Study on Microbial Cure and Stabilization Effect and Mechanisms of Zinc-Contaminated Silt

XING Wei; ZHOU Feng; ZHU Rui; CHEN Tingzhu

doi:10.3724/j.gyjzG23031904

Volume 54 Issue 9

Sep. 2024

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XING Wei, ZHOU Feng, ZHU Rui, CHEN Tingzhu. Study on Microbial Cure and Stabilization Effect and Mechanisms of Zinc-Contaminated Silt[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 32-42. doi: 10.3724/j.gyjzG23031904

Citation:

XING Wei, ZHOU Feng, ZHU Rui, CHEN Tingzhu. Study on Microbial Cure and Stabilization Effect and Mechanisms of Zinc-Contaminated Silt[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 32-42. doi: 10.3724/j.gyjzG23031904

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Study on Microbial Cure and Stabilization Effect and Mechanisms of Zinc-Contaminated Silt

doi: 10.3724/j.gyjzG23031904

XING Wei¹,
ZHOU Feng¹,
ZHU Rui^{1,2,3
,
,},
CHEN Tingzhu⁴

1. College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China;
2. Key Laboratory of Geohazard Fujian Province, Fuzhou 350002, China;
3. National Key Laboratory of Water Disaster Prevention, Nanjing Hydaulic Research Institute, Nanjing 210029, China;
4. Nanjing Jiangbei Construction Engineering Co., Ltd., Nanjing 210031, China

Received Date: 2023-03-19
Available Online: 2024-10-18

Abstract

Abstract

With the rapid development of industry, the problem of soil contaminated by heavy metals, represented by Zn, has been becoming more and more prominent, and it is important to study the treatment methods and cured effects on Zn-contaminated silt. Based on the microbial induced calcium carbonate precipitation (MICP) technique, a series of indoor experiments on microbial-cemented Zn-contaminated soil were conducted to reveal the mechanism of microbial cementation of Zn-contaminated soil from the perspective of microstructural evolution. The results showed that microbial mineralization significantly improved the mechanical properties of Zn-contaminated soil, and reduced the permeability coefficient of Zn-contaminated soil by an order of magnitude, significantly reduced the leaching concentration of Zn ions and the percentage of the exchangeable Zn content. It mainly might produce calcite crystals with colloidal properties during the microbial mineralization process, and zinc ions were fixed and tranfered to zinc carbonate, which made the microbial-cemented Zn-contaminated soil achieve the dual objectives of contaminant control and strength enhancement simultaneously. The microbial cure and stabilization of Zn-contaminated silt were most effective when the cementitious solution concentration was 1 mol/L, the cementitious solution ratio (CaCl₂∶Urea) was 1∶2, and the curing age was 28 d.
- MICP,
- Zn-contaminated soil,
- cure effect,
- toxic leaching,
- microstructure

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References(38)

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