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Eskanlou A, Arnold BJ. An evaluation of pyrite as a component of respirable coal dust. JOURNAL OF HAZARDOUS MATERIALS 2024; 477:135340. [PMID: 39096642 DOI: 10.1016/j.jhazmat.2024.135340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 06/25/2024] [Accepted: 07/25/2024] [Indexed: 08/05/2024]
Abstract
Over the past two decades, the rise in coal worker's pneumoconiosis has prompted research into the effects of respirable coal dust components. This study explores how coal-pyrites produce hydroxyl radicals (•OH), a reactive oxygen species closely associated with particle toxicity, and assesses the ability of safe chemical additives to reduce •OH production at various pH levels. Promising candidates were evaluated in various solutions, including tap and process waters and simulated lung fluid. We employed electrokinetic measurements, infrared and X-ray photoelectron spectroscopies, and ab initio atomistic simulations to analyze particle surfaces. The study also looked at how surface aging affects •OH production. Our results show that •OH generation of the pyrite varies and is catalyzed by elements like silicon, aluminum, and iron in pyrite. Carboxymethyl cellulose was effective in reducing •OH production by targeting surface sulfide and silicon sites and affecting surface hydration and charge. Atmospheric aging was found to increase •OH production, especially in the pyrite with high iron and silicon and low calcium contents, relative to other samples. This highlights the role of the pyrite surface properties and chemical composition, and the solution pH and composition in •OH generation by coal-pyrites.
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Affiliation(s)
- Amir Eskanlou
- John and Willie Leone Family Department of Energy and Mineral Engineering, College of Earth and Mineral Science, The Pennsylvania State University, University Park, PA 16802, USA
| | - Barbara J Arnold
- John and Willie Leone Family Department of Energy and Mineral Engineering, College of Earth and Mineral Science, The Pennsylvania State University, University Park, PA 16802, USA.
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Hang W, Bu C, Cui Y, Chen K, Zhang D, Li H, Wang S. Research progress on the pathogenesis and prediction of pneumoconiosis among coal miners. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:319. [PMID: 39012521 DOI: 10.1007/s10653-024-02114-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Accepted: 07/02/2024] [Indexed: 07/17/2024]
Abstract
Pneumoconiosis is the most common occupational disease among coal miners, which is a lung disease caused by long-term inhalation of coal dust and retention in the lungs. The early stage of this disease is highly insidious, and pulmonary fibrosis may occur in the middle and late stages, leading to an increase in patient pain index and mortality rate. Currently, there is a lack of effective treatment methods. The pathogenesis of pneumoconiosis is complex and has many influencing factors. Although the characteristics of coal dust have been considered the main cause of different mechanisms of pneumoconiosis, the effects of coal dust composition, particle size and shape, and coal dust concentration on the pathogenesis of pneumoconiosis have not been systematically elucidated. Meanwhile, considering the irreversibility of pneumoconiosis progression, early prediction for pneumoconiosis patients is particularly important. However, there is no early prediction standard for pneumoconiosis among coal miners. This review summarizes the relevant research on the pathogenesis and prediction of pneumoconiosis in coal miners in recent years. Firstly, the pathogenesis of coal worker pneumoconiosis and silicosis was discussed, and the impact of coal dust characteristics on pneumoconiosis was analyzed. Then, the early diagnostic methods for pneumoconiosis have been systematically introduced, with a focus on image collaborative computer-aided diagnosis analysis and biomarker detection. Finally, the challenge of early screening technology for miners with pneumoconiosis was proposed.
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Affiliation(s)
- Wenlu Hang
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000, Jiangsu Province, People's Republic of China
| | - Chunlu Bu
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000, Jiangsu Province, People's Republic of China
| | - Yuming Cui
- School of Mechatronic Engineering, Jiangsu Normal University, Xuzhou, 221000, Jiangsu Province, People's Republic of China
| | - Kai Chen
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221000, Jiangsu Province, People's Republic of China
| | - Dekun Zhang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221000, Jiangsu Province, People's Republic of China
| | - Haiquan Li
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000, Jiangsu Province, People's Republic of China.
- School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, 221000, Jiangsu Province, People's Republic of China.
| | - Songquan Wang
- School of Mechatronic Engineering, Jiangsu Normal University, Xuzhou, 221000, Jiangsu Province, People's Republic of China.
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3
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Azam S, Liu S, Bhattacharyya S, Mishra DP. Prevalence of nano-sized coal mine dust in North and Central Appalachian coal mines - Insights from SEM-EDS imaging. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135226. [PMID: 39029186 DOI: 10.1016/j.jhazmat.2024.135226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 06/23/2024] [Accepted: 07/14/2024] [Indexed: 07/21/2024]
Abstract
The increasing prevalence of coal mine dust-related lung diseases in coal miners calls for urgent and meticulous scrutiny of airborne respirable coal mine dust (RCMD), specifically focusing on particles at the nano-level. This necessity is driven by expanding research, including the insights revealed in this paper, that establish the presence and significantly increased toxicity of nano-sized coal dust particles in contrast to their larger counterparts. This study presents an incontrovertible visual proof of these tiny particulates in samples collected from underground mines, utilizing advanced techniques such as scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The intricate elemental composition of nano-sized coal dust identified through EDS analysis reveals the presence of elements such as silica and iron, which are known to contribute to lung pathologies when inhaled over prolonged periods. The outcomes of the statistical analyses reveal significant relationships between particle size and elemental composition, highlighting that smaller particles tend to have higher carbon content, while larger particles exhibit increased concentrations of elements like silica and aluminum. These analyses underscore the complex interactions within nano-sized coal dust, providing critical insights into their behavior, transport, and health impacts. The nano-sized coal dust could invade the alveoli, carrying these toxic elements from where they are impossible to exhale. The revelation of nano-sized coal dust's existence and the associated health hazards necessitate their incorporation into the regulatory framework governing the coal mining industry. This study lays the groundwork for heightened protective measures for miners, urging the invention of state-of-the-art sampling instruments, comprehensive physicochemical profiling of RCMD nanoparticles, and the pursuit of groundbreaking remedies to neutralize their toxic impact. These findings advocate for a paradigm shift in how the coal mining industry views and handles particulate matter, proposing a re-evaluation of occupational health standards and a call to action for protecting coal miners worldwide.
