Article
Engineering, Civil
Liping Zhu, Chaopeng Lang, Bingyan Li, Kejun Wen, Mingdong Li
Summary: The soybean urease induced CaCO3 precipitates (SUICP) showed high conversion rate and desirable morphological characteristics, making it a promising environmentally friendly material for soil improvement and rock fissure sealing.
GEOMECHANICS AND ENGINEERING
(2022)
Article
Environmental Sciences
Meiqi Chen, Sivakumar Gowthaman, Kazunori Nakashima, Satoru Kawasaki
Summary: This study investigates the effect of humic acid (HA) on microbial induced carbonate precipitation (MICP) and reveals that the native species in organic soils are less affected by HA compared to exogenous species. Furthermore, the presence of HA hinders the crystallization process of carbonate, resulting in the formation of fine amorphous precipitates and large aggregated carbonate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geochemistry & Geophysics
Peilin Ye, Feirong Xiao, Shiping Wei
Summary: Microbially induced calcium carbonate precipitation (MICP) by urease-producing fungi has potential applications in harsh environments. In this study, carbonate minerals induced by urease-producing fungi isolated from marine sediments were investigated. The results show that the induced precipitates are composed of calcite and vaterite, with vaterite being thermodynamically unstable and easily decomposing at lower temperatures. The findings provide insights into the mineralization mechanism of urease-producing fungi and their potential applications in environmental engineering.
Article
Engineering, Chemical
Guoqing Shi, Jiamin Qi, Yanming Wang, Sun Liu
Summary: The study explored the use of a biological dust suppressant prepared with Bacillus pasteurii, CaCl2, and urea for the prevention of mine dust, showing effectiveness in wetting coal dust. The highest yield of mineralized products and strongest urease activity were observed at a CaCl2-urea solution concentration of 0.6 mol/L. When the volume ratio of bacterial solution to CaCl2-urea solution was 1:1 and the CaCl2-urea solution was 0.6 mol/L, the best dust suppression effect was achieved, indicating that MICP is a mine dust control technology with strong development prospects.
Article
Microbiology
Laxmi Leeprasert, Duenrut Chonudomkul, Chanita Boonmak
Summary: Microbially induced calcium carbonate precipitation (MICP) is a promising technique for its applications in civil engineering, environmental, and geotechnical fields. This study identified two bacterial isolates, Lysinibacillus fusiformis 5.1 and Lysinibacillus xylanilyticus 4.3, which showed high urease activity and calcium carbonate formation capabilities, making them potential candidates for MICP in engineering applications.
Article
Engineering, Chemical
Guoqing Shi, Jiamin Qi, Guangping Teng, Yanming Wang, Haoyang Shen
Summary: This study investigates the effect and influencing factors of a biological dust suppressant on secondary dust generated by coal dust. The experimental results show that the biological dust suppressant has the best effect on suppressing secondary dust from coal dust with particle size above 200 μm, particularly for lignite.
ADVANCED POWDER TECHNOLOGY
(2022)
Review
Biotechnology & Applied Microbiology
Michael S. Carter, Matthew J. Tuttle, Joshua A. Mancini, Rhett Martineau, Chia-Suei Hung, Maneesh K. Gupta
Summary: The production of traditional concrete requires a significant amount of energy and contributes to a large portion of annual CO2 emissions. Biocement, a building material that utilizes biological structures to bind particles, has the potential to compete with traditional concrete as a more environmentally friendly alternative. This review synthesizes evidence from materials science, microbiology, biochemistry, and cell biology to provide a model for the process of biocement production and suggest areas for further research.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Zisheng Liao, Shijun Wu, Hong Xie, Fanrong Chen, Yongqiang Yang, Runliang Zhu
Summary: Microbial-induced carbonate precipitation (MICP) is a promising technology for immobilizing/remediating heavy metals (HMs) like cadmium (Cd), but the long-term stability of MICP-immobilized HMs, especially in farmland where chemical fertilization is necessary, remains unclear. In this study, MICP treatment was performed on soils contaminated with various Cd compounds, and diammonium phosphate (DAP) was added to explore its impact on the immobilized Cd. The results showed that the addition of DAP could affect the stability of the immobilized Cd, and other treatments such as applying non-ammonium phosphate and adding lime material after soil acidification were also helpful in preventing the release of immobilized Cd.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Physical
Xiaodi Hu, Xiongzheng Fu, Pan Pan, Lirong Lin, Yihan Sun
Summary: This study proposes a strategy by incorporating a pretreatment procedure with the mixing MICP method to further improve the stabilization effect of the soil. The experimental results show that the incorporation of the pretreatment procedure can improve the stabilization effect of the traditional mixing MICP method and significantly increase the compressive strength of the soil.
