Article
Construction & Building Technology
Mahi Patil, Parishi H. Dalal, Sowmya Shreedhar, Trudeep N. Dave, Kannan K. R. Iyer
Summary: Biostabilization is an emerging environmental friendly stabilization method for improving civil engineering materials/structures. Various microorganisms, enzymes, and nutrient dosages can affect properties like compressive strength, with significant variations in effectiveness observed across different studies. This work discusses factors controlling upscaling of the biostabilization process and its prospective applications in infrastructure projects.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Muhammad Sohail Ashraf, Mansoor Ul Hassan Shah, Awais Bokhari, Mudassir Hasan
Summary: This research utilized the Response Surface Method to optimize the MICP treatment model, reducing the production of effluent ammonia and significantly improving the compressive strength of coastal sand columns. Structural analyses of biocemented columns showed the adsorption of calcium carbonate and nesquehonite crystals on sand grains, and the reduction in urea consumption significantly decreased the production of effluent ammonia during biocementation of coastal sands.
JOURNAL OF CLEANER PRODUCTION
(2021)
Review
Engineering, Geological
Vinicius Luiz Pacheco, Lucimara Bragagnolo, Cleomar Reginatto, Antonio Thome
Summary: This article presents a bibliographic review of the application of urease in engineering, specifically in the technique called microbially induced calcite precipitation (MICP) or biocementation. The review provides an overview of urease's mechanism of action, kinetic properties, monitoring methods in engineering, and recent findings in the field. The study identifies three main areas of application for MICP in engineering: improvement of geomechanical properties of sandy soils, bioremediation of contaminated soils, and incorporation of MICP technique into mortars and concretes as a substitute for conventional cement. The findings suggest that urease shows promise in increasing soil load capacity, immobilizing metal ions, and self-healing and revitalizing cracks in concretes and mortars.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2022)
Article
Environmental Sciences
Carla Comadran-Casas, Carl J. Schaschke, Joseph C. Akunna, M. Ehsan Jorat
Summary: The study found that cow urine can be a suitable nutrient source for MICP, with urea concentration and stability in fresh and sterilised cow urine suitable for application. The soil response to cow urine treatments was similar to the chemical-based solution, and increasing solution pH resulted in faster activation of ureolytic microorganisms.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Engineering, Geological
J. Zhang, A. Deng, M. Jaksa
Summary: The study showed that adding up to 1% fibers to micaceous soil can increase its compressive strength and material stiffness, while adding 1.5% fibers can further enhance ductility. Additionally, the combination of fibers with hydrated lime or slag-lime can further improve the strength and stiffness of micaceous soil.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Lucas Crane, Hannah Ray, Nasser Hamdan, Treavor H. Boyer
Summary: Enzyme-induced carbonate precipitation (EICP) has the potential to reduce carbon dioxide emissions compared to traditional cementation methods. This study investigated the use of fresh human urine and calcium-rich zeolites as sustainable alternatives for EICP. The results demonstrated that calcium-rich chabazite had higher ammonium adsorption and calcium release capabilities compared to calcium-rich clinoptilolite. The inclusion of a pre-hydrolysis step and longer adsorption times had significant impacts on ammonium adsorption and precipitation outcomes.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Sivakumar Gowthaman, Moeka Yamamoto, Kazunori Nakashima, Volodymyr Ivanov, Satoru Kawasaki
Summary: Biocementation technology is a new soil improvement method which involves the enzymatic formation of calcium carbonate or calcium phosphate. Compared to conventional methods, calcium phosphate biocementation can control the release of ammonium ions and gaseous ammonia at different pH ranges, while improving the soil's compressive strength.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Monika Dagliya, Neelima Satyam, Ankit Garg
Summary: In this study, an environmentally friendly microbial-induced calcium carbonate precipitation (MICP) technique was used to reinforce desert sand using the stopped-flow pouring method. Experimental results showed that biotreatment with urease-producing bacteria and cementation solution significantly improved the strength of the sand and exhibited rock-like behavior.
