacting force between NH 4 + and the sulfonate functional group (−SOH 3 ) in comparison to that between Na + and −SOH 3 might be related to the geometric and orientation effects, which generated an additional energy barrier for NH 4 + transport. Therefore, this study suggests that the supporting electrolyte concentration should be matched with that of the desalted ions.

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Section: Discussionmentioning

confidence: 99%

Ammonia Recovery from Wastewater as a Fuel: Effects of Supporting Electrolyte on Ammonium Permeation through a Cation-Exchange Membrane

Liu

et al. 2022

ACS Omega

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“…Meanwhile, high-level radioactive wastes are usually disposed of in a way of deep geological disposal (Grambow, 2008). After long-term storage, the disposal facility will eventually be damaged, which will further cause the migration of the radionuclides by groundwater into the surrounding rock medium (Wang et al, 2005;Vanloon et al, 2012). However, for the long-term effective isolation of radioactive wastes, pyrite and magnetite, existing widely and stably in the geological environment, have been considered to reduce the strong mobility of high-valence redox-sensitive radionuclides (U, Se, Tc, and Np) to a lowvalence state with a weak mobility state to make these lowvalence radionuclides adhere to the surrounding rock medium (Bruggeman et al, 2002;Bruggeman et al, 2005;Eglizaud et al, 2006;Naveau et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Prevention of radioactive pollution: A comparative simulation study on the reduction of several important radionuclides by pyrite and magnetite

Chen

Zeng

2022

Front. Environ. Sci.

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In order to ensure the long-term effective isolation of radionuclides from human beings to the environment, pyrite and magnetite, which exist widely and stably in the geological environment, can be considered to reduce the strong mobility of high-valence redox-sensitive nuclides to the low-valence nuclides with low mobility. In this work, the reducing reaction between pyrite, magnetite, and redox-sensitive radionuclides (U, Se, Tc, and Np) in the Gansu proposed-treatment plant area was under simulation by PHREEQC. Due to the considerable existence of quartz and calcite in the Gansu proposed-treatment plant area surrounding the rock of interest, the influence of the dissolved Ca2+ and SiO32- should be taken into account. The corresponding precipitation saturation index of the complex (UOX, Se(s), and TcO2) and species of interest was calculated, and the results suggested that pyrite can significantly reduce the high-valence radionuclides (U, Se, Tc, and Np), and their corresponding precipitation saturation indexes (SIs) were usually positive. However, magnetite, in a given condition, showed a certain reducing effect against Se and Np and a poor effect on U and Tc. It was worth noting that the aqueous pH in the system always remained constant because of the CO2 partial pressure of the underground biosphere under this long-term time scale. These conclusions have an important guiding significance for the prevention and retention of radioactive pollution released into the biological environment.

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Simulation of non-linear heterogeneity-based isotherms for characterizing anaerobic and aerobic sorption of Se and Cs on various clay rocks

et al. 2021

J Radioanal Nucl Chem

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Studying radionuclide migration on different scales: the complementary roles of laboratory and in situ experiments

Cited by 5 publications

References 112 publications

Ammonia Recovery from Wastewater as a Fuel: Effects of Supporting Electrolyte on Ammonium Permeation through a Cation-Exchange Membrane

Ammonia Recovery from Wastewater as a Fuel: Effects of Supporting Electrolyte on Ammonium Permeation through a Cation-Exchange Membrane

Prevention of radioactive pollution: A comparative simulation study on the reduction of several important radionuclides by pyrite and magnetite

Simulation of non-linear heterogeneity-based isotherms for characterizing anaerobic and aerobic sorption of Se and Cs on various clay rocks

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