Process Safety and Environmental Protection最新文献

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Unsaturated Fe centers of 2D MOFs mediated the efficient Fenton-like reaction for organic pollutant elimination 二维 MOFs 的不饱和铁中心介导了高效的 Fenton-like 反应以消除有机污染物
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-06 DOI: 10.1016/j.psep.2024.11.023
Siqi Wu , Xiaoyun He , Guanlong Wang, Xiaoli Dong, Xiufang Zhang
{"title":"Unsaturated Fe centers of 2D MOFs mediated the efficient Fenton-like reaction for organic pollutant elimination","authors":"Siqi Wu ,&nbsp;Xiaoyun He ,&nbsp;Guanlong Wang,&nbsp;Xiaoli Dong,&nbsp;Xiufang Zhang","doi":"10.1016/j.psep.2024.11.023","DOIUrl":"10.1016/j.psep.2024.11.023","url":null,"abstract":"<div><div>Fe-based metal-organic frameworks (Fe-MOFs) are currently regarded as a promising candidate for heterogeneous Fenton-like reactions to eliminate organic contaminants in wastewater. However, improving the cycling rate of Fe(II)/Fe(III) to create a highly efficient heterogeneous Fenton-like system continues to be a challenge. Here, we prepared 2D MIL-88B(Fe)-NO<sub>2</sub> by a facile approach. 2D MIL-88B(Fe)-NO<sub>2</sub> has a higher capacity to degrade pollutants than 3D MIL-88B(Fe)-NO<sub>2</sub>, 2D-M30 showed the best Fenton-like performance in particular, with a phenol removal rate of approximately 97.2 % within 6 min and a kinetic degradation constant of 0.57 min<sup>−1</sup>. The phosphate addition experiment confirmed that the unsaturated coordination Fe on 2D MIL-88B(Fe)-NO<sub>2</sub> was the main active site for H<sub>2</sub>O<sub>2</sub> activation. Additionally, it can be concluded by CO adsorption in-situ infrared spectra and specific surface area measurement that 2D MIL-88B(Fe)-NO<sub>2</sub> has more unsaturated coordinated Fe than MIL-88B(Fe)-NO<sub>2</sub>. The outstanding Fenton-like catalytic efficiency was attributed to the defects of metal node coordination sites at the 2D MOFs. Furthermore, the electron cloud density of Fe(III) decreased due to the unsaturation of the coordinated Fe, which encourages the transition of Fe(II)/Fe(III). This approach provides innovative ideas for the logical design and creation of efficient heterogeneous Fenton-like catalysts.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"192 ","pages":"Pages 1382-1392"},"PeriodicalIF":6.9,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Isolation of halotolerant Pseudomonas sp. KW-2 for the effective degradation p-arsanilic acid and immobilization its released inorganic arsenic 分离耐卤假单胞菌 KW-2 以有效降解对胂酸并固定其释放的无机砷
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-06 DOI: 10.1016/j.psep.2024.11.021
Huawei Wang , Rongxue Zou , Xutong Jiang , Ya-nan Wang , Xueqin Wang , Yingjie Sun , Shupeng Li , Yujun Wang
{"title":"Isolation of halotolerant Pseudomonas sp. KW-2 for the effective degradation p-arsanilic acid and immobilization its released inorganic arsenic","authors":"Huawei Wang ,&nbsp;Rongxue Zou ,&nbsp;Xutong Jiang ,&nbsp;Ya-nan Wang ,&nbsp;Xueqin Wang ,&nbsp;Yingjie Sun ,&nbsp;Shupeng Li ,&nbsp;Yujun Wang","doi":"10.1016/j.psep.2024.11.021","DOIUrl":"10.1016/j.psep.2024.11.021","url":null,"abstract":"<div><div><em>p</em>-arsanilic acid (<em>p</em>-ASA) contamination in highly saline environments has received increasing attention; however, <em>p</em>-ASA removal by salt-tolerant Mn(II)-oxidizing bacteria (MnOB) has not yet been reported. In this study, a salt-tolerant Mn(II)-oxidizing bacterium, <em>Pseudomonas</em> sp. KW-2, was isolated, and its capacity to efficiently oxidize Mn(II), form biogenic Mn oxides (BMO) and remove <em>p</em>-ASA was evaluated. Batch experiments indicated that KW-2 had good Mn(II) oxidation capacity (BMO∼100 μM) when the salinity of the medium ranged from 15.00 g/L to 55.00 g/L. Strain KW-2 exhibited strong <em>p</em>-ASA removal efficiency (80.38 %) via <em>in situ</em>-formed BMO when the initial concentration of <em>p</em>-ASA was 5.00 mg/L. <em>p</em>-ASA removal by strain KW-2 was driven primarily by the oxidation of BMO (84.45 %), and the released inorganic arsenic major entered the crystal structure of the BMO precipitates. This study provides a feasible method for the bioremediation of <em>p</em>-ASA in high-salt environments.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"192 ","pages":"Pages 1271-1282"},"PeriodicalIF":6.9,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on dynamic well control in riserless mud recovery system 无隔水管泥浆回收系统中的动态井控研究
IF 7.8 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-06 DOI: 10.1016/j.psep.2024.10.125
Gezhen Mao, Jie Zhang