Article
Construction & Building Technology
Mohamed G. Arab, Haider Rohy, Waleed Zeiada, Abduallah Almajed, Maher Omar
Summary: The use of enzyme-induced carbonate precipitation (EICP) with jack bean meal as a cost-effective enzyme source was studied to improve soil strength by bonding sand particles. Increasing the EICP solution concentration facilitated dense calcite precipitation, leading to higher soil strength. Higher curing temperatures resulted in more efficient enzyme activity and enhanced calcite and aragonite precipitation, contributing to increased soil strength.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Dian-Long Wang, Chao-Sheng Tang, Xiao-Hua Pan, Rui Wang, Min Shi, Zhi-Hao Dong, Yi-Cheng Zhang, Bin Shi
Summary: This study proposes a novel bio-carbonation method using urea pre-hydrolysis to stabilize geomaterial with reactive magnesia cement (RMC). The pre-hydrolysis of urea in the bacterial solution enhances the RMC bio-carbonation reaction, resulting in the formation of more hydrated magnesia carbonates (HMCs) that contribute to strength gain. The study investigates the effect of urea pre-hydrolysis on the engineering performance of bio-carbonated samples and provides insights for the design of bio-carbonated RMC in field applications.
Article
Microbiology
Yongshuai Sun, Xinyan Zhong, Jianguo Lv, Guihe Wang
Summary: This study mainly focused on the effects of microbial induced calcium carbonate precipitation (MICP) technology and the combined effect of MICP technology and lignin on the improvement of silt in the Beijing area. The optimal values of cement concentration and lignin were determined by conducting unconfined compressive strength and dynamic triaxial test methods. The results showed that MICP technology combined with lignin could effectively improve the compressive strength of the silt sample.
Article
Engineering, Environmental
Yang Zhao, Shaojie Yang, Zhiyang Xiao, Wanyi Zhu, Fanyou Meng, Beibei Zhang, Mengnan Yuan
Summary: Silica powder is combined with microbial-induced calcium carbonate precipitation (MICP) technology to improve the efficiency of MICP by utilizing the good activity of silica powder. The influence of silica powder on the physical and mechanical properties of bio-treated medium-coarse soil was studied. Results showed that silica powder content increased bacterial activity retention rate, calcium carbonate content, and unconfined compressive strength, while decreasing permeability and improving durability. Overall, waste silica powder can be effectively reused in MICP technology due to its enhancement on the performance of MICP treated sand.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Construction & Building Technology
Lu Jiang, Wei Lu, Wenjing Wang, Yu Zhang, Qiangqiang Han, Zhu Li
Summary: This paper investigates the physical and mechanical properties of self-healing concrete based on Microbial-induced carbonate precipitation (MICP), focusing on the effects of different mixing methods and self-healing agent (SHA) particle size. The results indicate that the compressive strength and splitting tensile strength of concrete gradually decrease with the increasing amount of the SHA. The splitting tensile strength decreases slightly compared with the compressive strength of self-healing concrete. However, the frost resistance of concrete increases firstly and then decreases with the increase of SHA content.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Environmental Sciences
Xiao-jun Liu, Jin-yue Fan, Jing Yu, Xin Gao
Summary: This study investigates the application of MICP technology in enhancing the engineering properties of loess, demonstrating significant improvements can be achieved. Under optimal conditions, such as a reaction temperature of 30 degrees C and a pH of 9, higher inoculation ratios can lead to increased enzyme activity and monomer enzyme activity, resulting in a nearly fourfold increase in unconfined compressive strength of loess samples treated with MICP. Additionally, MICP has a substantial impact on surface porosity of loess samples, followed by pore fractal dimension and probability entropy, while exerting minimal influence on pore average form factor.