Article
Environmental Sciences
Xiang -Ming Hu, Jin-Di Liu, Yue Feng, Yan-Yun Zhao, Xu-Wei Wang, Wen-Hao Liu, Ming Zhang, Yu Liu
Summary: This paper proposes a new method of enriching urease-producing microbial communities in seawater in a non-sterile environment to solve the dust problem caused by sandstorms. The dust suppression performance of the enriched microorganisms under different pH conditions was explored. The results showed that the alkaline environment promoted the transformation of CaCO3 to more stable calcite, and the mineralization rate reached its maximum value at pH = 10 on the 7th day.
ENVIRONMENTAL RESEARCH
(2023)
Review
Green & Sustainable Science & Technology
Sheng Wang, Longyang Fang, Malcom Frimpong Dapaah, Qijian Niu, Liang Cheng
Summary: This article provides a comprehensive review on microbial-induced carbonate precipitation (MICP) as an effective approach for remediating heavy metal contamination. It focuses on the characteristics of heavy metals in the treated environment and summarizes experimental results from various heavy metals treated by MICP. Recent advancements, limitations, and future directions for further research and development of the MICP approach are discussed. Overall, the review highlights the potential of MICP as a viable method for heavy metal remediation, offering promising results for the removal of a variety of heavy metal contaminants from contaminated environments.
Article
Environmental Sciences
Min Xu, Jing Ma, Xiao-Hong Zhang, Gang Yang, Lu-Lu Long, Chao Chen, Chun Song, Jun Wu, Peng Gao, Dong-Xing Guan
Summary: The MICP technique utilizes ureolytic bacteria to decompose urea and generate carbonate ions for metal combination. It can remediate heavy metal-contaminated soils while maintaining or improving soil functions, but its efficiency in agricultural soil practical application still needs enhancement.
Article
Engineering, Geological
Meghna Sharma, Neelima Satyam, Krishna R. Reddy
Summary: Microbially induced calcite precipitation (MICP) is a promising technique for geotechnical improvement by using bacteria-induced calcium carbonate precipitation. Experiments showed that treatment with specific bacteria under certain conditions can significantly enhance the strength and reduce the hydraulic conductivity of sandy soils.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Timothy D. Hoffmann, Kevin Paine, Susanne Gebhard
Summary: Microbially induced calcite precipitation (MICP) is a bacterial property that has gained attention for biotechnological applications. By engineering Bacillus subtilis to produce urease, MICP can be induced with increased extracellular pH, enhanced by urease accessory genes, and promoted by biofilm conditions. Modulating cell surface charge had minimal effects, suggesting B. subtilis may have inherently negative charge favorable for MICP. Insights gained can aid in engineering biomineralization for specific applications.
MICROBIAL CELL FACTORIES
(2021)
Article
Geosciences, Multidisciplinary
Chenhao Zhu, Zhiqing Li, Zhongjian Zhang, Yu Zhang, Yingxin Zhou, Jianhong Wang
Summary: The utilization of enzyme-induced calcium carbonate precipitation (EICP) in consolidating aeolian sand has gained attention. Pre-reacting urea and urease before injecting the cementing solution, along with increasing the injection rate, can improve the calcium carbonate content and uniformity. Experimental results show that the efficiency and uniformity of calcium carbonate generation can be enhanced with the method.
FRONTIERS IN EARTH SCIENCE
(2023)