{"title":"Research on dynamic well control in riserless mud recovery system","authors":"Gezhen Mao, Jie Zhang","doi":"10.1016/j.psep.2024.10.125","DOIUrl":"https://doi.org/10.1016/j.psep.2024.10.125","url":null,"abstract":"In order to promote the development of RMR (Riserless Mud Recovery) system well control technology and ensure the safe operation of deep water drilling operations, the overflow control equation of RMR system considering the lifting force of subsea pump is established and verified, the conventional overflow monitoring method and the overflow monitoring method based on subsea pump parameter variation are compared and analyzed. the dynamic well control process of the RMR system after overflow under the two modes of constant subsea pump displacement and constant inlet pressure of subsea pump is simulated, and the influencing factors of inlet pressure of subsea pump are further analyzed. The results show that although the temperature effect is taken into account in the model established in this paper, the time error of the mud pool increment, the inlet pressure and the displacement of subsea pump after reaching the overflow criterion is less than 22.5 % compared with Froyen's model. The conventional overflow monitoring method has fast response and small change, while the overflow monitoring method based on subsea pump parameter change is on the contrary, and the two should be used together. Both the constant inlet pressure of subsea pump mode and the constant subsea pump displacement mode can control overflow, but from the stability of subsea pump, service life and well control safety, the constant displacement mode is better. In the case of large formation pressure, low drilling fluid density, overflow criteria and circulating displacement, the pressure response adjustment speed of the subsea pump inlet is faster, and the back pressure load of the subsea pump inlet can be effectively alleviated by appropriately increasing the circulating displacement and drilling fluid density. This study has enriched the theoretical system of RMR system in overflow control, and has certain guiding significance for the development of deepwater and ultra-deepwater drilling safety technology.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"5 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring experimental tests concerning liquid hydrogen releases 探索有关液氢释放的实验测试
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.014
Federica Tamburini , Martin Kluge , Abdel Karim Habib , Federico Ustolin , Valerio Cozzani , Nicola Paltrinieri
{"title":"Exploring experimental tests concerning liquid hydrogen releases","authors":"Federica Tamburini ,&nbsp;Martin Kluge ,&nbsp;Abdel Karim Habib ,&nbsp;Federico Ustolin ,&nbsp;Valerio Cozzani ,&nbsp;Nicola Paltrinieri","doi":"10.1016/j.psep.2024.11.014","DOIUrl":"10.1016/j.psep.2024.11.014","url":null,"abstract":"<div><div>In recent years, the adoption of liquid hydrogen (LH<sub>2</sub>) has increased significantly in industrial and transport applications, driven by its low carbon footprint, thereby aiding the fight against global warming. Additionally, its high volumetric energy density, compared to gaseous or compressed hydrogen, enhances hydrogen storage capabilities. However, safety remains a major concern due to its physical-chemical properties and inherent hazardous characteristics, especially in the event of spillage scenarios. Therefore, to better understand the consequences of LH<sub>2</sub> releases onto or into water, large-scale experimental tests were conducted by Bundesanstalt für Materialforschung und -prüfung (BAM) within the Safe Hydrogen Fuel Handling and Use for Efficient Implementation (SH<sub>2</sub>IFT) project at the Test Site Technical Safety of BAM, comprising 75 single spill events at varied release rates and orientations. While the rapid phase transition (RPT) phenomenon was not observed, self-ignition of the hydrogen-air cloud occurred, accompanied by blast wave overpressure and heat radiation, without a discernible ignition source. These findings emphasize the need for further investigation into LH<sub>2</sub> safety. Leveraging experimental data for real-world applications provides insights into safe LH<sub>2</sub> infrastructure implementation, laying foundational knowledge for addressing safety challenges and advancing LH<sub>2</sub> technology.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"192 ","pages":"Pages 1330-1343"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Valorization of dairy waste scum oil and rice husk ash-supported CuO nanocatalyst towards cleaner production of biodiesel: A waste-to-energy approach 奶制品废渣油和稻壳灰支持的 CuO 纳米催化剂的价值化,以实现生物柴油的清洁生产:废物变能源方法
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.10.124
Basir Maleki , Hossein Esmaeili , Yatish Kalanakoppal Venkatesh , Amruth E
