Sustainability of humic acids in the presence of magnesium oxide |
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| Institution: | 1. Laboratory for Mechanistic Chemistry of Biomolecules, Department of Chemistry, Japan;2. Center for Biosciences and Informatics, Keio University, Yokohama 223-8522, Japan;3. CREST (Core Research for Evolutionary Science and Technology), JST, Tokyo 102-0076, Japan;4. Laboratory for Molecular Mechanisms of Thalamus Development, RIKEN Brain Science Institute, Saitama 351-0198, Japan;5. Department of Neuroscience for Neurodegenerative Disorders, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan;1. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CONICET, Facultad de Ciencias Exactas, Departamento de Química, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina;2. Facultad de Ingeniería, Universidad Nacional de La Plata, Calle 47 y 1, 1900 La Plata, Argentina;1. EA 4297, Université de Technologie de Compiègne, Rue Roger Coutollenc, CS 60319, 60203 Compiègne Cedex, France;2. INERIS, DRC-TPPD, Parc Technologique Alata BP2, 60550 Verneuil en Halatte Cedex, France |
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| Abstract: | The Waste Isolation Pilot Plant (WIPP) is a U.S. Department of Energy (DOE) repository for the disposal of transuranic waste generated from the U.S. defense program. Humic acids (HA), known to strongly bind to actinides and which may be generated by the degradation of organic materials present in the waste, may influence the performance of the WIPP. This work presents experimental results on the effect of WIPP brines, ERDA-6 and GWB, and of the WIPP engineered barrier, Premier Chemicals magnesium oxide, on the solubility of HA. In the absence of MgO, a portion of HA initially precipitates, but a constant concentration of HA remains in solution: over a 60 day period of time, at least 290 ± 10 mg/L HA can remain soluble in de-ionized (DI) water, 30 ± 4 mg/L in 95% ERDA-6, and 31 ± 4 mg/L in 95% GWB. For solutions initially containing from 0 to 400 mg/L HA, the ratio of the initial HA concentration and the soluble HA concentration is 1.3 in DI water, 13 in 95% ERDA-6, and 11 in 95% GWB. In the presence of MgO, all HA precipitate within 60 days in systems with a high liquid-to-solid ratio (10.0 g/g) or a low ratio (2.4 g/g). This phenomenon is due to HA precipitation and/or sorption on the surface of MgO. |
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