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| Speciation characteristics and risk evaluation of heavy metals solidified by MICP under improved perfusion methods |
| TANG Yu1,2,3, FU Jun1,4,5, CHEN An1,2,3, ZHOU Han1,4,5, ZHANG Yu1,2,3, LUO Lei1,2,3 |
1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Key Laboratory of Geohazard Forecast and Geoecological Restoration in Plateau Mountainous Area, Ministry of Natural Resources of the People's Republic of China, Kunming 650093, China;
3. Yunnan Key Laboratory of Geohazard Forecast and Geoecological Restoration in Plateau Mountainous Area, Kunming 650093, China;
4. Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co. Ltd, Kunming 650051, China;
5. Yunnan Provincial Key Laboratory of Geotechnical Engineering and Geological Hazards, Kunming 650051, China |
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Abstract This paper investigated the application of an improved perfusion method for microbial-induced calcium carbonate precipitation (MICP) technology in the solidification of heavy metals. Bacillus pasteurii was employed as the urease-engineered bacterium, and a 0.5cm diameter channel filled with pebbles and wire mesh was constructed to facilitate the injection treatment of industrial solid waste tailings. The migration behavior of heavy metals in the tailings was examined, the mechanisms of MICP solidification were analyzed, and a risk assessment was conducted. The results indicated that, following MICP treatment, the migration factors (MF) of Cu, Pb, and Cd in the tailings were significantly reduced by 78.94%, 61.88%, and 64.06%, respectively. Calcium carbonate precipitation was formed, filling the tailings model box and significantly increasing the residual fractions of Cu, Pb, and Cd (76.43%~92.48%). Consequently, the environmental risks of Cu, Pb, and Cd were reduced from very high to moderate levels, significantly lowering the pollution risk of the tailings. The improved perfusion method was shown to enhance the diffusion channels of the bacterial solution, increased its contact efficiency with the tailings, promoted rapid calcium carbonate precipitation and solidification, and ensured uniform penetration while avoiding uneven solidification. This study provides a valuable reference for the engineering application of MICP technology in heavy metal pollution remediation.
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Received: 22 August 2024
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Corresponding Authors:
陈安,正高级工程师,373034075@qq.com
E-mail: 373034075@qq.com
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