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Gao L, Feng X, Zhang Y, Guo H, Mu X, Huang Z, Urynowicz M. Methane production from the biodegradation of lignite with different sizes by mixed fungi-methanogen microflora. FEMS Microbiol Lett 2024; 371:fnae037. [PMID: 38849297 DOI: 10.1093/femsle/fnae037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/09/2024] [Accepted: 06/06/2024] [Indexed: 06/09/2024] Open
Abstract
Biogenic coalbed methane (CBM) is a developing clean energy source. However, it is unclear how the mechanisms of bio-methane production with different sizes of coal. In this work, pulverized coal (PC) and lump coal (LC) were used for methane production by mixed fungi-methanogen microflora. The lower methane production from LC was observed. The aromatic carbon of coal was degraded slightly by 2.17% in LC, while 11.28% in PC. It is attributed to the proportion of lignin-degrading fungi, especially Penicillium, which was reached 67.57% in PC on the 7th day, higher than that of 11.38% in LC. The results suggested that the limited interaction area in LC led to microorganisms hardly utilize aromatics. It also led the accumulation of aromatic organics in the fermentation broth in PC. Increasing the reaction area of coal and facilitating the conversion of aromatic carbon are suggested means to increase methane production in situ.
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Affiliation(s)
- Longzhen Gao
- Department of Safety Engineering, College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiao Feng
- Department of Safety Engineering, College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Yixuan Zhang
- Department of Safety Engineering, College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Hongguang Guo
- Department of Safety Engineering, College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaogang Mu
- Department of Safety Engineering, College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Zaixing Huang
- Department of Biological Engineering, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
- Department of Civil & Architectural Engineering, University of Wyoming, Laramie, WY 82071, United States
| | - Michael Urynowicz
- Department of Civil & Architectural Engineering, University of Wyoming, Laramie, WY 82071, United States
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Feng X, Zhang P, Zhang Z, Guo H, Li Z, Huang Z, Urynowicz M, Ali MI. The effect of organics transformation and migration on pore structure of bituminous coal and lignite during biomethane production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27945-8. [PMID: 37335506 DOI: 10.1007/s11356-023-27945-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 05/23/2023] [Indexed: 06/21/2023]
Abstract
Biomethane generation by coal degradation not only can increase coalbed methane (CBM) reserves, namely, microbially enhanced coalbed methane (MECBM), but also has a significant effect on the pore structure of coal which is the key factor in CBM extraction. The transformation and migration of organics in coal are essential to pore development under the action of microorganisms. Here, the biodegradation of bituminous coal and lignite to produce methane and the cultivation with inhibition of methanogenic activity by 2-bromoethanesulfonate (BES) were performed to analyze the effect of biodegradation on coal pore development by determining the changes of the pore structure and the organics in culture solution and coal. The results showed that the maximum methane productions from bituminous coal and lignite were 117.69 μmol/g and 166.55 μmol/g, respectively. Biodegradation mainly affected the development of micropore whose specific surface area (SSA) and pore volume (PV) decreased while the fractal dimension increased. After biodegradation, various organics were generated which were partly released into culture solution while a large number of them remained in residual coal. The content of newly generated heterocyclic organics and oxygen-containing aromatics in bituminous coal was 11.21% and 20.21%. And the content of heterocyclic organics in bituminous coal was negatively correlated with SSA and PV but positively correlated with the fractal dimension which suggested that the retention of organics contributed greatly to the decrease of pore development. But the retention effect on pore structure was relatively poor in lignite. Besides, microorganisms were observed around fissures in both coal samples after biodegradation which would not be conducive to the porosity of coal on the micron scale. These results revealed that the effect of biodegradation on pore development of coal was governed by the combined action of organics degradation to produce methane and organics retention in coal whose contributions were antagonistic and determined by coal rank and pore aperture. The better development of MECBM needs to enhance organics biodegradation and reduce organics retention in coal.
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Affiliation(s)
- Xiao Feng
- College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
- Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Panpan Zhang
- College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
- Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Zizhong Zhang
- College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
- Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Hongguang Guo
- College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.
- Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China.
| | - Zhigang Li
- College of Safety and Emergency Management and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
- Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Zaixing Huang
- School of Chemical Engineering Technology, China University of Mining and Technology, Xuzhou, 221116, China
| | - Michael Urynowicz
- Department of Civil & Architectural Engineering, University of Wyoming, Laramie, WY, 82071, USA
| | - Muhammad Ishtiaq Ali
- Environmental Microbiology Lab, Department of Microbiology, Quaid-I-Azam University, Islamabad, 45320, Pakistan
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Molecular structure characterization analysis and molecular model construction of anthracite. PLoS One 2022; 17:e0275108. [DOI: 10.1371/journal.pone.0275108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 09/11/2022] [Indexed: 11/18/2022] Open
Abstract
Coal is the largest non-renewable energy as well as an important basic energy and industrial raw material. Thus, correctly understanding the molecular structure characteristics of coal has important theoretical value for realizing carbon neutralization. In this work, we clarified the molecular structure characteristics of anthracite, where the organic matter in anthracite was characterized and analyzed by industrial/elemental analysis, FTIR, XPS, XRD and solid 13C NMR. The ratio of bridge carbon to the perimeter carbon of anthracite was 0.38, and the degree of condensation in the aromatic structure was high. Nitrogen in coal primarily exists in the form of pyridine and pyrrole. Based on the information on functional group composition, the carbon skeleton structure, and surface element composition, a molecular structure model of Yangquan anthracite could be constructed, where the molecular formula was C208H162O12N4. This study may serve as a reference for researchers in this field to consult and refer to the construction ideas and methods of molecular structure models of different coal samples.
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