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Affiliation(s)
- Sikandar Azam
- Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA
| | - Shimin Liu
- Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Sekhar Bhattacharyya
- Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA
| | - Devi Prasad Mishra
- Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
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Sarver E, Keles C, Lowers H, Zell-Baran L, Go L, Hua J, Cool C, Rose C, Green F, Almberg K, Cohen R. In Situ Lung Dust Analysis by Automated Field Emission Scanning Electron Microscopy With Energy Dispersive X-ray Spectroscopy: A Method for Assessing Inorganic Particles in Lung Tissue From Coal Miners. Arch Pathol Lab Med 2024; 148:e154-e169. [PMID: 38918006 DOI: 10.5858/arpa.2024-0002-oa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/10/2024] [Indexed: 06/27/2024]
Abstract
CONTEXT.— Overexposure to respirable coal mine dust can cause severe lung disease including progressive massive fibrosis (PMF). Field emission scanning electron microscopy with energy dispersive x-ray spectroscopy (FESEM-EDS) has been used for in situ lung dust particle analysis for evaluation of disease etiology. Automating such work can reduce time, costs, and user bias. OBJECTIVE.— To develop and test an automated FESEM-EDS method for in situ analysis of inorganic particles in coal miner lung tissue. DESIGN.— We programmed an automated FESEM-EDS procedure to collect particle size and elemental data, using lung tissue from 10 underground coal miners with PMF and 4 control cases. A statistical clustering approach was used to establish classification criteria based on particle chemistry. Data were correlated to PMF/non-PMF areas of the tissue, using corresponding brightfield microscopy images. Results for each miner case were compared with a separate corresponding analysis of particles recovered following tissue digestion. RESULTS.— In situ analysis of miner tissues showed higher particle number densities than controls and densities were generally higher in PMF than non-PMF areas. Particle counts were typically dominated by aluminum silicates with varying percentages of silica. Compared to digestion results for the miner tissues, in situ results indicated lower density of particles (number per tissue volume), larger size, and a lower ratio of silica to total silicates-probably due to frequent particle clustering in situ. CONCLUSIONS.— Automated FESEM-EDS analysis of lung dust is feasible in situ and could be applied to a larger set of mineral dust-exposed lung tissues to investigate specific histologic features of PMF and other dust-related occupational diseases.
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Affiliation(s)
- Emily Sarver
- From the Department of Mining and Minerals Engineering, Virginia Tech, Blacksburg (Sarver, Keles)
| | - Cigdem Keles
- From the Department of Mining and Minerals Engineering, Virginia Tech, Blacksburg (Sarver, Keles)
| | - Heather Lowers
- Geology, Geophysics, and Geochemistry Science Center, US Geological Survey, Denver, Colorado (Lowers)
| | - Lauren Zell-Baran
- the Division of Environmental and Occupational Health Sciences, National Jewish Health, Denver, Colorado (Zell-Baran, Hua, Rose)
- the Department of Epidemiology, Colorado School of Public Health, University of Colorado, Aurora (Zell-Baran)
| | - Leonard Go
- Environmental and Occupational Health Sciences Division, University of Illinois Chicago School of Public Health, Chicago (Go, Almberg, Cohen)
| | - Jeremy Hua
- the Division of Environmental and Occupational Health Sciences, National Jewish Health, Denver, Colorado (Zell-Baran, Hua, Rose)
- Pulmonary Sciences and Critical Care Medicine, University of Colorado, Aurora (Hua, Rose)
| | - Carlyne Cool
- the Division of Pathology, National Jewish Health, Denver, Colorado (Cool)
- the Department of Pathology, University of Colorado, Aurora (Cool)
| | - Cecile Rose
- the Division of Environmental and Occupational Health Sciences, National Jewish Health, Denver, Colorado (Zell-Baran, Hua, Rose)
- Pulmonary Sciences and Critical Care Medicine, University of Colorado, Aurora (Hua, Rose)
| | - Francis Green
- the Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, Alberta, Canada (Green)
| | - Kirsten Almberg
- Environmental and Occupational Health Sciences Division, University of Illinois Chicago School of Public Health, Chicago (Go, Almberg, Cohen)
| | - Robert Cohen
- Environmental and Occupational Health Sciences Division, University of Illinois Chicago School of Public Health, Chicago (Go, Almberg, Cohen)
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Zhang C, Qian X, Song H, Jia J. A microscopic mechanism study of the effect of binary surfactants on the flotation of Wiser bituminous coal. Sci Rep 2024; 14:14495. [PMID: 38914729 PMCID: PMC11196576 DOI: 10.1038/s41598-024-65466-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Accepted: 06/20/2024] [Indexed: 06/26/2024] Open
Abstract
Investigating surfactant effects on the floatability of Wiser bituminous coal holds significant importance in improving coal cleanliness and utilization value. Using density functional theory and molecular dynamics simulation methods, this study constructed models of Wiser bituminous coal and examined the impact of different surfactants, including the anionic surfactant sodium dodecyl benzene sulfonate, the cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB), and the non-ionic surfactant fatty alcohol ethoxylated ether. The focus was on investigating the charge distribution characteristics of these molecules and the modifying effect of binary surfactants on the hydrophobicity of bituminous coal. Results revealed that the maximum electrostatic potential was concentrated near oxygen/nitrogen/sulfur-containing functional groups like sulfonic acid groups, quaternary ammonium cations, ethylene oxide, hydroxyl groups, carboxyl groups, and sulfur bonds. These functional groups exhibited a propensity for accepting/delivering electrons to form hydrogen bonds. Among the surfactants tested, CTAB revealed the slightest difference in frontier orbital energy, measuring 3.187 eV, thereby demonstrating a superior trapping ability compared with the other two surfactants. Adsorption reactions within the system were determined to be spontaneous, with over 60% of the interaction force attributed to electrostatic forces. Moreover, the repulsive force magnitude with water molecules followed the trend: sulfonate group (2.20 Å) < ethylene oxide (2.43 Å) < quaternary ammonium cation (2.57 Å), indicating more excellent water repellency of CTAB. Findings showed that CTAE binary surfactants proved most effective in modifying the hydrophobicity of bituminous coal. This study offers valuable insights into reducing waste, pollution, and resource wastage.
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Affiliation(s)
- Chun Zhang
- College of Safety Science and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China
- Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
| | - Xianju Qian
- College of Safety Science and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China
- Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
| | - Hailong Song
- College of Safety Science and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
- Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China.
| | - Jinzhang Jia
- College of Safety Science and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China
- Key Laboratory of Thermal Dynamic Disaster Prevention and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China
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Liu H, Wang H, Zhao H, Wang H, Xia R, Wang X, Li M, Zhou J. Speciation, bioaccumulation, and toxicity of the newly deposited atmospheric heavy metals in soil-earthworm (Eisenia fetida) system near a large copper smelter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 924:171700. [PMID: 38490408 DOI: 10.1016/j.scitotenv.2024.171700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/18/2024] [Accepted: 03/11/2024] [Indexed: 03/17/2024]
Abstract
The speciation, bioaccumulation, and toxicity of the newly deposited atmospheric heavy metals in the soil-earthworm (Eisenia fetida) system were investigated by a fully factorial atmospheric exposure experiment using soils exposed to 0.8-year and 1.8-year atmospheric depositions. The results shown that the newly deposited metals (Cu, Cd, and Pb) primarily accumulated in the topsoil (0-6 cm) and were present as the highly bioavailable speciation. They can migrate further to increase the concentrations of Cu, Cd, and Pb in soil solution of the deeper layer (at 10 cm) by 12 %-436 %. Earthworms tended to preferentially accumulate the newly deposited metals, which contributed 10 %-61 % of Cu, Cd, and Pb in earthworms. Further, for the unpolluted and moderately polluted soils, the newly deposited metals induced the significant oxidative stress in earthworms, resulting in significant increases in antioxidant enzyme activities (SOD, CAT, and GSH-Px). No significant differences were observed in the levels of heavy metals in soil solutions, bioaccumulation, and enzyme activities in earthworms exposed to 0.8-year and 1.8-year depositions, indicating the bioavailability of atmospheric metals deposited into soils was rapidly decreased with time. This study highlights the high bioaccumulation and toxicity of heavy metals to earthworm from the new atmospheric deposition during the earthworm growing period.