{"title":"Valorization of dairy waste scum oil and rice husk ash-supported CuO nanocatalyst towards cleaner production of biodiesel: A waste-to-energy approach","authors":"Basir Maleki ,&nbsp;Hossein Esmaeili ,&nbsp;Yatish Kalanakoppal Venkatesh ,&nbsp;Amruth E","doi":"10.1016/j.psep.2024.10.124","DOIUrl":"10.1016/j.psep.2024.10.124","url":null,"abstract":"<div><div>This study surveys the valorization of dairy waste scum oils (DWSO) to synthesis biodiesel using a novel rice husk ash-supported CuO nanocatalyst. The rice husk ash-supported CuO nanocatalyst was synthesized through a facile impregnation method and characterized by BET, XRD, FTIR, EDX, CO<sub>2</sub>/TPD, TEM, and FESEM to confirm its structural and morphological features. Transesterification of DWSO was conducted under optimized conditions, achieving a maximum biodiesel yield of 97.42 % at temperature of 62.36°C, methanol/DWSO proportion of 11:12, and nanocatalyst loading of 2.76 wt% within 2.85 h. Kinetic studies revealed that the transesterification reaction follows a pseudo-first-order model with an activation energy of 100.34 kJ/mol. Thermodynamic analysis indicated that the reaction is endothermic (ΔH = 100.26 kJ/mol) and non-spontaneous (ΔG = −11043.6 kJ/mol) at the studied temperature range, suggesting the requirement of external heat to drive the process. Reusability tests demonstrated that the rice husk ash-supported CuO nanocatalyst retains over 86 % of its initial activity after seven cycles, highlighting its potential for practical applications. This study highlights the dual benefits of utilizing agro-industrial waste for both feedstock and catalyst support, promoting a cleaner and economically viable approach for biodiesel generation.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"192 ","pages":"Pages 1393-1407"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Revisiting the persulfate activation performance of seaweed derived biochars: The composition and origin of pollutant degradation activity 重新审视海藻生物炭的过硫酸盐活化性能:污染物降解活性的组成和来源
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.017
Sivasankar Annamalai , Alam Venugopal Narendra Kumar , Won Sik Shin
{"title":"Revisiting the persulfate activation performance of seaweed derived biochars: The composition and origin of pollutant degradation activity","authors":"Sivasankar Annamalai ,&nbsp;Alam Venugopal Narendra Kumar ,&nbsp;Won Sik Shin","doi":"10.1016/j.psep.2024.11.017","DOIUrl":"10.1016/j.psep.2024.11.017","url":null,"abstract":"<div><div>A steady increase in seaweed production necessitates effective strategies to manage its post-production waste and its associated CO<sub>2</sub> emission. Biochar formation stand out as a promising option, offering significant advantage for persulfate-activated water remediation processes. Herein, we investigated and compared the performance of two seaweed-derived biochars, focusing on their physical characteristics, heteroatoms, and chemical composition in activating persulfate (PS). Although, both seaweeds (<em>Capsosiphon fulvescens</em> (CF) and <em>Undaria pinnatifida</em> (SW)) that studied are edible, they exhibit unique catalytic activity towards simazine (SIM) degradation. The differences in SIM degradation activity observed in these biochars were primarily attributed to the description of metal active sites rather than its chemical composition and specific surface area of the biochars. The identification of these active sites was achieved through various physical characterization tools (XRD, XPS, BET) and by examining the adsorption models and degradation patterns of simazine under different conditions. Our results demonstrate that the biochar derived from CF (100 % removal) seaweed having metal active centres is more catalytic than SW (58.4 % removal) derived biochar. ROS quantification and electrochemical studies suggest that simazine degradation occurs through different mechanisms in these biochars. Therefore, the CF-derived biochar catalytic system was optimized for simazine oxidation, with studies focusing on its degradation pathway, intermediate toxicity, and catalytic stability. Thus, the present study outlines the significance of seaweed biomass selection for optimal catalytic activity in the persulfate-based oxidative process.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"193 ","pages":"Pages 195-204"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synergistic effects of bamboo biochar and ammonia oxidizing bacteria on nitrogen transformation and microbial dynamics during vermicomposting of green waste and chicken manure 竹生物炭和氨氧化细菌对绿化废弃物和鸡粪蚯蚓堆肥过程中氮转化和微生物动态的协同效应
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.015
Lin Jin , Zeb Azhar , Mengqin Luo , Xiaoqiang Gong
