4,317 results match your criteria coal combustion

Personal exposure to fine particulate matter and blood pressure: Variations by particulate sources.

Chemosphere 2021 Oct 27;280:130602. Epub 2021 Apr 27.

School of Public Health, Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, Fudan University, Shanghai, China; Key Laboratory of Reproduction Regulation of National Population and Family Planning Commission, Shanghai Institute of Planned Research, Institute of Reproduction and Development, Fudan University, Shanghai, China. Electronic address:

Fine particulate matter (PM) is a complex mixture of components which has been associated with various cardiovascular effects, such as elevated blood pressure (BP). However, evidences on specific sources behind these effects remain uncertain. Based on 140 72-h personal measurements among a panel of 36 health college students in Shanghai, China, we assessed associations between source-apportioned PM exposure and BP changes. Read More

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October 2021

Preferential Recovery of Rare-Earth Elements from Coal Fly Ash Using a Recyclable Ionic Liquid.

Environ Sci Technol 2021 Jun 23. Epub 2021 Jun 23.

School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Recent global geopolitical tensions have exacerbated the scarcity of rare-earth elements (REEs), which are critical across many industries. REE-rich coal fly ash (CFA), a coal combustion residual, has been proposed as a potential source. Conventional REE-CFA recovery methods are energy- and material-intensive and leach elements indiscriminately. Read More

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Deep CCS: Moving Beyond 90% Carbon Dioxide Capture.

Environ Sci Technol 2021 Jun 23. Epub 2021 Jun 23.

Corporate Strategic Research, ExxonMobil Research and Engineering Company, Annandale, New Jersey 08801, United States.

The large-scale deployment of carbon capture technologies is expected to play a crucial role in efforts to meet stringent climate targets set forth by the Paris Agreement, but current models rely heavily upon carbon dioxide removal (CDR) strategies for which viability at the gigatonne scale is uncertain. While most 1.5 and 2 °C scenarios project rapid decarbonization of the energy sector facilitated by carbon capture and sequestration (CCS), they generally assume that CCS units can only capture ∼90% of the CO in coal and natural gas combustion flues because this was previously considered the optimal condition for aqueous amine scrubbers. Read More

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The in-situ effect of HS on the decomposition of natural rubber and catalyst activity.

Chemosphere 2021 Jun 18;283:131252. Epub 2021 Jun 18.

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 430074, Wuhan, Hubei, China.

In this work, the pyrolysis of natural rubber (NR) under N and HS atmosphere was performed to illustrate the possible effect of HS on NR decomposition with and without catalysts. A molecular dynamics simulation based on reactive force field (ReaxFF) was also conducted to understand the interaction mechanism between HS and intermediates from NR decomposition. Furthermore, the catalytic decomposition of NR under HS atmosphere and the adsorption characteristics of HS by zeolites alone were also carried out to investigate the effect of catalysts on sulfur behavior and the reversed effect of HS on catalyst activity. Read More

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On the state of the art of crystalline structure reconstruction of coal fly ash: A focus on zeolites.

Chemosphere 2021 Jun 8;283:131010. Epub 2021 Jun 8.

School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address:

Coal fly ash (CFA) is fine particles generated from coal combustion, and large amount of CFA causes environmental pollution. Traditionally, CFA is added into construction materials, which has realized effective reduction. As the exploration of CFA properties goes deeper, finer utilization has been studied to maximize the recycling of CFA. Read More

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Economy and carbon emissions optimization of different countries or areas in the world using an improved Attention mechanism based long short term memory neural network.

Sci Total Environ 2021 Jun 16;792:148444. Epub 2021 Jun 16.

College of Information Science & Technology, Beijing University of Chemical Technology, Beijing, China; Engineering Research Center of Intelligent PSE, Ministry of Education in China, Beijing, China. Electronic address:

The combustion of fossil fuels produces a large amount of carbon dioxide (CO), which leads to global warming in the world. How to rationally consume fossil energy and control CO emissions has become an unavoidable problem for human beings while vigorously developing economy. This paper proposes a novel economy and CO emissions prediction model using an improved Attention mechanism based long short term memory (LSTM) neural network (Attention-LSTM) to analyze and optimize the energy consumption structures in different countries or areas. Read More

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Thermal Properties and Key Groups Evolution of Low-Temperature Oxidation for Bituminous Coal under Lean-Oxygen Environment.

