GEP  Vol.8 No.7 , July 2020
Pilot Test of the Permeable Reactive Barrier for Removing Uranium from the Flooded Gunnar Pit
Abstract: This work reports on applying iron oxide coated sand (IOCS) media in an experimental permeable reactive barrier to remove uranium (U) species from uranium containing water. A field study was conducted at the legacy Gunnar uranium mine & mill site that was abandoned in the 1960s with limited to no decommissioning. The flooded Gunnar mine pit presently contains about 3.2 million m3 of water contaminated by dissolved U (1.2 mg/L), Ra-226 (0.4 Bq/L), and minor concentrations of other contaminants (As, Se, etc.). The water is seeping over the pit rim into Lake Athabasca, posing potential environmental and health concerns. IOCS media can be used to immobilize uranium species through an adsorption process. Herein, the preparation of hydrous ferric oxide sorbents and their supported forms onto silica sands is described. Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (pXRD) were used for structural characterization. The adsorption properties of the IOCS sorbent media were modeled by the Langmuir adsorption isotherm, where a maximum uranium uptake capacity was estimated. Bench-scale adsorption kinetic experiments were also performed before moving to a field trial. Based on these lab results and input on field-scale parameters, a pilot permeable reactive barrier was fabricated and a field test conducted near the Gunnar pit in June 2019. This pilot test provided technical data and information needed for designing a full-scale permeable barrier that employs the IOCS media. This approach can be applied for in-situ water treatment at Gunnar and other legacy uranium sites.
Cite this paper: Kong, D. , McGilp, L. , Klyashtorin, A. , Wilson, I. and Wilson, L. (2020) Pilot Test of the Permeable Reactive Barrier for Removing Uranium from the Flooded Gunnar Pit. Journal of Geoscience and Environment Protection, 8, 155-176. doi: 10.4236/gep.2020.87009.

[1]   Benjamin, M. M., Sletten, R. S., Bailey, R. P., & Bennett, T. (1996). Sorption and Filtration of Metals Using Iron-Oxide-Coated Sand. Water Research, 30, 2609-2620.

[2]   Cornell, R. M., & Schwertmann, U. (2003). The Iron Oxides: Structure, Properties, Reactions, Occurences and Uses. Weinheim: Wiley-VCH GmbH& Co. KGaA.

[3]   Han, R. (2009). Adsorption of Methylene Blue by Phoenix Tree Leaf Powder in a Fixed-Bed Column: Experiments and Prediction of Breakthrough Curves. Desalination, 245, 284-297.

[4]   Hubbe, M. A., Beck, K. R., O’Neal, W. G., & Sharma, Y. C. (2012). Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. BioResources, 9, 5951-5962.

[5]   Jung, K. W., Kim, J. M., Kim, C. J., & Lee, J. M. (1987). Trace Analysis of Uranium in Aqueous Samples by Laser-Induced Fluorescence Spectroscopy. Journal of the Korean Nuclear Society, 19, 242-248.

[6]   Khan, M. N., & Sarwar, A. (2007). Determination of Point of Zero Charge of Natural and Treated Adsorbents. Surface Review and Letters, 14, 461-469.

[7]   Mahaninia, M., & Wilson, L. (2017). A Kinetic Uptake Study of Roxarsone Using Cross-Linked Chitosan. Industrial & Engineering Chemistry Research, 56, 1704-1712.

[8]   Markich, S. J. (2002). Uranium Speciation and Bioavailability in Aquatic Systems: An Overview. The Scientific World Journal, 2, 707-729.

[9]   Marshall, T. A., Morris, K., Law, G. T. W., Livens, F. R., Mosselmans, J. F. W., Bots, P., & Shaw, S. (2014). Incorporation of Uranium into Hematite during Crystallization from Ferrihydrite. Environmental Science & Technology, 48, 3724-3731.

[10]   Muldoon, J., & Schramm, L. L. (2009). Gunnar Uranium Mine Environmental Remediation—Northern Saskatchewan. In the 12th International Conference on Environmental Remediation and Radioactive Waste Management (pp. 1-12). Liverpool: ICEM2009.

[11]   Muldoon, J., Yankovich, T., & Schramm, L. L. (2013). Gunnar Uranium Mine Environmental Remediation—Northern Saskatchewan. In International Conference on Environmental Remediation and Radioactive Waste Management (pp. 1-10). Brussels: ICEM2013.

[12]   Nwabanne, J. T., & Igbokwe, P. K. (2012). Adsorption Performance of Packed Bed Column for the Removal of Lead (II) Using Oil Palm Fibers. International Journal of Applied Science and Technology, 2, 106-115.

[13]   Rusch, B., Hanna, K., & Humbert, B. (2010). Coating of Quartz Silica with Iron Oxides: Characterization and Surface Reactivity of Iron Coating Phases. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 353, 172-180.

[14]   Schwertmann, U., & Cornell, R. M. (2000). Iron Oxides in the Laboratory. Chichester: Wiley.

[15]   Sheng, L., & Fein, J. B. (2014). Uranium Reduction by Shewanella oneidensis MR-1 as a Function of NaHCO3 Concentration: Surface Complexation Control of Reduction Kinetics. Environmental Science & Technology, 48, 3768-3775.

[16]   Sherman, D. M., Peacock, C. L., & Hubbard, C. G. (2008). Surface Complexation of U(VI) on Goethite (a-FeOOH). Geochimica et Cosmochimica Acta, 72, 298-310.

[17]   Udoetok, I. A., Dimmick, R. M., Wilson, L. D., & Headley, J. V. (2016). Adsorption Properties of Cross-Linked Cellulose-Epichlorohydrin Polymers in Aqueous Solution. Carbohydrate Polymers, 136, 329-340.

[18]   Xiong, W., & Peng, J. (2008). Development and Characterization of Ferrihydrite-Modified Diatomite as a Phosphorus Adsorbent. Water Research, 42, 4869-4877.