{"title":"Synergistic effects of bamboo biochar and ammonia oxidizing bacteria on nitrogen transformation and microbial dynamics during vermicomposting of green waste and chicken manure","authors":"Lin Jin ,&nbsp;Zeb Azhar ,&nbsp;Mengqin Luo ,&nbsp;Xiaoqiang Gong","doi":"10.1016/j.psep.2024.11.015","DOIUrl":"10.1016/j.psep.2024.11.015","url":null,"abstract":"<div><div>This study aims to explore the impact of bamboo biochar or/and ammonia-oxidizing bacteria on the nitrogen transformation and microbial dynamic factors during green waste and chicken manure co-vermicomposting. The results revealed that the addition of bamboo biochar combined with microbial agents significantly improved the overall quality and maturity of vermicompost by enhancing organic matter degradation, humus formation, humic-fulvic acid ratio, carbon-to-nitrogen ratios and germination index. The combined addition led to a substantial reduction in ammonia emissions (67.96 %) along with a notable increase in nitrate nitrogen (79.01 %) and total nitrogen (22.49 %) accumulation. Moreover, jointly adding bamboo biochar and microbial agents enriched the level of ammonifying bacteria <em>Nitrosospira</em> and <em>Nitrosomonas</em> and increased the activities of ammonia monooxygenase, hydroxylamine oxidase, and nitrate oxidoreductase. Furthermore, the combined addition enriched the beneficial bacteria, such as <em>Cellvibrio, Pseudomonas</em>, <em>Nonomuraea</em>, <em>Pseudoxanthomonas</em>, etc., which are involved in organic matter degradation and phosphorus transformation, while inhibiting denitrifying bacteria. Therefore, this study recommends the co-addition of bamboo biochar and microbial agents as an effective approach to improve vermicompost quality and inhibit nitrogen loss during green waste and chicken manure vermicomposting.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"193 ","pages":"Pages 115-124"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flame propagation analyses of aluminium coated with various concentrations of stearic acid based upon elementary reaction simulation 基于基本反应模拟的涂有不同浓度硬脂酸的铝的火焰传播分析
IF 7.8 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.007
Rui Guo, Yuxiong Huang, Xinyan Zhang, Yansong Zhang, Chang Xu, Yanjie Niu, Jiang Qin
{"title":"Flame propagation analyses of aluminium coated with various concentrations of stearic acid based upon elementary reaction simulation","authors":"Rui Guo, Yuxiong Huang, Xinyan Zhang, Yansong Zhang, Chang Xu, Yanjie Niu, Jiang Qin","doi":"10.1016/j.psep.2024.11.007","DOIUrl":"https://doi.org/10.1016/j.psep.2024.11.007","url":null,"abstract":"Coated aluminium, a novel material, has been employed in a multitude of applications. However, the thermal physicochemical properties of certain coated materials can elevate the ignition sensitivity and exacerbate explosion hazard of coated aluminium powder, posing serious thermal risks throughout the production, processing and storage. To render a theoretical basis for the prevention and mitigation of stearic acid-aluminium (SA-Al) dust explosion accidents, the flame propagation and elementary reaction sensitivity characteristics of SA-Al dust with various stearic acid concentrations were analysed by experiment and numerical simulation. Results showed that as the SA coating concentration increased from 0 % to 20 %, the flame propagation behaviour changed from dust-driven to gas-driven combustion, the flame luminous intensity and temperature abated gradually, and the average flame propagation velocities and free radical accumulation tended to first increase and then decrease, reaching maximum value in the 10 % SA-Al explosion. There may be synergistic combustion effect during Al cores and SA coating, which reflected in that a series of branch chain reactions of H and OH of SA in the initial combustion stage resulted in the accelerating melting and the forward explosion reaction kinetics of Al cores. Concurrently, the accelerated combustion of Al intensified the pyrolysis and oxidation of unburned SA-Al particles.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"190 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Air leakage mechanism and hole sealing technology in directional long-drilled perimeter rock-borehole composite fissures: for Gas enrichment in varying coal-seam thickness change areas 定向长钻围岩-钻孔复合裂隙的漏气机理与封孔技术:用于不同煤层厚度变化区域的瓦斯富集
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.012
Xuexi Chen , Peixue Han , Jiaying Hu , Tao Yang , Aitao Zhou , Jihong Sun