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Affiliation(s)
- Hailong Liu
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Haotian Wang
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China
| | - Huan Zhao
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China
| | - Hu Wang
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China
| | - Ruizhi Xia
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Xiaozhi Wang
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China
| | - Min Li
- College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, PR China.
| | - Jun Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
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Huang X, Mu M, Wang B, Zhang H, Liu Y, Yu L, Zhou M, Ma J, Wang D, Chen W. Associations of coal mine dust exposure with arterial stiffness and atherosclerotic cardiovascular disease risk in chinese coal miners. Int Arch Occup Environ Health 2024; 97:473-484. [PMID: 38530481 DOI: 10.1007/s00420-024-02062-2] [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: 10/18/2023] [Accepted: 03/09/2024] [Indexed: 03/28/2024]
Abstract
OBJECTIVE Whether coal mine dust exposure increases cardiovascular diseases (CVDs) risk was rarely explored. Our objective was to examine the association between coal mine dust exposure and cardiovascular risk. METHODS We estimated cumulative coal mine dust exposure (CDE) for 1327 coal miners by combining data on workplace dust concentrations and work history. We used brachial-ankle pulse wave velocity (baPWV, a representative indicator of arterial stiffness) and ten-year atherosclerotic cardiovascular disease (ASCVD) risk to assess potential CVD risk, exploring their associations with CDE. RESULTS Positive dose-response relationships of CDE with baPWV and ten-year ASCVD risk were observed after adjusting for covariates. Specifically, each 1 standard deviation (SD) increase in CDE was related to a 0.27 m/s (95% CI: 0.21, 0.34) increase in baPWV and a 1.29 (95% CI: 1.14, 1.46) elevation in OR (odds ratio) of risk of abnormal baPWV. Moreover, each 1 SD increase in CDE was associated with a 0.74% (95% CI: 0.63%, 0.85%) increase in scores of ten-year ASCVD and a 1.91 (95% CI: 1.62, 2.26) increase in OR of risk of ten-year ASCVD. When compared with groups unexposed to coal mine dust, significant increase in the risk of arterial stiffness and ten-year ASCVD in the highest CDE groups were detected. CONCLUSION The study suggested that cumulative exposure to coal mine dust was associated with elevated arterial stiffness and ten-year ASCVD risk in a dose-response manner. These findings contribute valuable insights for cardiovascular risk associated with coal mine dust.
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Affiliation(s)
- Xuezan Huang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Min Mu
- Key Laboratory of Industrial Dust Control and Occupational Health of the Ministry of Education, Anhui University of Science and Technology, Huainan, 232000, Anhui, China
| | - Bin Wang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Haozhe Zhang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Yang Liu
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Linling Yu
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Min Zhou
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Jixuan Ma
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Dongming Wang
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China.
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China.
| | - Weihong Chen
- Department of Occupational & Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China.
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China.
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Geng Y, Zhang C, He P, Wang Y, Kong L, Li Z, Wei B, Ma Y, Liang H, Ding C, Tie C. Urine LMs quantitative analysis strategy development and LMs CWP biomarkers discovery. Prostaglandins Other Lipid Mediat 2024; 171:106816. [PMID: 38302009 DOI: 10.1016/j.prostaglandins.2024.106816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 01/22/2024] [Accepted: 01/27/2024] [Indexed: 02/03/2024]
Abstract
Coal workers' pneumoconiosis (CWP) is one of the most common inhalation occupational diseases. It is no effective treatment methods. Early diagnosis of CWP could reduce mortality. Lipid mediators (LMs) as key mediators in the generation and resolution of inflammation, are natural biomarkers for diagnosis inflammatory disease, such as CWP. The UHPLC-MRM technique was used to detect LMs in urine. The metabolic network of LMs in CWP and CT group samples was comprehensively analyzed. Screening for major difference compounds between the two groups. Aimed to contribute to the early diagnosis and treatment of CWP. Urinary levels of 13-OxoODE, 9-OxoODE, and 9,10-EpOME were significantly higher in the CWP group compared with the CT group (P < 0.05). In the model group, the area under the receiver operating characteristic (ROC) for 9-OxoODE,13-OxoODE,9,10-EpOME was 84.4%, 73.3%, and 80.9%, respectively. In the validation group, the area under the ROC was 87.0%, 88.8%, and 68.8% for 9-OxoODE,13-OxoODE,9,10-EpOME, respectively. According to the logistic regression model, the area under the ROC was 80.4% in the model group and 86.7% in the validation group. 13-OxoODE,9-OxoODE,9,10-EpOME could be used as biomarkers for early diagnosis. Significant abnormalities of LOX and CYP450 enzyme pathways were seen in CWP organisms. Changes in the CYP450 enzyme pathway may be associated with PAHs.
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Affiliation(s)
- Yicong Geng
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Chunmin Zhang
- National Center for Occupational Safety and Health, NHC, 27 Shilong North Road, Beijing 102308, China
| | - Ping He
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Yi Wang
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Lingfei Kong
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Zhengying Li
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Bin Wei
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Yufang Ma
- Clinical Pharmacology Research Center, State Key Laboratory of Complex Severe and Rare Diseases, NMPA Key Laboratory for Clinical Research and Evaluation of Drug, Beijing Key Laboratory of Clinical PK & PD Investigation for Innovative Drugs, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Handong Liang
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China
| | - Chunguang Ding
- National Center for Occupational Safety and Health, NHC, 27 Shilong North Road, Beijing 102308, China
| | - Cai Tie
- State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China; School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Ding11 Xueyuan Road, Beijing 100083, China.
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Geng F, An J, Wang Y, Gui C, Guo H, Wen T. Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:102244-102259. [PMID: 37665436 DOI: 10.1007/s11356-023-28911-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 07/17/2023] [Indexed: 09/05/2023]
Abstract
Dust exposures during mining activity can result in lung diseases such as coal workers' pneumoconiosis (CWP) and silicosis, and it is closely related to quartz dust. In the present study, coal-quartz dust mixture were investigated considering the particle size and the specific constituents. Multiple numerical techniques, including computational fluid dynamics and discrete element method (CFD-DEM), hard sphere model, and direct Monte Carlo simulation (DSMC), were presented, and the dust diffusion processes were investigated. According to the validation of the numerical method, the suspension characteristics of the polydisperse mixed dust were analyzed in detail. The results show that PM10 responds quickly, has a large diffusion range, and is easily affected by the reflux. The particle size increases gradually from top to bottom. When the air velocity is low, the percentage of coal dust in the breathing zone tends to be 50%. The results provide theoretical guidance for the comprehensive prevention of the mixed dust in underground coal mines.