ACS Omega 2021 Jun 2;6(23):15115-15125. Epub 2021 Jun 2.

School of Safety Science and Engineering, Henan Polytechnic University (HPU), 2001, Century Avenue, Jiaozuo, Henan 454000, China.

To deeply explore the spontaneous combustion disaster of coal caused by air leakage and oxygen supply, low-temperature coal oxidation experiments under different oxygen concentrations (DOC) were carried out. Within the coal spontaneous combustion characteristic measurement system, a synchronous thermal analyzer (STA) and a Fourier transform infrared spectrometer (FTIR), the macro laws of gas and heat generation under DOC are analyzed, and the mechanism of the development of coal spontaneous combustion restricted by the lean-oxygen environment is also revealed. The results show that the change of oxygen concentration (OC) does not affect the critical temperature value and gas index change trend, but the lean-oxygen environment reduces the gas concentration and heat production rate very obviously. Read More

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The impact of organic extracts of seasonal PM on primary human lung epithelial cells and their chemical characterization.

Environ Sci Pollut Res Int 2021 Jun 20. Epub 2021 Jun 20.

Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital, 101 Daehakno, Jongno-gu, Seoul, 03080, Korea.

Lung epithelial cells serve as the first line of defense against various inhaled pollutant particles. To investigate the adverse health effects of organic components of fine particulate matter (PM) collected in Seoul, South Korea, we selected 12 PM samples from May 2016 to January 2017 and evaluated the effects of organic compounds of PM on inflammation, cellular aging, and macroautophagy in human lung epithelial cells isolated directly from healthy donors. Organic extracts of PM specifically induced neutrophilic chemokine and interleukin-8 expression via extracellular signal-regulated kinase activation. Read More

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Constructing Co-N-C Catalyst via a Double Crosslinking Hydrogel Strategy for Enhanced Oxygen Reduction Catalysis in Fuel Cells.

Small 2021 Jun 17:e2100735. Epub 2021 Jun 17.

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.

Exploiting platinum-group-metal (PGM)-free electrocatalysts with remarkable activity and stability toward oxygen reduction reaction (ORR) is of significant importance to the large-scale commercialization of proton exchange membrane fuel cells (PEMFCs). Here, a high-performance and anti-Fenton reaction cobalt-nitrogen-carbon (Co-N-C) catalyst is reported via employing double crosslinking (DC) hydrogel strategy, which consists of the chemical crosslinking between acrylic acid (AA) and acrylamide (AM) copolymerization and metal coordinated crosslinking between Co and P(AA-AM) copolymer. The resultant DC hydrogel can benefit the Co dispersion via chelated Co-N/O bonds and relieve metal agglomeration during the subsequent pyrolysis, resulting in the atomically dispersed Co-Nx/C active sites. Read More

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Prediction of spontaneous coal combustion tendency using the Multinomial Logistic Regression.

Int J Occup Saf Ergon 2021 Jun 18:1-23. Epub 2021 Jun 18.

Department of Maritime Business Administration, Bandirma Onyedi Eylul University, Bandirma, Turkey.

Spontaneous combustion of coal is a complex underground mining disaster, which mainly threats mine safety and efficiency. Several factors usually cause spontaneous combustion of coal such as gas concentration, ventilation, coal properties. In this study, spontaneous combustion tendencies of the coal mines were predicted considering the effective parameters for an underground coal mine in Turkey. Read More

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Genotoxicity and cytotoxicity evaluation of two thallium compounds using the wing somatic mutation and recombination test.

Heliyon 2021 May 27;7(5):e07087. Epub 2021 May 27.

Unidad de Investigación en Genética y Toxicología Ambiental, Unidad Multidisciplinaria de Investigación Experimental (UMIE-Z), FES Zaragoza, Campus II, UNAM, Iztapalapa, C.P. 15000, CdMx, Mexico.

Thallium (Tl) is a heavy and toxic metal and a byproduct of several human activities, such as cement production, mining, and coal combustion. Thallium is found in fruits, vegetables, and animal fodder with high Tl contamination; therefore, it is an environmental pollution issue and a toxicological contamination problem for human beings and other organisms when exposed to it. The mutagenic potential of Tl and its compounds is controversial, and there are few studies on its effects. Read More

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Seasonal and areal variability in PM poses differential degranulation and pro-inflammatory effects on RBL-2H3 cells.

Chemosphere 2021 Sep 17;279:130919. Epub 2021 May 17.

