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
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)
Article
Environmental Sciences
Mohammad Mirshahmohammad, Hamid Rahmani, Mahdi Maleki-Kakelar, Abbas Bahari
Summary: Different biological methods were studied to repair concrete cracks, and it was found that adding bacterial nutrients to the concrete significantly improved its mechanical properties and self-healing characteristics, reducing the healing time.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geochemistry & Geophysics
Y. Ge
Summary: Extensive early marine cementation at the seafloor has important environmental implications and its driving factors are still controversial. This study investigates multiple factors involved in early marine cementation based on analysis of the Abu Dhabi coastal area in the Persian Gulf. The results suggest that factors such as CaCO3 saturation, saturation gradient, higher sea level, and the formation of shallow redox boundary contribute to extensive early marine cementation.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Inna V. Zamulina, Andrey V. Gorovtsov, Tatiana M. Minkina, Saglara S. Mandzhieva, Tatiana V. Bauer, Marina V. Burachevskaya
Summary: This study found that copper and zinc have a significant impact on soil organic matter and enzyme activity, with WSOM extracted with cold water being sensitive to their interactions and posing potential environmental risks.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Lin Wang, Wen-Chieh Cheng, Zhong-Fei Xue, Yi-Xin Xie, Xin-Jiang Lv
Summary: A novel electrokinetic (EK) reactor was proposed in this study for remediating Cu and Pb contaminated loess. By deploying a biological permeable reactive barrier (bio-PRB) in the middle of the EK reactor, the removal efficiency of Cu and Pb was improved and the focusing phenomenon was reduced.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Multidisciplinary Sciences
Olivier Sulpis, Priyanka Agrawal, Mariette Wolthers, Guy Munhoven, Matthew Walker, Jack J. Middelburg
Summary: Research suggests that a deep-sea carbonate version of galvanization, where aragonite sacrifies itself to protect calcite, could explain the predominance of calcite over aragonite in marine sediments. The dissolution of aragonite at the seafloor provides alkalinity that buffers the deep ocean and favors the preservation of less soluble calcite. However, the proposed galvanizing effect of aragonite may weaken in the future due to ocean acidification.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Qizhi Hu, Zekai Wang
Summary: This study investigated the solidification effect of different calcium sources on crushed silty clay using microbial solidification technology. The results showed that the solidification strength decreased gradually with the increase in concentration when using calcium chloride and calcium acetate to solidify the clay. However, calcium gluconate at a concentration of 1.0 mol/L exhibited the highest solidification strength.
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
Environmental Sciences
Marina D. Kravchishina, Alla Yu Lein, Mikhail V. Flint, Boris V. Baranov, Alexey Yu Miroshnikov, Elena O. Dubinina, Olga M. Dara, Alexander. S. Savvichev, Andrey G. Boev
Summary: The study reveals the presence of pure carbonate crusts in the Siberian Arctic seafloor, with high-Mg calcite being the main component, proving the formation of seep carbonate and elucidating its genesis.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Mingyue Wu, Xiangming Hu, Qian Zhang, Yanyun Zhao, Weimin Cheng, Di Xue
Summary: A biological dust suppressant was developed through a synergistic effect of surfactant and enzyme-induced carbonate precipitation to control dust pollution from open-pit coal mining. Experimental results showed that the dust suppressant significantly improved wind erosion resistance of coal dust.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Multidisciplinary Sciences
Changyu Jin, Huiyang Liu, Mingxiao Guo, Yunfeng Wang, Jinyao Zhu
Summary: This paper proposes a method of tailings cementation using the microbial induced calcite precipitation (MICP) technique with immersion curing. The results indicate that it is an effective method for tailings cementation.
Article
Environmental Sciences
Xinwei Xiong, Yanfei Cao, Zhixin Li, Ronglian Huang, Yu Jiao, Liqiang Zhao, Xiaodong Du, Zhe Zheng
Summary: This study identified specific tyrosinases (NLSTyr) involved in nacre formation in pearl oysters, which inhibited calcium carbonate precipitation and affected crystal morphologies. These findings provide new insights into the evolution and function of tyrosinase in mollusks.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Nattapong Yamasamit, Panisa Sangkeaw, Wittaya Jitchaijaroen, Chanachai Thongchom, Suraparb Keawsawasvong, Viroon Kamchoom
Summary: This research investigates the effectiveness of Bacillus subtilis (B. subtilis) in self-healing cracks in concrete and enhancing concrete strength through microbial induced calcium carbonate precipitation (MICP). The study evaluates the ability of the mortar to cover cracks within 28 days, taking into account the width of the crack, and observes the recovery of strength after self-healing. The use of microencapsulated endospores of B. subtilis is also examined for its impact on the strength of concrete. Compressive, splitting tensile, and flexural strengths are compared between normal mortar and biological mortar, and it is found that biological mortar has a higher strength capacity. Microstructure analysis using SEM and EDS shows that bacterial growth increases calcium production, contributing to the improved mechanical properties of the bio-mortar.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Environmental
Zhimeng Su, Zelan Deng, Yazhi Wang, Chen Ji, Fuchun Li, Guoguo Yang, Lingjie Huang
Summary: This study investigated the effect of Sr/Ca ratio on microbially-induced carbonate precipitation and found that a higher Sr/Ca ratio promoted Sr incorporation into minerals. The removal of Sr2+ was positively correlated with mass of CO32- in the mineral. Chemical induction experiments showed that Sr2+ removal was positively correlated with the distribution coefficient of Sr. These findings have reference value for understanding the formation mechanism of carbonate minerals and Sr bioremediation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)