Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process
Objectives Secondary wastewater is generated as the soil washing process proceeds to restore contaminated soil near the nuclear power plants (NPPs). In this study, we tried to evaluate the possibility of removing radioactive cesium from secondary wastewater through the adsorption process using illi...
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| Format: | Article |
| Language: | English |
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Korean Society of Environmental Engineers
2020-08-01
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| Series: | 대한환경공학회지 |
| Subjects: | |
| Online Access: | http://jksee.or.kr/journal/view.php?number=4274 |
| _version_ | 1818526393458229248 |
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| author | Juhyeok Lee Jaeeun Kang Won-Seok Kim |
| author_facet | Juhyeok Lee Jaeeun Kang Won-Seok Kim |
| author_sort | Juhyeok Lee |
| collection | DOAJ |
| description | Objectives
Secondary wastewater is generated as the soil washing process proceeds to restore contaminated soil near the nuclear power plants (NPPs). In this study, we tried to evaluate the possibility of removing radioactive cesium from secondary wastewater through the adsorption process using illite.
Methods
To treat radioactive cesium present in wastewater, as an adsorbent, we used illite collected from Yeongdong, Chungbuk, and weathering illite artificially weathered by high temperature and acid treatment (60℃, 0.01 M HCl). Before and after weathering, the adsorption rate of illite at low concentrations of cesium and the desorption rate of adsorbents were compared and evaluated using a 1.5 ppm of competitive potassium ion similar to that of groundwater.
Results and Discussion
When the illite was artificially weathered, the amount of frayed edge sites increased as the interlayer ions in the illite eluted. As a result of the adsorption and desorption experiments, it was confirmed that the adsorption rate of weathering illite increased by about 11% in acid condition (pH 3) and about 26% in neutral condition (pH 6.2), and the desorption rate of weathering illite decreased by about 6% in acid and neutral conditions, compared to Yeongdong illite. Yeongdong illite and weathering illite showed higher adsorption rate under neutral condition than acidic condition, because the surface of the illite became negatively charged at high pH so the reactivity with cesium present as a cation increased.
Conclusions
The artificial weathering process has improved the performance of illite as an adsorbent. We expect that weathering illite can be used as an effective adsorbent for the removal of radioactive cesium from NPP. |
| first_indexed | 2024-12-11T06:22:23Z |
| format | Article |
| id | doaj.art-9d77edf5129b48fcb37f49356a39928e |
| institution | Directory Open Access Journal |
| issn | 1225-5025 2383-7810 |
| language | English |
| last_indexed | 2024-12-11T06:22:23Z |
| publishDate | 2020-08-01 |
| publisher | Korean Society of Environmental Engineers |
| record_format | Article |
| series | 대한환경공학회지 |
| spelling | doaj.art-9d77edf5129b48fcb37f49356a39928e2022-12-22T01:17:46ZengKorean Society of Environmental Engineers대한환경공학회지1225-50252383-78102020-08-0142840541310.4491/KSEE.2020.42.8.405Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing ProcessJuhyeok Lee0https://orcid.org/0000-0002-9373-8084Jaeeun Kang1https://orcid.org/0000-0003-0604-5632Won-Seok Kim2https://orcid.org/0000-0003-3929-3720Division of Advanced Nuclear Engineering, Pohang University of Science and TechnologyDivision of Advanced Nuclear Engineering, Pohang University of Science and TechnologyDivision of Advanced Nuclear Engineering, Pohang University of Science and TechnologyObjectives Secondary wastewater is generated as the soil washing process proceeds to restore contaminated soil near the nuclear power plants (NPPs). In this study, we tried to evaluate the possibility of removing radioactive cesium from secondary wastewater through the adsorption process using illite. Methods To treat radioactive cesium present in wastewater, as an adsorbent, we used illite collected from Yeongdong, Chungbuk, and weathering illite artificially weathered by high temperature and acid treatment (60℃, 0.01 M HCl). Before and after weathering, the adsorption rate of illite at low concentrations of cesium and the desorption rate of adsorbents were compared and evaluated using a 1.5 ppm of competitive potassium ion similar to that of groundwater. Results and Discussion When the illite was artificially weathered, the amount of frayed edge sites increased as the interlayer ions in the illite eluted. As a result of the adsorption and desorption experiments, it was confirmed that the adsorption rate of weathering illite increased by about 11% in acid condition (pH 3) and about 26% in neutral condition (pH 6.2), and the desorption rate of weathering illite decreased by about 6% in acid and neutral conditions, compared to Yeongdong illite. Yeongdong illite and weathering illite showed higher adsorption rate under neutral condition than acidic condition, because the surface of the illite became negatively charged at high pH so the reactivity with cesium present as a cation increased. Conclusions The artificial weathering process has improved the performance of illite as an adsorbent. We expect that weathering illite can be used as an effective adsorbent for the removal of radioactive cesium from NPP.http://jksee.or.kr/journal/view.php?number=4274radioactive cesiumilliteartificial weatheringadsorptiondesorption |
| spellingShingle | Juhyeok Lee Jaeeun Kang Won-Seok Kim Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process 대한환경공학회지 radioactive cesium illite artificial weathering adsorption desorption |
| title | Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process |
| title_full | Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process |
| title_fullStr | Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process |
| title_full_unstemmed | Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process |
| title_short | Removal of Radioactive Cesium in Secondary Wastewater after Soil-washing Process |
| title_sort | removal of radioactive cesium in secondary wastewater after soil washing process |
| topic | radioactive cesium illite artificial weathering adsorption desorption |
| url | http://jksee.or.kr/journal/view.php?number=4274 |
| work_keys_str_mv | AT juhyeoklee removalofradioactivecesiuminsecondarywastewateraftersoilwashingprocess AT jaeeunkang removalofradioactivecesiuminsecondarywastewateraftersoilwashingprocess AT wonseokkim removalofradioactivecesiuminsecondarywastewateraftersoilwashingprocess |