Coal Dust Consolidation Using Calcium Carbonate Precipitation Induced by Treatment with Mixed Cultures of Urease-Produci
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Coal Dust Consolidation Using Calcium Carbonate Precipitation Induced by Treatment with Mixed Cultures of Urease-Producing Bacteria Shucang Zhu & Xiangming Hu & Yanyun Zhao & Yijin Fan & Mingyue Wu & Weimin Cheng & Peiyao Wang & Shumin Wang
Received: 29 November 2019 / Accepted: 6 August 2020 # Springer Nature Switzerland AG 2020
Abstract To promote the application of microbially induced mineralization technology in the field of coal dust suppression, two urease-producing bacteria were co-cultured, with the aim to define the influence of different culture conditions on the growth and urease activity of the bacteria. According to the results, when S. pasteurii and B. cereus CS1 were inoculated in succession at a volume ratio of 1:1 and an interval of 14 h, the mixed bacteria achieved optimal growth and had the highest urease activity; when the initial pH value of culture medium was 9 and the urea and Ca2+ concentrations in the substrate were uniformly 0.1 mol/L, the growth and urease activity of the mixed bacterial culture reached their peaks. SEM-EDS and XRD results indicated that, regardless of the specific urease-producing bacteria used (single urease-producing bacteria or the mixed urease-producing bacteria), their mineralization products were uniformly vaterite-type and calcite-type calcium carbonate; FTIR and thermogravimetric analysis also confirmed their mineralization products as calcium carbonate. By spraying the bacterial inoculants S. Zhu : X. Hu : Y. Zhao : Y. Fan : M. Wu : W. Cheng : P. Wang : S. Wang College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590 Shandong, China S. Zhu : X. Hu : Y. Zhao (*) : Y. Fan : M. Wu : W. Cheng : P. Wang : S. Wang Key Lab of Mine Disaster Prevention and Control, College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590 Shandong, China e-mail: [email protected]
with a corresponding calcium source and urea on pulverized coal, it was found that the bacteria successfully survived and caused pulverized coal to be consolidated. In particular, the mixed bacterial inoculant manifested a stronger consolidation effect, with a wind erosion– induced mass loss of less than 20 g/(m2•h). We provide experimental support for the field of microbial coal dust suppression. Keywords Coal dust suppression . Coal dust pollution . Environmentally friendly dust suppressant . Microbially induced calcite precipitation (MICP)
1 Introduction Coal, as a basic energy source, has always occupied a dominant position in the energy production and consumption structure of our country. However, coal dust is generated in large amounts during mining (Zhang et al. 2018; Tang and Cai 2018), transport, storage, and use of coal, which not only causes environmental pollution and harms human health (Wu et al. 2019a, b) but may also pose explosive risks (Wang et al. 2019a, b, c). Thus, coal dust control is an inevitable problem in coal production and use. To eliminate potential safety hazards in coal pr
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