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Affiliation(s)
- Fan Geng
- School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
| | - Jiajun An
- School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Yingchao Wang
- School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China
| | - Changgeng Gui
- School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Heng Guo
- School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Tianliang Wen
- School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
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10
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Nie W, Xue Q, Guo L, Li F, Hua Y, Liu Q, Sun N, Jiang C, Yu F. Analysis of the dust-methane two-phase coupling blowdown effect at different air duct positions in an excavation anchor synchronous tunnel. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:84491-84515. [PMID: 37368204 DOI: 10.1007/s11356-023-27951-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
Bolter miners are being increasingly used. Unfortunately, this mining technology causes a considerable amount of air pollution (especially by methane and dust) during excavation. In this study, the multiphase coupling field of airflow-dust-methane for different distances between the pressure air outlet and the working face (Lp) was simulated by using the FLUENT software. The migration law of pollutants in the multiphase coupling field was analyzed, and the distance parameters between the pressure air outlet and the working face were optimized. Finally, the simulation results were verified based on the field measurement results. We found that the blowdown effect was more obvious when 14 m ≤ Lp < 16 m compared with other conditions. The peak value of dust concentration within this distance range was the smallest (44.4% lower than the highest peak value, which was verified when Lp = 18 m), while the methane concentration was < 0.6%. A high-concentration area (where methane concentration > 0.75%), identified near the walking part of the bolter miner, was 13 m shorter than the largest (when Lp = 18 m). Therefore, we determined that the optimal blowdown distance would be 14 m ≤ Lp < 16 m. Within this range, the dust removal and methane dilution effects are optimal, effectively improving the tunnel air quality and providing a safe and clean environment for mine workers.
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Affiliation(s)
- Wen Nie
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Qianqian Xue
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Lidian Guo
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China.
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Faxin Li
- College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
| | - Yun Hua
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Qiang Liu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Ning Sun
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Chenwang Jiang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Fengning Yu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China
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Azam S, Kurashov V, Golbeck JH, Bhattacharyya S, Zheng S, Liu S. Comparative 6+studies of environmentally persistent free radicals on nano-sized coal dusts. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 878:163163. [PMID: 37003338 DOI: 10.1016/j.scitotenv.2023.163163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 03/23/2023] [Accepted: 03/26/2023] [Indexed: 05/13/2023]
Abstract
Coal dust is the major hazardous pollutant in the coal mining environment. Recently environmentally persistent free radicals (EPFRs) were identified as one of the key characteristics which could impart toxicity to the particulates released into the environment. The present study used Electron Paramagnetic Resonance (EPR) spectroscopy to analyze the characteristics of EPFRs present in different types of nano-size coal dust. Further, it analyzed the stability of the free radicals in the respirable nano-size coal dust and compared their characteristics in terms of EPR parameters (spin counts and g-values). It was found that free radicals in coal are remarkably stable (can remain intact for several months). Also, Most of the EPFRs in the coal dust particles are either oxygenated carbon centered or a mixture of carbon and oxygen-centered free radicals. EPFRs concentration in the coal dust was found to be proportional to the carbon content of coal. The characteristic g-values were found to be inversely related to the carbon content of coal dust. The spin concentrations in the lignite coal dust were between 3.819 and 7.089 μmol/g, whereas the g-values ranged from 2.00352 to 2.00363. The spin concentrations in the bituminous coal dust were between 11.614 and 25.562 μmol/g, whereas the g-values ranged from 2.00295 to 2.00319. The characteristics of EPFRs present in coal dust identified by this study are similar to the EPFRs, which were found in other environmental pollutants such as combustion-generated particulates, PM2.5, indoor dust, wildfires, biochar, haze etc., in some of the previous studies. Considering the toxicity analysis of environmental particulates containing EPFRs similar to those identified in the present study, it can be confidently hypothesized that the EPFRs in the coal dust might play a major role in modulating the coal dust toxicity. Hence, it is recommended that future studies should analyze the role of EPFR-loaded coal dust in mediating the inhalation toxicity of coal dust.
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Affiliation(s)
- Sikandar Azam
- Department of Energy and Mineral Engineering, G(3) Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA
| | - Vasily Kurashov
- Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA
| | - John H Golbeck
- Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA
| | - Sekhar Bhattacharyya
- Department of Energy and Mineral Engineering, G(3) Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA
| | - Siyang Zheng
- Department of Biomedical Engineering, College of Engineering, Carnegie Mellon University, 15213, USA
| | - Shimin Liu
- Department of Energy and Mineral Engineering, G(3) Center and Energy Institute, The Pennsylvania State University, University Park, PA 16802, USA.
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Teng H, Geng F, Feng X, An J, Li S, Gui C, Hu S, Guo H, Zhou F. Coal dust dispersion with the moving conveyance in a high-rise building for the mine hoist system. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-26709-8. [PMID: 37183224 DOI: 10.1007/s11356-023-26709-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 03/25/2023] [Indexed: 05/16/2023]
Abstract
The present study investigates dust generated from the unloading process in a high-rise building for the mine hoist system and analyzes dust dispersion with the moving conveyance in the building. First, the gas-solid two-phase flow in the building was investigated based on the CFD-DPM method. In particular, the moving conveyance was considered in detail and treated via the dynamic mesh technology. Then, the airflow and dust distribution were investigated in the building. The airflow and the dust concentration at selected points show good agreement with the relative results of field measurements by ourselves. It is found that the descending conveyance significantly influences the surrounding flow field and the spatial and temporal distribution of dust. Dust concentration before the dust source (2 m × 2 m) is high, which extends downward with the conveyance. Dust concentration of the lower floors increases obviously when compared with that of the condition without the movement of the conveyance. The descending velocity of the conveyance also affects the amount of PM2.5 discharged from the return air outlet. The fitting functions are provided to predict PM2.5 emissions to the surrounding atmosphere. The research results are of great significance for the improvement of the dust control system for cleaner production technology.
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Affiliation(s)
- Haixu Teng
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Fan Geng
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
| | - Xinyue Feng
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Jiajun An
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Shihang Li
- Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, 221116, China
| | - Changgeng Gui
- School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Shuda Hu
- School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Heng Guo
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China
| | - Fubao Zhou
- School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China
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13
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Xie Y, Ye Y, Yu H, Cheng W, Xie S, Zhao J. Influence law of structural parameters of pressure-swirl nozzle on atomization effect based on multiscale model. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:60129-60149. [PMID: 37017838 DOI: 10.1007/s11356-023-26711-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 03/25/2023] [Indexed: 05/10/2023]
Abstract
The dust pollution at the fully mechanized heading face has seriously threatened the health of the miners. As the main technical means, the outer spray of a roadheader has the problems of small coverage of the fog field and low dust removal efficiency. Based on the multiscale swirl atomization model of LES-VOF, this study simulated and analyzed the atomization process of the nozzle. The influence law of the diameter, the length and the circulation area ratio of the swirl chamber, and the swirl core angle on the swirl number and atomization effect were determined, and the nonlinear function relationship between variables was obtained. With the help of the BP neural network model, a new type of swirl nozzle is developed which is suitable for the outside spray system at the fully mechanized heading face. The experimental results show that the error between the predicted results of the new swirl nozzle and BP network model is less than 15%, the atomization angle θc is 24.2°, the average particle size D32 is 64.43 µm, and the effective range Reff is about 2.1 m. At the same time, the total dust removal efficiency and respirable dust removal efficiency of the new swirl nozzle at the driver's place are 61.10% and 63.85%, respectively, which are 21.69% and 20.92% higher than the original nozzle.
