Technetium-99 Removal from Process Solutions and Contaminated Groundwater
| Autor: | G. D. Del Cul, D. R. Trotter, P.E. Osborne, W. D. Bostick |
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| Rok vydání: | 1993 |
| Předmět: |
Packed bed
Process Chemistry and Technology General Chemical Engineering chemistry.chemical_element Filtration and Separation General Chemistry Human decontamination Raffinate Uranium Dilution chemistry.chemical_compound chemistry Nitric acid Environmental chemistry Gaseous diffusion Groundwater Nuclear chemistry |
| Zdroj: | Separation Science and Technology. 28:551-564 |
| ISSN: | 1520-5754 0149-6395 |
| Popis: | The predominant form of technetium under oxic conditions is the pertechnetate anion (TcO4 −), which is highly soluble in water and readily mobile in the environment. Technetium-99 is of particular concern because of its persistence and mobility. Various equipment decontamination and uranium recovery operations at the Portsmouth Gaseous Diffusion Plant generate a “raffinate” waste stream characterized by toxic heavy metals, high concentration of nitric acid, and low levels of radionuclides (235u and 99Tc). Dilution and adjustment of solution pH to a value of 8.2 to 8.5 precipitates a heavy-metals-sludge and a filtrate. The removal of 99Tc from these waste streams and from contaminated groundwater can be accomplished using anionic ion-exchange resins. Batch equilibrium and packed column breakthrough and regeneration studies were performed using inorganic sorbenta and organic ion-exchange resins (Dowex SRB-OH and Reillex resins). These studies were performed on actual and surrogate raw raffinates, f... |
| Databáze: | OpenAIRE |
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