JOURNAL OF MOUNTAIN SCIENCE
(2021)
Article
Ecology
Masaru K. Nobu, Jeremy A. Dodsworth, Senthil K. Murugapiran, Christian Rinke, Esther A. Gies, Gordon Webster, Patrick Schwientek, Peter Kille, R. John Parkes, Henrik Sass, Bo B. Jorgensen, Andrew J. Weightman, Wen-Tso Liu, Steven J. Hallam, George Tsiamis, Tanja Woyke, Brian P. Hedlund
Article
Environmental Sciences
Ewa A. Poniecka, Elizabeth A. Bagshaw, Martyn Tranter, Henrik Sass, Christopher J. Williamson, Alexandre M. Anesio
ARCTIC ANTARCTIC AND ALPINE RESEARCH
(2018)
Article
Biotechnology & Applied Microbiology
Andrew J. Watkins, Erwan G. Roussel, R. John Parkes, Henrik Sass
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2014)
Article
Ecology
Louise A. O'Sullivan, Erwan G. Roussel, Andrew J. Weightman, Gordon Webster, Casey R. J. Hubert, Emma Bell, Ian Head, Henrik Sass, R. John Parkes
Review
Geosciences, Multidisciplinary
R. John Parkes, Barry Cragg, Erwan Roussel, Gordon Webster, Andrew Weightman, Henrik Sass
Article
Environmental Sciences
Ronald John Parkes, Sabrina Berlendis, Erwan G. Roussel, Hasiliza Bahruji, Gordon Webster, Anthony Oldroyd, Andrew J. Weightman, Michael Bowker, Philip R. Davies, Henrik Sass
ENVIRONMENTAL MICROBIOLOGY REPORTS
(2019)
Article
Microbiology
Ewa A. Poniecka, Elizabeth A. Bagshaw, Henrik Sass, Amelia Segar, Gordon Webster, Christopher Williamson, Alexandre M. Anesio, Martyn Tranter
FRONTIERS IN MICROBIOLOGY
(2020)
Article
Microbiology
Gordon Webster, Barry A. Cragg, Joachim Rinna, Andrew J. Watkins, Henrik Sass, Andrew J. Weightman, R. John Parkes
Summary: This study analyzed the microbial diversity, geochemistry, and methanogenic activity of mud volcanoes in the Gulf of Cadiz. The results showed variable prokaryotic populations and activities, influenced by the geochemical heterogeneity of the sediments. Methane production from methyl compounds was higher than from other substrates, and only methylotrophic methanogenesis was observed in all the analyzed mud volcanoes. Further research is needed to determine the full contribution of these mud volcanoes to the global methane and carbon cycles.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Ecology
Felipe S. Freitas, Philip A. Pika, Sabine Kasten, Bo B. Jorgensen, Jens Rassmann, Christophe Rabouille, Shaun Thomas, Henrik Sass, Richard D. Pancost, Sandra Arndt
Summary: This study quantifies the apparent OM reactivity in marine sediments and finds that the variability is predominantly driven by parameter a, with parameter v falling within a narrow range. The results suggest that the large-scale variability in apparent OM reactivity is a function of the whole depositional environment, rather than single environmental controls.
Proceedings Paper
Engineering, Civil
C. A. Spencer, H. Sass
4TH INTERNATIONAL CONFERENCE ON INNOVATIVE MATERIALS, STRUCTURES AND TECHNOLOGIES (IMST 2019)
(2019)
Article
Microbiology
Gordon Webster, Alex J. Mullins, Andrew J. Watkins, Edward Cunningham-Oakes, Andrew J. Weightman, Eshwar Mahenthiralingam, Henrik Sass
MICROBIOLOGY RESOURCE ANNOUNCEMENTS
(2019)
Article
Microbiology
Erwan G. Roussel, Barry A. Cragg, Gordon Webster, Henrik Sass, Xiaohong Tang, Angharad S. Williams, Roberta Gorra, Andrew J. Weightman, R. John Parkes
FEMS MICROBIOLOGY ECOLOGY
(2015)