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Affiliation(s)
- Yao Xie
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Yuxi Ye
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Haiming Yu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Weimin Cheng
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Sen Xie
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Junwei Zhao
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
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14
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Chang F, Zhao S, Lei Y, Peng S, Liu DG, Kong Y. Ball-milling fabrication of n-p heterojunctions Bi4O5Br2/α-MnS with strengthened photocatalytic removal of bisphenol A in a Z-Scheme model. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122324] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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15
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Study on the combined dust suppression effect of sodium alginate and sodium fatty acid methyl ester sulfonate. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Wu MY, Shi XC, Shan J, Wang R, Wang Y, Li J, Tian DN, Xu HM. Role of non-neuronal cholinergic system in the early stage response of epithelial-mesenchymal transformation related markers in A549 cells induced by coal particles. Heliyon 2022; 8:e11751. [DOI: 10.1016/j.heliyon.2022.e11751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/09/2022] [Accepted: 11/14/2022] [Indexed: 11/25/2022] Open
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17
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Yuan J, Wang T, Wang L, Li P, Shen H, Mo Y, Zhang Q, Ni C. Transcriptome-wide association study identifies PSMB9 as a susceptibility gene for coal workers' pneumoconiosis. ENVIRONMENTAL TOXICOLOGY 2022; 37:2103-2114. [PMID: 35506645 DOI: 10.1002/tox.23554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 04/13/2022] [Accepted: 04/23/2022] [Indexed: 06/14/2023]
Abstract
Coal workers' pneumoconiosis (CWP) is a type of typical occupational lung disease caused by prolonged inhalation of coal mine dust. The individuals' different genetic background may underlie their different susceptibility to develop pneumoconiosis, even under the same exposure level. This study aimed to identify susceptibility genes associated with CWP. Based on our previous genome-wide association study (GWAS, 202 CWP cases vs. 198 controls) and gene expression data obtained by analyzing human lungs and whole blood from the Genotype-Tissue Expression (GTEx) Portal, a transcriptome-wide association study (TWAS) was applied to identify CWP risk-related genes. Luciferase report gene assay, qRT-PCR, Western blot, immunofluorescence assay, and TUNEL assay were conducted to explore the potential role of the candidate gene in CWP. Proteasome 20S subunit beta 9 (PSMB9) was identified as a strong risk-related gene of CWP in both lungs and whole blood (Lungs: PTWAS = 4.22 × 10-4 ; Whole blood: PTWAS = 2.11 × 10-4 ). Single nucleotide polymorphisms (SNPs) rs2071480 and rs1351383, which locate in the promoter region and the first intron of the PSMB9 gene, were in high linkage disequilibrium (LD, r2 = 0.98) with the best GWAS SNP rs4713600 (G>T, OR = 0.55, 95% CI: 0.42-0.74, P = 6.86 × 10-5 ). Both rs2071480 and rs1351383 significantly enhanced the transcriptional activity of PSMB9. Functional experiments revealed that silica exposure remarkably reduced the PSMB9 expression and caused cell apoptosis, while overexpression of PSMB9 markedly abolished silica-induced cell apoptosis. We here identified PSMB9 as a novel susceptibility gene for CWP and provided important insights into the further exploration of the CWP pathogenesis.
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Affiliation(s)
- Jiali Yuan
- Center for Global Health, Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Ting Wang
- Department of Pathology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China
| | - Lijuan Wang
- Center for Global Health, Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Ping Li
- Center for Global Health, Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Hongbing Shen
- Center for Global Health, Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Yiqun Mo
- Department of Epidemiology and Population Health, School of Public Health and Information Sciences, University of Louisville, Louisville, Kentucky, USA
| | - Qunwei Zhang
- Department of Epidemiology and Population Health, School of Public Health and Information Sciences, University of Louisville, Louisville, Kentucky, USA
| | - Chunhui Ni
- Center for Global Health, Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, China
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Zhang Y, Li A, Gao J, Liang J, Cao N, Zhou S, Tang X. Differences in the characteristics and pulmonary toxicity of nano- and micron-sized respirable coal dust. Respir Res 2022; 23:197. [PMID: 35906696 PMCID: PMC9338665 DOI: 10.1186/s12931-022-02120-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 07/21/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The characteristics of coal dust (CD) particles affect the inhalation of CD, which causes coal worker's pneumoconiosis (CWP). CD nanoparticles (CD-NPs, < 500 nm) and micron particles (CD-MPs, < 5 μm) are components of the respirable CD. However, the differences in physicochemical properties and pulmonary toxicity between CD-NPs and CD-MPs remain unclear. METHODS CD was analyzed by scanning electron microscopy, Malvern nanoparticle size potentiometer, energy dispersive spectroscopy, infrared spectroscopy, and electron paramagnetic resonance spectroscopy. CCK-8 assay, ELISA, transmission electron microscope, JC-1 staining, reactive oxygen species activity probe, calcium ion fluorescent probe, AO/EB staining, flow cytometry, and western blot were used to determine the differences between CD-NPs and CD-MPs on acute pulmonary toxicity. CCK-8, scratch healing and Transwell assay, hematoxylin-eosin and Masson staining, immunohistochemistry, immunofluorescence, and western blot were applied to examine the effects of CD-NPs and CD-MPs on pneumoconiosis. RESULTS Analysis of the size distribution of CD revealed that the samples had been size segregated. The carbon content of CD-NPs was greater than that of CD-MPs, and the oxygen, aluminum, and silicon contents were less. In in vitro experiments with A549 and BEAS-2B cells, CD-NPs, compared with CD-MPs, had more inflammatory vacuoles, release of pro-inflammatory cytokines (IL-6, IL-1β, TNFα) and profibrotic cytokines (CXCL2, TGFβ1), mitochondrial damage (reactive oxygen species and Ca2+ levels and decreased mitochondrial membrane potential), and cell death (apoptosis, pyroptosis, and necrosis). CD-NPs-induced fibrosis model cells had stronger proliferation, migration, and invasion than did CD-MPs. In in vivo experiments, lung coefficient, alveolar inflammation score, and lung tissue fibrosis score (mean: 1.1%, 1.33, 1.33) of CD-NPs were higher than those of CD-MPs (mean: 1.3%, 2.67, 2.67). CD-NPs accelerated the progression of pulmonary fibrosis by upregulating the expression of pro-fibrotic proteins and promoting epithelial-mesenchymal transition. The regulatory molecules involved were E-cadherin, N-cadherin, COL-1, COL-3, ZO-1, ZEB1, Slug, α-SMA, TGFβ1, and Vimentin. CONCLUSIONS Stimulation with CD-NPs resulted in more pronounced acute and chronic lung toxicity than did stimulation with CD-MPs. These effects included acute inflammatory response, mitochondrial damage, pyroptosis, and necrosis, and more pulmonary fibrosis induced by epithelial-mesenchymal transition.
