Hydrothermal Desorption of Cs with Oxalic Acid from Hydrobiotite and Wastewater Treatment by Chemical Precipitation
| Autor: | June-Hyun Kim, Ilgook Kim, Sung-Man Kim, So-Jin Park, In-Ho Yoon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
chemical precipitation
Control and Optimization Metal ions in aqueous solution Oxalic acid Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences lcsh:Technology Hydrothermal circulation oxalic acid chemistry.chemical_compound Adsorption Desorption cesium Electrical and Electronic Engineering Engineering (miscellaneous) 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment lcsh:T hydrobiotite (HBT) 021001 nanoscience & nanotechnology wastewater treatment chemistry Wastewater Caesium Sodium tetraphenylborate 0210 nano-technology Energy (miscellaneous) Nuclear chemistry |
| Zdroj: | Energies; Volume 13; Issue 12; Pages: 3284 Energies, Vol 13, Iss 3284, p 3284 (2020) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13123284 |
| Popis: | A hydrobiotite (HBT) clay contains more cesium (Cs)‐specific adsorption sites than illitic clay, and the capacity of frayed edge sites can increase as the weathering of micaceous minerals proceeds. Thus, Cs can be selectively adsorbed to HBT clay. In this study, we investigated the removal efficiency of non-radioactive (133Cs) and radioactive (137Cs) Cs from HBT, using oxalic acid. We found the minimum optimal concentration of 0.15 M oxalic acid removed more than 90% of Cs. Subsequently, cations and Cs ions were removed using Ca(OH)2 and sodium tetraphenylborate (NaTPB) to treat the washing wastewater generated at the optimum concentration of the desorbent (0.15 M oxalic acid). In order to remove cations and heavy metal ions in the waste solution, Ca(OH)2 was treated at a mass ratio of 0.025 g/mL and pH 9–10 to derive optimal conditions. As a final step, to remove Cs, NaTPB was treated with a mass ratio of 2 mg/mL and reduced to below 0.1 mg/L Cs to find the optimal dose. The novelty of this study is that the amount of radioactive waste can be drastically reduced by removing the non-radioactive cations and heavy metals separately in the first step and removing the remaining radioactive Cs in the second step. |
| Databáze: | OpenAIRE |
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