{"title":"Air leakage mechanism and hole sealing technology in directional long-drilled perimeter rock-borehole composite fissures: for Gas enrichment in varying coal-seam thickness change areas","authors":"Xuexi Chen ,&nbsp;Peixue Han ,&nbsp;Jiaying Hu ,&nbsp;Tao Yang ,&nbsp;Aitao Zhou ,&nbsp;Jihong Sun","doi":"10.1016/j.psep.2024.11.012","DOIUrl":"10.1016/j.psep.2024.11.012","url":null,"abstract":"<div><div>The issue of gas enrichment in the tectonic zone of coal seams, which poses significant threats to coal mine safety and leads to gas disasters, is primarily addressed through borehole extraction. The quality of this extraction is notably influenced by air leakage and sealing technologies used during drilling. To tackle the problem of gas leakage in directional long boreholes within the floor, a composite fissure leakage model for the surrounding rock and borehole is developed. This model inverts the characteristics of coal seam thickness variations and abnormal gas enrichment through heterogeneous geostatistical modeling. It enables the quantitative characterization of the air leakage mechanism in directional long boreholes of the bottom plate and proposes an effective sealing process. Due to damage and disturbance, fissures and irregular plastic zones form around the excavated roadway, which are major contributors to air leakage. Over time, the air content in the coal and rock seams gradually increases while the gas content and concentration decrease continuously. Compared to the polyurethane \"two plugs and one injection\" sealing process, the multi-stage grouting and sealing process provides a more stable gas extraction concentration and flow rate in the sealed drill holes. This process effectively seals the fissure zones of the roadway, reduces air leakage from the boreholes, and improves gas extraction concentration.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"192 ","pages":"Pages 1367-1381"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microfibers release during washing and, removal by tamarind fruit shell carbon filters: Subsequent utilization in crystal violet dye removal from water 微纤维在洗涤和罗望子果壳碳过滤器去除过程中释放出来:随后用于去除水中的水晶紫染料
IF 6.9 2区 环境科学与生态学
Process Safety and Environmental Protection Pub Date : 2024-11-05 DOI: 10.1016/j.psep.2024.11.011
M. Prabhakaran , T.G. Sunitha , Kiyoshi Omine , V. Sivasankar
{"title":"Microfibers release during washing and, removal by tamarind fruit shell carbon filters: Subsequent utilization in crystal violet dye removal from water","authors":"M. Prabhakaran ,&nbsp;T.G. Sunitha ,&nbsp;Kiyoshi Omine ,&nbsp;V. Sivasankar","doi":"10.1016/j.psep.2024.11.011","DOIUrl":"10.1016/j.psep.2024.11.011","url":null,"abstract":"<div><div>The release of synthetic microfibers (MFs) into the environment has been correlated to the laundering of clothes due to mechanical and chemical stresses preferably during hand washing based on conventional brushing practices. At this juncture, the present research explores the possible release of MFs in water by brush washing experiments on nylon and polyester clothes using four different quality brushes. The ejection of MFs from fabric as a function of brushing time (1 – 4 h), brushing area, quality of brushes and cloth type was investigated. The lengths of MFs were dominated mostly in the range of 100 – 200 μm and 200 – 400 μm along with the presence of microplastics (MPs) as threads, tubules and granules. The fabric materials were characterized using Fourier – Transform Infrared (FTIR) and Scanning Electron Microscope (SEM) with Elemental Dispersive Spectroscopy (EDS) techniques before and after the brush washing experiments. The pyrolysis Gas Chromatography – Time of Flight – Mass Spectroscopic (Py – GC-ToF-MS) study was performed to analyse the pyrolyzate products from the extracted MFs and MPs. Furthermore, the study was further extended into the abatement of MFs/MPs in wastewater samples discharged from the brush washing studies using acid washed tamarind fruit carbon (ATFSC) by columnar technique. The total time of 186 h at a flow rate of 1.7 mL per minute was spent for treating 19 L of wastewater samples with 3480 MFs (WW – 1) and 2858 MFs (WW – 2) as a consequence of brush washing experiments. It was apparent from the microscopic examination that the MFs remain undetectable till 12.24 litres of wastewater (1 &amp; 2) samples which passed through the column for 120 h. The ATFSC (AT) resulting after the filtration followed by thermal treatment was converted as barium alginate/carbon composites. These composites were found efficient in removing 83 % of crystal violet from aqueous solution at pH 7.97 for an equilibrium time of 90 min. The corresponding adsorption kinetics revealed the compliance of pseudo – second – order model with respect to domination of chemical forces during sorption. The present research not only explores the elimination of MFs/MPs from wastewater but also the possible conversion in the form of carbon composites followed by application in the removal of crystal violet from water.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"193 ","pages":"Pages 132-147"},"PeriodicalIF":6.9,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142643138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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