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Affiliation(s)
- Yinci Zhang
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China
| | - Amin Li
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China
| | - Jiafeng Gao
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China
| | - Jiaojiao Liang
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China
| | - Niandie Cao
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China
| | - Shuping Zhou
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China
- First Affiliated Hospital, Anhui University of Science & Technology, Huainan, 232001, China
| | - Xiaolong Tang
- Medical School, Anhui University of Science & Technology, Huainan, 232001, China.
- Institute of Environment-Friendly Materials and Occupational Health of Anhui University of Science and Technology, Wuhu, 241003, China.
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Zhang W, Hu Q, Jiang S, Wang L, Chai J, Mei J. Experimental study on coal dust wettability strengthened by surface active ionic liquids. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:46325-46340. [PMID: 35165845 DOI: 10.1007/s11356-022-19191-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
The water wettability of coal dust was very important for dust control when using water-based dust suppressant materials. The coal dust wettability strengthened by surface active ionic liquid was studied in this paper. The surface activity of ten ionic liquids with different anions Cl-, Br-, [BF4]-, [NTf2]- and cations [HOEtMIm]+, [Cnmim]+ (n = 4, 12, 14, 16) was studied by surface tension test. The water wettability of raw coal dust can be improved individually by adding ionic liquid to water or pre-treating coal dust by ionic liquids. The wettability of lignite was improved little, but that of bituminous coal and anthracite were improved much. The dual strengthened effects of ionic liquids on coal dust wettability were studied by the wetting results between ionic liquids solutions and ionic liquid-treated coal samples. The wettability of lignite can be strengthened under the combined action of [HOEtMIm][NTf2] and [C12MIm]Br, while other dual effects were not satisfactory. All ionic liquids combination had strengthened effects on the wettability of bituminous coal and anthracite, especially the [C12MIm]Br treatment and [C12MIm]Br solutions together had the best dual effects. The functional groups results indicated that the hydrophilic oxygen-containing functional groups in treated coal samples increased, the hydrophobic aliphatic hydrocarbon functional groups decreased and part of ionic liquids were adsorbed on the coal surface. These changes together enhanced the wettability of coal with high coalification degrees.
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Affiliation(s)
- Weiqing Zhang
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China.
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China.
| | - Qiang Hu
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
| | - Shuguang Jiang
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China.
- School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
| | - Li Wang
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
| | - Jun Chai
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
| | - Jingxin Mei
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
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20
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Sun L, Ge S, Liu S, Jing D, Chen X. Experimental and Molecular Dynamics Simulation Study for Preferring Coal Dust Wetting Agents. ACS OMEGA 2022; 7:17593-17599. [PMID: 35664608 PMCID: PMC9161254 DOI: 10.1021/acsomega.2c00038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 05/11/2022] [Indexed: 06/02/2023]
Abstract
To improve the efficiency of coal dust removal by water spray technology, the addition of wetting agents in water becomes the main dust removal method. The influence of sodium dodecyl sulfate (SDS), sodium dodecyl sulfonate (SDDS), and sodium dodecylbenzene sulfonate (SDBS) on the wettability of coal dust is studied by experimental and molecular dynamics (MD) simulation. Measurement of the contact angle and surface tension was accomplished via relevant experiments for the three wetting agents, and their adhesion work, spreading work, and wetting work were also calculated. A preferred experimental method of conventional coal dust wetting agent is optimized. The wettability of the three wetting agents upon bituminous coal follows the trend: SDS > SDDS > SDBS. The simulation was performed based on MD to derive the intermolecular interaction energy, diffusion coefficient of water molecules, and water molecule count in the vicinity of the hydrophilic groups of the wetting agents. The wetting mechanism and performance of the wetting agent solution on bituminous coal were identified. The simulation results of the wetting performance of the wetting agents are consistent with the experimental results, which verifies the reliability of the simulation method. An easy, time-saving, and labor-saving MD simulation method is proposed, which provides a novel insight for choosing various wetting agents of coal dust.
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Affiliation(s)
- Liying Sun
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030600, China
| | - Shaocheng Ge
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030600, China
| | - Shuo Liu
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030600, China
| | - Deji Jing
- Institute
of Safety Science and Technology, Liaoning
Technical University, Fuxin 123000, China
| | - Xi Chen
- College
of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030600, China
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21
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Li A, Zhang Y, Ma Y, Xu R, Song L, Cao W, Tang X. The effects of coal dust exposure on DNA damage and repair of human bronchial epithelial cells. Toxicol Ind Health 2022; 38:389-398. [PMID: 35624533 DOI: 10.1177/07482337221100483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
To explore the effects of coal dust exposure on DNA damage and repair, human bronchial epithelial BEAS-2B cells were exposed to coal dust and the cellular response was investigated. It was found that γ-H2AX foci of DNA damage appeared, γ-H2AX protein level increased, and the rate of cell apoptosis was significantly elevated when BEAS-2B cells were exposed to coal dust for a short time. Phagocytized coal dust particles, swollen mitochondria, and reduced mitochondrial membrane potential were simultaneously identified. Moreover, Caspase-9, Caspase-3, and DFF45 proteins of the mitochondrial apoptotic pathway were activated. After the cells were exposed to coal dust chronically, phosphorylation levels of DNA repair kinases (ATM/ATR, DNA-PKcs) and downstream regulatory protein AKT were significantly upregulated. γ-H2AX foci and tail DNA of the cells following treatment with cisplatin were also reduced, and the colony formation rate was improved. It was concluded that coal dust could induce DNA damage, cause mitochondrial depolarization, and activate mitochondrial apoptosis pathways in BEAS-2B cells. Additionally, activated DNA repair kinases (ATM/ATR and DNA-PKcs) and their regulatory protein AKT increased DNA repair and proliferation of BEAS-2B cells chronically exposed to coal dust.
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Affiliation(s)
- Amin Li
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Yinci Zhang
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Yongfang Ma
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Ruyue Xu
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Li Song
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Weiya Cao
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
| | - Xiaolong Tang
- Medical School, 91594Anhui University of Science & Technology, Huainan, China
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22
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Song Y, Southam K, Beamish BB, Zosky GR. Effects of chemical composition on the lung cell response to coal particles: Implications for coal workers' pneumoconiosis. Respirology 2022; 27:447-454. [PMID: 35306722 PMCID: PMC9314662 DOI: 10.1111/resp.14246] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/03/2022] [Accepted: 03/06/2022] [Indexed: 11/30/2022]
Abstract
Background and objective Coal mine dust has a complex and heterogeneous chemical composition. It has been suggested that coal particle chemistry plays a critical role in determining the pathogenesis of coal workers' pneumoconiosis (CWP). In this study, we aimed to establish the association between the detrimental cellular response and the chemical composition of coal particles. Methods We sourced 19 real‐world coal samples. Samples were crushed prior to use to minimize the impact of particle size on the response and to ensure the particles were respirable. Key chemical components and inorganic compounds were quantified in the coal samples. The cytotoxic, inflammatory and pro‐fibrotic responses in epithelial cells, macrophages and fibroblasts were assessed following 24 h of exposure to coal particles. Principal component analysis (PCA) and stepwise regression were used to determine which chemical components of the coal particles were associated with the cell response. Results The cytotoxic, inflammatory and pro‐fibrotic response varied considerably between coal samples. There was a high level of collinearity in the cell responses and between the chemical compounds within the coal samples. PCA identified three factors that explained 75% of the variance in the cell response. Stepwise multiple regression analysis identified K2O (p <0.001) and Fe2O3 (p = 0.011) as significant predictors of cytotoxicity and cytokine production, respectively. Conclusion Our data clearly demonstrate that the detrimental cellular effects of exposure to coal mine dusts are highly dependent on particle chemistry. This has implications for understanding the pathogenesis of CWP. To determine whether chemistry is a key determinant of the lung cell response to coal particles, we examined the correlation between the chemical constituents of 19 coal samples and cellular response. We identified K2O and Fe2O3 as the constituents of the coal associated with the greatest detrimental cell response.
