Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology
Soil desertification and salinization are the main environmental disasters in arid and semi-arid areas. It is of great significance to study the water - salt migration law of saline soil and propose corresponding water- salt regulation and control measures. Microbial-induced calcite precipitation (M...
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KeAi Communications Co., Ltd.
2024-03-01
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| Series: | Biogeotechnics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949929123000554 |
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| author | Xiaorong Wang Chi Li Yanru Shi Zhenguo Zhang Qingguo Chi Panshi Wang |
| author_facet | Xiaorong Wang Chi Li Yanru Shi Zhenguo Zhang Qingguo Chi Panshi Wang |
| author_sort | Xiaorong Wang |
| collection | DOAJ |
| description | Soil desertification and salinization are the main environmental disasters in arid and semi-arid areas. It is of great significance to study the water - salt migration law of saline soil and propose corresponding water- salt regulation and control measures. Microbial-induced calcite precipitation (MICP) technology was proposed to improve saline soil based on salt inhibition, and the water–salt–heat coupling migration law and salt-frost heave deformation law of saline soil before and after improvement were studied using soil column model tests. XR1#, XR2#（Saline-alkali-tolerant mineralization bacteria isolated from saline soil) and Sporosarcina pasteurii were used in the MICP improvement and the effect of XR1# was the best. Under high-temperature evaporation, the water migration change rate, water loss rate, accumulated evaporation amount, and accumulated salt content of the improved soil columns within a depth range of 0–40 cm were reduced by an average of 53.6 %, 47.3 %, 69.5 %, and 40 %, respectively, compared with the untreated soil column. During low-temperature cooling, the characteristics of water-salt migration changed significantly, and the deformation of salt-frost heave decreased significantly. The water-salt content at the freezing point (−4.5 °C) changed from a cliff-like steep drop (untreated saline soil) to a slow decrease at environmental temperature (MICP-treated saline soil), and the amount of water crystallization decreased from 81 % to 56.7 % at −5 °C. At the end of the cooling process, the amount of salt-frost heaving on the surface of the soil columns decreased by an average of 62.7 %. Based on the measured data, a numerical simulation was conducted using the HYDRUS-1D model, which had good reliability and accurately simulated and predicted the law of water-salt migration in saline soil under the conditions of microbial solidification and improvement. MICP technology significantly reduced the change rate of water-salt migration and water evaporation in saline soil, hindered salt accumulation, and reduced salt-frost heave deformation, which effectively improved saline soil. The research results provide an important innovation and theoretical basis for the improvement of saline soil. |
| format | Article |
| id | doaj-art-927daf05a1aa4f84ab23d90e65e6c6a0 |
| institution | OA Journals |
| issn | 2949-9291 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Biogeotechnics |
| spelling | doaj-art-927daf05a1aa4f84ab23d90e65e6c6a02025-08-20T02:33:52ZengKeAi Communications Co., Ltd.Biogeotechnics2949-92912024-03-012110005510.1016/j.bgtech.2023.100055Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technologyXiaorong Wang0Chi Li1Yanru Shi2Zhenguo Zhang3Qingguo Chi4Panshi Wang5College of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; Key Lab. of University of Geological Hazards and Geotechnical Engineering Defense in Sandy, Drought and Cold Regions, Hohhot 010051, China; Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; Key Lab. of University of Geological Hazards and Geotechnical Engineering Defense in Sandy, Drought and Cold Regions, Hohhot 010051, China; Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; College of Resources and Environmental Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; Corresponding author.Inner Mongolia Academy of Science and Technology, Hohhot 010020, ChinaCollege of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaCollege of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, ChinaSoil desertification and salinization are the main environmental disasters in arid and semi-arid areas. It is of great significance to study the water - salt migration law of saline soil and propose corresponding water- salt regulation and control measures. Microbial-induced calcite precipitation (MICP) technology was proposed to improve saline soil based on salt inhibition, and the water–salt–heat coupling migration law and salt-frost heave deformation law of saline soil before and after improvement were studied using soil column model tests. XR1#, XR2#（Saline-alkali-tolerant mineralization bacteria isolated from saline soil) and Sporosarcina pasteurii were used in the MICP improvement and the effect of XR1# was the best. Under high-temperature evaporation, the water migration change rate, water loss rate, accumulated evaporation amount, and accumulated salt content of the improved soil columns within a depth range of 0–40 cm were reduced by an average of 53.6 %, 47.3 %, 69.5 %, and 40 %, respectively, compared with the untreated soil column. During low-temperature cooling, the characteristics of water-salt migration changed significantly, and the deformation of salt-frost heave decreased significantly. The water-salt content at the freezing point (−4.5 °C) changed from a cliff-like steep drop (untreated saline soil) to a slow decrease at environmental temperature (MICP-treated saline soil), and the amount of water crystallization decreased from 81 % to 56.7 % at −5 °C. At the end of the cooling process, the amount of salt-frost heaving on the surface of the soil columns decreased by an average of 62.7 %. Based on the measured data, a numerical simulation was conducted using the HYDRUS-1D model, which had good reliability and accurately simulated and predicted the law of water-salt migration in saline soil under the conditions of microbial solidification and improvement. MICP technology significantly reduced the change rate of water-salt migration and water evaporation in saline soil, hindered salt accumulation, and reduced salt-frost heave deformation, which effectively improved saline soil. The research results provide an important innovation and theoretical basis for the improvement of saline soil.http://www.sciencedirect.com/science/article/pii/S2949929123000554Microbial-induced calcite precipitation (MICP)Saline soilSoil improvementWater-salt transport |
| spellingShingle | Xiaorong Wang Chi Li Yanru Shi Zhenguo Zhang Qingguo Chi Panshi Wang Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology Biogeotechnics Microbial-induced calcite precipitation (MICP) Saline soil Soil improvement Water-salt transport |
| title | Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology |
| title_full | Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology |
| title_fullStr | Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology |
| title_full_unstemmed | Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology |
| title_short | Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology |
| title_sort | improvements in saline soil and the law of water salt transport based on salt inhibition using micp technology |
| topic | Microbial-induced calcite precipitation (MICP) Saline soil Soil improvement Water-salt transport |
| url | http://www.sciencedirect.com/science/article/pii/S2949929123000554 |
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