Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests
Drought is a serious global environmental issue that causes water resource scarcity and threatens agriculture and food supplements. This study aims to investigate the long-term performance of an eco-friendly technique-microbial induced carbonate precipitation (MICP) on drought mitigation at field an...
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sg-ntu-dr.10356-1816042024-12-13T15:34:30Z Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests Ji, Xin-Lun Tang, Chao-Sheng Pan, Xiao-Hua Cai, Zhao-Lin Liu, Bo Wang, Dian-Long School of Civil and Environmental Engineering Engineering Drought mitigation Field-scale test Drought is a serious global environmental issue that causes water resource scarcity and threatens agriculture and food supplements. This study aims to investigate the long-term performance of an eco-friendly technique-microbial induced carbonate precipitation (MICP) on drought mitigation at field and laboratory scales. Seven in-situ slopes treated with different MICP rounds and cementation solution concentrations were subjected to 16-month weathering. Tests were conducted to evaluate the evaporation characteristics, water retention capacity, and CaCO3 distribution. Laboratory soil samples were further prepared to provide evidence related to underlying weathering mechanisms. The results show that MICP has a time-dependent performance on drought mitigation. After MICP treatment, soil performs a remarkable evaporation suppression ability and the evaporation rate can decrease by 50%. This is attributed to the soluble salts which increase soil water retention capability and dense hard crust which inhibits water vapor migration into the atmosphere. However, the soluble salts and crust are sensitive to weathering thus leading to degradation of MICP. Suffering 16-month weathering, the MICP-induced CaCO3 decreases by more than 60%. The evaporation rate of soil increases with MICP rounds and cementation solution concentrations and can reach nearly two times of untreated soil. MICP-treated field soil exhibits weaker water retention capacity than untreated soil because MICP alters soil microstructure which expands macropores and decreases volume of micropores. Connected macropores act as favorable evaporation channels and accelerate evaporation. To ensure MICP long-term effects, periodical treatments are necessary. The most effective MICP treatment scheme is four to six treatment rounds and 1.0 M cementation solution. Published version This work was supported by the National Natural Science Foundation of China (Grant 41925012, 42230710), National Key Research and Development Program of China (Grant 2023YFC3707900), Key task project for joint research and development of the Yangtze River Delta Science and Technology Innovation Community (Grant 2022CSJGG1200), and Natural Science Foundation of Jiangsu Province (Grant BK20211087). 2024-12-10T06:51:28Z 2024-12-10T06:51:28Z 2024 Journal Article Ji, X., Tang, C., Pan, X., Cai, Z., Liu, B. & Wang, D. (2024). Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests. Water Resources Research, 60(7). https://dx.doi.org/10.1029/2024WR037486 0043-1397 https://hdl.handle.net/10356/181604 10.1029/2024WR037486 2-s2.0-85198536976 7 60 en Water Resources Research © 2024. The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. application/pdf |
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Engineering Drought mitigation Field-scale test Ji, Xin-Lun Tang, Chao-Sheng Pan, Xiao-Hua Cai, Zhao-Lin Liu, Bo Wang, Dian-Long Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
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Drought is a serious global environmental issue that causes water resource scarcity and threatens agriculture and food supplements. This study aims to investigate the long-term performance of an eco-friendly technique-microbial induced carbonate precipitation (MICP) on drought mitigation at field and laboratory scales. Seven in-situ slopes treated with different MICP rounds and cementation solution concentrations were subjected to 16-month weathering. Tests were conducted to evaluate the evaporation characteristics, water retention capacity, and CaCO3 distribution. Laboratory soil samples were further prepared to provide evidence related to underlying weathering mechanisms. The results show that MICP has a time-dependent performance on drought mitigation. After MICP treatment, soil performs a remarkable evaporation suppression ability and the evaporation rate can decrease by 50%. This is attributed to the soluble salts which increase soil water retention capability and dense hard crust which inhibits water vapor migration into the atmosphere. However, the soluble salts and crust are sensitive to weathering thus leading to degradation of MICP. Suffering 16-month weathering, the MICP-induced CaCO3 decreases by more than 60%. The evaporation rate of soil increases with MICP rounds and cementation solution concentrations and can reach nearly two times of untreated soil. MICP-treated field soil exhibits weaker water retention capacity than untreated soil because MICP alters soil microstructure which expands macropores and decreases volume of micropores. Connected macropores act as favorable evaporation channels and accelerate evaporation. To ensure MICP long-term effects, periodical treatments are necessary. The most effective MICP treatment scheme is four to six treatment rounds and 1.0 M cementation solution. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Ji, Xin-Lun Tang, Chao-Sheng Pan, Xiao-Hua Cai, Zhao-Lin Liu, Bo Wang, Dian-Long |
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Ji, Xin-Lun Tang, Chao-Sheng Pan, Xiao-Hua Cai, Zhao-Lin Liu, Bo Wang, Dian-Long |
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Ji, Xin-Lun |
title |
Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
title_short |
Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
title_full |
Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
title_fullStr |
Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
title_full_unstemmed |
Long‐term performance on drought mitigation of soil slope through bio‐approach of MICP: evidence and insight from both field and laboratory tests |
title_sort |
long‐term performance on drought mitigation of soil slope through bio‐approach of micp: evidence and insight from both field and laboratory tests |
publishDate |
2024 |
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https://hdl.handle.net/10356/181604 |
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1819112951260381184 |