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Affiliation(s)
- Yong Song
- Menzies Institute for Medical Research College of Health and Medicine, University of Tasmania Hobart Tasmania Australia
| | - Katherine Southam
- Menzies Institute for Medical Research College of Health and Medicine, University of Tasmania Hobart Tasmania Australia
| | | | - Graeme R. Zosky
- Menzies Institute for Medical Research College of Health and Medicine, University of Tasmania Hobart Tasmania Australia
- Tasmanian School of Medicine, College of Health and Medicine University of Tasmania Hobart Tasmania Australia
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23
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Hoy RF, Jeebhay MF, Cavalin C, Chen W, Cohen RA, Fireman E, Go LHT, León-Jiménez A, Menéndez-Navarro A, Ribeiro M, Rosental PA. Current global perspectives on silicosis-Convergence of old and newly emergent hazards. Respirology 2022; 27:387-398. [PMID: 35302259 PMCID: PMC9310854 DOI: 10.1111/resp.14242] [Citation(s) in RCA: 43] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 01/05/2022] [Indexed: 01/03/2023]
Abstract
Silicosis not a disease of the past. It is an irreversible, fibrotic lung disease specifically caused by exposure to respirable crystalline silica (RCS) dust. Over 20,000 incident cases of silicosis were identified in 2017 and millions of workers continue to be exposed to RCS. Identified case numbers are however a substantial underestimation due to deficiencies in reporting systems and occupational respiratory health surveillance programmes in many countries. Insecure workers, immigrants and workers in small businesses are at particular risk of more intense RCS exposure. Much of the focus of research and prevention activities has been on the mining sector. Hazardous RCS exposure however occurs in a wide range of occupational setting which receive less attention, in particular the construction industry. Recent outbreaks of silicosis associated with the fabrication of domestic kitchen benchtops from high‐silica content artificial stone have been particularly notable because of the young age of affected workers, short duration of RCS exposure and often rapid disease progression. Developments in nanotechnology and hydraulic fracking provide further examples of how rapid changes in technology and industrial processes require governments to maintain constant vigilance to identify and control potential sources of RCS exposure. Despite countries around the world dealing with similar issues related to RCS exposure, there is an absence of sustained global public health response including lack of consensus of an occupational exposure limit that would provide protection to workers. Although there are complex challenges, global elimination of silicosis must remain the goal. See relatedEditorial
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Affiliation(s)
- Ryan F Hoy
- School of Public Health and Preventive Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria, Australia.,Department of Respiratory Medicine, The Alfred Hospital, Prahran, Victoria, Australia
| | - Mohamed F Jeebhay
- Occupational Medicine Division and Centre for Environmental & Occupational Health Research, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
| | - Catherine Cavalin
- CNRS (IRISSO, UMR CNRS-INRAE 7170-1427), Université Paris-Dauphine, PSL, Soutien à la mobilité internationale (SMI) du CNRS, Paris, France.,Madrid Institute for Advanced Study (MIAS), Madrid, Spain.,Interdisciplinary Laboratory for the Evaluation of Public Policies, LIEPP, Sciences Po, Paris, France.,Employment and Labour Research Centre, CNAM, Noisy-le-Grand, France
| | - Weihong Chen
- Key Laboratory of Environment and Health, Ministry of Education and Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Robert A Cohen
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.,Environmental and Occupational Health Sciences Division, School of Public Health, University of Illinois Chicago, Chicago, Illinois, USA
| | - Elizabeth Fireman
- Institute of Pulmonary and Allergic Diseases, Tel-Aviv Sourasky Medical Center, Tel Aviv, Israel.,Department Occupational Environmental Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Leonard H T Go
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.,Environmental and Occupational Health Sciences Division, School of Public Health, University of Illinois Chicago, Chicago, Illinois, USA
| | - Antonio León-Jiménez
- Pulmonology, Allergy and Thoracic Surgery Department, Puerta del Mar University Hospital, Cádiz, Spain
| | | | - Marcos Ribeiro
- Pulmonary Department, Universidade Estadual de Londrina: Londrina, Paraná, Brazil
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24
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Fang X, Jiang B, Yuan L, Liang Y, Ren B, Tao W, Li X. Experimental Study on Atomization Characteristics of Gas-Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect. MATERIALS 2022; 15:ma15020565. [PMID: 35057283 PMCID: PMC8777894 DOI: 10.3390/ma15020565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 01/27/2023]
Abstract
An experimental study on the flow rate and atomization characteristics of a new gas–liquid two-phase flow nozzle was carried out to use high-concentration respirable dust in the workplace of high-efficiency sedimentation coal production based on the gas–liquid two-phase flow nozzle technology. The simulation roadway of dust fall in large coal mines was constructed, and the respirable rock dust produced by fully mechanized mining surfaces was chosen as the research object. The effects of humidity on the capture effect of respirable rock dust were analyzed in the experimental study. The results demonstrated that: (1) the distribution range of the particle size of fogdrops declines with the reduction in fogdrops D50, D[3,2] and D[4,3], which are produced by gas–liquid two-phase flow nozzles. (2) The initial ambient humidity in the simulated roadway was 64.8% RH. After the gas–liquid two-phase flow spray was started, the ambient humidity was elevated by 23.2 to 23.5% RH within 840s and tended to be stable and no longer grew after reaching 88.0–88.3% RH. The initial growth rate of the ambient humidity in the simulated roadway was high, and then was gradually slowed down. (3) Humidity is an important factor influencing the collection of respirable dust. The humidity at 10.0 m leeward of the dust-producing point was increased by 19.6% RH, and the sedimentation rate of respirable dust was increased by 6.73%; the two growth rates were 13.1% RH and 9.90% at 20.0 m; 16.4% RH and 15.42% at 30.0 m; 18.4% RH and 11.20% at 40.0 m. In practical applications of the gas–liquid two-phase flow nozzle in coal mining activities, attention shall be paid to not only the influences of its atomization characteristics on the capture effect of respirable dust but also the influences of the flow rate of the nozzle on the humidity of the working surface. Appropriate gas and water supply pressures shall be chosen according to the space and respirable dust concentration on the working surface to realize a better dust removal effect.
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Affiliation(s)
- Xueming Fang
- Key Laboratory of Industrial Dust Control and Occupational Health, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; (X.F.); (W.T.)
- National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China
| | - Bingyou Jiang
- Key Laboratory of Industrial Dust Control and Occupational Health, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; (X.F.); (W.T.)
