Solidification of uranium mill tailings by MBS-MICP and environmental implications
Uranium mill tailing ponds (UMTPs) are risk source of debris flow and a critical source of environmental U and Rn pollution. The technology of microbial induced calcium carbonate precipitation (MICP) has been extensively studied on reinforcement of UMTs, while little attention has been paid to the e...
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-10-01
|
| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573322002431 |
| _version_ | 1828175606033940480 |
|---|---|
| author | Qianjin Niu Chunguang Li Zhenzhong Liu Yongmei Li Shuo Meng Xinqi He Xinfeng Liu Wenji Wang Meijiao He Xiaolei Yang Qi Liu Longcheng Liu |
| author_facet | Qianjin Niu Chunguang Li Zhenzhong Liu Yongmei Li Shuo Meng Xinqi He Xinfeng Liu Wenji Wang Meijiao He Xiaolei Yang Qi Liu Longcheng Liu |
| author_sort | Qianjin Niu |
| collection | DOAJ |
| description | Uranium mill tailing ponds (UMTPs) are risk source of debris flow and a critical source of environmental U and Rn pollution. The technology of microbial induced calcium carbonate precipitation (MICP) has been extensively studied on reinforcement of UMTs, while little attention has been paid to the effects of MICP on U & Rn release, especially when incorporation of metakaolin and bacillus subtilis (MBS). In this study, the reinforcement and U & Rn immobilization role of MBS -MICP solidification in different grouting cycle for uranium mill tailings (UMTs) was comprehensively investigated. The results showed that under the action of about 166.7 g/L metakaolin and ∼50% bacillus subtilis, the solidification cycle of MICP was shortened by 50%, the solidified bodies became brittle, and the axial stress increased by up to 7.9%, and U immobilization rates and Rn exhalation rates decrease by 12.6% and 0.8%, respectively. Therefore, the incorporation of MBS can enhance the triaxial compressive strength and improve the immobilization capacity of U and Rn of the UMTs bodies solidified during MICP, due to the reduction of pore volume and surface area, the formation of more crystals general gypsum and gismondine, as well as the enhancing of coprecipitation and encapsulation capacity. |
| first_indexed | 2024-04-12T04:29:53Z |
| format | Article |
| id | doaj.art-4f9986a4430e4cbf9b9147ad5ce8a6f0 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-04-12T04:29:53Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-4f9986a4430e4cbf9b9147ad5ce8a6f02022-12-22T03:47:58ZengElsevierNuclear Engineering and Technology1738-57332022-10-01541036313640Solidification of uranium mill tailings by MBS-MICP and environmental implicationsQianjin Niu0Chunguang Li1Zhenzhong Liu2Yongmei Li3Shuo Meng4Xinqi He5Xinfeng Liu6Wenji Wang7Meijiao He8Xiaolei Yang9Qi Liu10Longcheng Liu11School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR China; China Institute of Atomic Energy, Beiing, 102413, PR China; R&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China, Hengyang, 421001, PR China; Corresponding author. School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR China.School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR China; R&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China, Hengyang, 421001, PR China; Corresponding author. School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR China.School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR China; R&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China, Hengyang, 421001, PR ChinaR&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China, Hengyang, 421001, PR China; School of Nuclear Science and Technology, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaSchool of Nuclear Science and Technology, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, PR ChinaChina Institute of Atomic Energy, Beiing, 102413, PR China; R&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China, Hengyang, 421001, PR China; School of Nuclear Science and Technology, University of South China, Hengyang, 421001, PR ChinaUranium mill tailing ponds (UMTPs) are risk source of debris flow and a critical source of environmental U and Rn pollution. The technology of microbial induced calcium carbonate precipitation (MICP) has been extensively studied on reinforcement of UMTs, while little attention has been paid to the effects of MICP on U & Rn release, especially when incorporation of metakaolin and bacillus subtilis (MBS). In this study, the reinforcement and U & Rn immobilization role of MBS -MICP solidification in different grouting cycle for uranium mill tailings (UMTs) was comprehensively investigated. The results showed that under the action of about 166.7 g/L metakaolin and ∼50% bacillus subtilis, the solidification cycle of MICP was shortened by 50%, the solidified bodies became brittle, and the axial stress increased by up to 7.9%, and U immobilization rates and Rn exhalation rates decrease by 12.6% and 0.8%, respectively. Therefore, the incorporation of MBS can enhance the triaxial compressive strength and improve the immobilization capacity of U and Rn of the UMTs bodies solidified during MICP, due to the reduction of pore volume and surface area, the formation of more crystals general gypsum and gismondine, as well as the enhancing of coprecipitation and encapsulation capacity.http://www.sciencedirect.com/science/article/pii/S1738573322002431Uranium mill tailingsMBS-MICP groutingSolidification mechanismU and Rn immobilization |
| spellingShingle | Qianjin Niu Chunguang Li Zhenzhong Liu Yongmei Li Shuo Meng Xinqi He Xinfeng Liu Wenji Wang Meijiao He Xiaolei Yang Qi Liu Longcheng Liu Solidification of uranium mill tailings by MBS-MICP and environmental implications Nuclear Engineering and Technology Uranium mill tailings MBS-MICP grouting Solidification mechanism U and Rn immobilization |
| title | Solidification of uranium mill tailings by MBS-MICP and environmental implications |
| title_full | Solidification of uranium mill tailings by MBS-MICP and environmental implications |
| title_fullStr | Solidification of uranium mill tailings by MBS-MICP and environmental implications |
| title_full_unstemmed | Solidification of uranium mill tailings by MBS-MICP and environmental implications |
| title_short | Solidification of uranium mill tailings by MBS-MICP and environmental implications |
| title_sort | solidification of uranium mill tailings by mbs micp and environmental implications |
| topic | Uranium mill tailings MBS-MICP grouting Solidification mechanism U and Rn immobilization |
| url | http://www.sciencedirect.com/science/article/pii/S1738573322002431 |
| work_keys_str_mv | AT qianjinniu solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT chunguangli solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT zhenzhongliu solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT yongmeili solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT shuomeng solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT xinqihe solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT xinfengliu solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT wenjiwang solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT meijiaohe solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT xiaoleiyang solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT qiliu solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications AT longchengliu solidificationofuraniummilltailingsbymbsmicpandenvironmentalimplications |