- National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China
- Correspondence: (B.J.); (L.Y.)
| | - Liang Yuan
- Key Laboratory of Industrial Dust Control and Occupational Health, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; (X.F.); (W.T.)
- National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China
- Correspondence: (B.J.); (L.Y.)
| | - Yuxiang Liang
- Guangdong Heer Environmental Technology Co., Ltd., Foshan 528000, China;
| | - Bo Ren
- School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing 100083, China;
- Coal Mining National Engineering Technology Research Institute, Huainan 232001, China
| | - Wenhan Tao
- Key Laboratory of Industrial Dust Control and Occupational Health, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; (X.F.); (W.T.)
- National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China
| | - Xianbao Li
- Pingxiang Anyuan Ventilation Equipment Co., Ltd., Pingxiang 337000, China;
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25
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Mei X, Zeng C, Gong G. Predicting indoor particle dispersion under dynamic ventilation modes with high-order Markov chain model. BUILDING SIMULATION 2022; 15:1243-1258. [PMID: 34849189 PMCID: PMC8612721 DOI: 10.1007/s12273-021-0855-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/28/2021] [Accepted: 10/18/2021] [Indexed: 05/05/2023]
Abstract
Mechanical and natural ventilations are effective measures to remove indoor airborne contaminants, thereby creating improved indoor air quality (IAQ). Among various simulation techniques, Markov chain model is a relatively new and efficient method in predicting indoor airborne pollutants. The existing Markov chain model (for indoor airborne pollutants) is basically assumed as first-order, which however is difficult to deal with airborne particles with non-negligible inertial. In this study, a novel weight-factor-based high-order (second-order and third-order) Markov chain model is developed to simulate particle dispersion and deposition indoors under fixed and dynamic ventilation modes. Flow fields under various ventilation modes are solved by computational fluid dynamics (CFD) tools in advance, and then the basic first-order Markov chain model is implemented and validated by both simulation results and experimental data from literature. Furthermore, different groups of weight factors are tested to estimate appropriate weight factors for both second-order and third-order Markov chain models. Finally, the calculation process is properly designed and controlled, so that the proposed high-order (second-order) Markov chain model can be used to perform particle-phase simulation under consecutively changed ventilation modes. Results indicate that the proposed second-order model does well in predicting particle dispersion and deposition under fixed ventilation mode as well as consecutively changed ventilation modes. Compared with traditional first-order Markov chain model, the proposed high-order model performs with more reasonable accuracy but without significant computing cost increment. The most suitable weight factors of the simulation case in this study are found to be (λ1 = 0.7, λ2 = 0.3, λ3 = 0) for second-order Markov chain model, and (λ1 = 0.8, λ2 = 0.1, λ3 = 0.1) for third-order Markov chain model in terms of reducing errors in particle deposition and escape prediction. With the improvements of the efficiency of state transfer matrix construction and flow field data acquisition/processing, the proposed high-order Markov chain model is expected to provide an alternative choice for fast prediction of indoor airborne particulate (as well as gaseous) pollutants under transient flows.
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Affiliation(s)
- Xiong Mei
- School of Energy and Power Engineering, Changsha University of Science and Technology, 960 Wanjiali South Road, Changsha, 410114 China
| | - Chenni Zeng
- School of Energy and Power Engineering, Changsha University of Science and Technology, 960 Wanjiali South Road, Changsha, 410114 China
| | - Guangcai Gong
- School of Civil Engineering, Hunan University, 2 Lushan South Road, Changsha, 410082 China
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26
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Trechera P, Moreno T, Córdoba P, Moreno N, Amato F, Cortés J, Zhuang X, Li B, Li J, Shangguan Y, Dominguez AO, Kelly F, Mhadhbi T, Jaffrezo JL, Uzu G, Querol X. Geochemistry and oxidative potential of the respirable fraction of powdered mined Chinese coals. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 800:149486. [PMID: 34391157 DOI: 10.1016/j.scitotenv.2021.149486] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/29/2021] [Accepted: 08/02/2021] [Indexed: 06/13/2023]
Abstract
This study evaluates geochemical and oxidative potential (OP) properties of the respirable (finer than 4 μm) fractions of 22 powdered coal samples from channel profiles (CP4) in Chinese mined coals. The CP4 fractions extracted from milled samples of 22 different coals were mineralogically and geochemically analysed and the relationships with the OP evaluated. The evaluation between CP4/CP demonstrated that CP4 increased concentrations of anatase, Cs, W, Zn and Zr, whereas sulphates, Fe, S, Mo, Mn, Hf and Ge decreased their CP4 concentrations. OP results from ascorbic acid (AA), glutathione (GSH) and dithiothreitol (DTT) tests evidenced a clear link between specific inorganic components of CP4 with OPAA and the organic fraction of OPGSH and OPDTT. Correlation analyses were performed for OP indicators and the geochemical patterns of CP4. These were compared with respirable dust samples from prior studies. They indicate that Fe (r = 0.83), pyrite (r = 0.66) and sulphate minerals (r = 0.42) (tracing acidic species from pyrite oxidation), followed by S (r = 0.50) and ash yield (r = 0.46), and, to a much lesser extent, Ti, anatase, U, Mo, V and Pb, are clearly linked with OPAA. Moreover, OPGSH correlation was identified by organic matter, as moisture (r = 0.73), Na (r = 0.56) and B (r = 0.51), and to a lesser extent by the coarse particle size, Ca and carbonate minerals. In addition, Mg (r = 0.70), B (r = 0.47), Na (r = 0.59), Mn, Ba, quartz, particle size and Sr regulate OPDTT correlations. These became more noticeable when the analysis was done for samples of the same type of coal rank, in this case, bituminous.
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Affiliation(s)
- Pedro Trechera
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain; Department of Natural Resources and Environment, Industrial and TIC Engineering (EMIT-UPC), 08242 Manresa, Spain.
| | - Teresa Moreno
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain
| | - Patricia Córdoba
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain
| | - Natalia Moreno
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain
| | - Fulvio Amato
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain
| | - Joaquim Cortés
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain
| | - Xinguo Zhuang
- Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China
| | - Baoqing Li
- Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China
| | - Jing Li
- Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China
| | - Yunfei Shangguan
- Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China
| | - Ana Oliete Dominguez
- MRC-PHE Centre for Environment and Health, King's College London, London SE1 9NH, UK
| | - Frank Kelly
- MRC-PHE Centre for Environment and Health, King's College London, London SE1 9NH, UK
| | - Takoua Mhadhbi
- Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE (UMR 5001), 38000 Grenoble, France
| | - Jean Luc Jaffrezo
- Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE (UMR 5001), 38000 Grenoble, France
| | - Gaelle Uzu
- Univ. Grenoble Alpes, IRD, CNRS, Grenoble INP, IGE (UMR 5001), 38000 Grenoble, France
| | - Xavier Querol
- Institute of Environmental Assessment and Water Research (IDAEA), Spanish Research Council (CSIC), 08034 Barcelona, Spain; Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China.
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27
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Yan S, Huang Q, Qin C, Wang G, Li H, Fan J. Experimental study of wetting-seepage effect of microemulsion for the coal seam water injection. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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