Center for Health and the Environment, University of California, Davis, USA.

PM pollution is a widespread environmental and health problem, particularly in China. Besides leading to well-known diseases in the respiratory system, PM can also alter immune function to induce or aggravate allergic diseases. To determine whether there are temporal and spatial differences in the allergic responses to PM, monthly samples were collected from four regions (urban, industrial, suburban, and rural areas) through a whole year in Nanjing city, China. Read More

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September 2021

Characterization and risk assessment of polycyclic aromatic hydrocarbon emissions by coal fire in northern China.

Environ Geochem Health 2021 Jun 14. Epub 2021 Jun 14.

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083, China.

Coal spontaneous combustion is known to emit a variety of organic carcinogenic pollutants, polycyclic aromatic hydrocarbons (PAHs) are the most prominent. The Wuda coalfield is a coal fire-prone region in northern China. Coal fire sponges (CFS), a sponge-like contaminated soil protrusion, occur widely in the Suhaitu mining area. Read More

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Source sector and fuel contributions to ambient PM and attributable mortality across multiple spatial scales.

Nat Commun 2021 06 14;12(1):3594. Epub 2021 Jun 14.

Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA.

Ambient fine particulate matter (PM) is the world's leading environmental health risk factor. Reducing the PM disease burden requires specific strategies that target dominant sources across multiple spatial scales. We provide a contemporary and comprehensive evaluation of sector- and fuel-specific contributions to this disease burden across 21 regions, 204 countries, and 200 sub-national areas by integrating 24 global atmospheric chemistry-transport model sensitivity simulations, high-resolution satellite-derived PM exposure estimates, and disease-specific concentration response relationships. Read More

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Organic compound source profiles of PM from traffic emissions, coal combustion, industrial processes and dust.

Chemosphere 2021 Sep 31;278:130429. Epub 2021 Mar 31.

School of Geography Earth and Environmental Science, University of Birmingham, Birmingham, B15 2TT, UK. Electronic address:

Eighteen polycyclic aromatic hydrocarbons (PAHs), 24 n-alkanes, 7 hopanes, 2 cholestanes, inorganic ions, elements and carbon fractions were analyzed in real-world source samples of PM (fine particulate matter) from traffic emissions (gasoline vehicles-TGV, diesel vehicles-TDV, diesel ship-TDS, and heavy oil ships-THOS), coal combustion (coal-fired industrial boilers-CIB, power plants-CPP, and residential stoves-CRS), industrial process emissions (cement industry-IPCI, and steel industry-IPSI), and dust (soil dust-DSD, road dust-DRD, and construction dust-DCD). High molecular weight (sum of five to seven rings) PAHs accounted for higher fractions for TGV (80%) and THS (61%) than for TDV, TDS and coal combustion sources (31%-47%). Hopane ratios (C29αβ/C30αβ) in coal related sources were mostly higher than 1, whereas that of traffic emissions was lower than 1. Read More

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September 2021

Combustion wastes from thermal power stations and household stoves: A comparison of properties, mineralogical and chemical composition, and element mobilization by water and fertilizers.

Waste Manag 2021 Jun 14;131:136-146. Epub 2021 Jun 14.

Warsaw University of Life Sciences-SGGW, Institute of Agriculture, Department of Soil Science, Nowoursynowska St. 159 Building no 37, 02-776 Warszawa, Poland.

Wood and coal combustion generate wastes, which may negatively influence the environment. However, studies concerning coal combustion products serving as soil additives are currently in progress. Hence, this study was conducted to compare properties (mineralogy, metallic element content, and rare earth element content) of combustion wastes of different genesis (ash and soot after wood and coal combustion in households, ash from thermal power stations) and to assess possible risk posed to the soil environment when used as soil additive. Read More

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Co-hydrothermal carbonization of swine manure and cellulose: Influence of mutual interaction of intermediates on properties of the products.

Sci Total Environ 2021 May 29;791:148134. Epub 2021 May 29.

School of Material Science and Engineering, University of Jinan, Jinan 250022, China. Electronic address:

Co-hydrothermal carbonization (HTC) of livestock manure and biomass might improve the fuel properties of the hydrochar due to the high reactivity of the biomass-derived intermediates with the abundant oxygen-containing functionalities. However, the complicated compositions make it difficult to explicit the specific roles of the individual components of biomass played in the co-HTC process. In this study, cellulose was used for co-HTC with swine manure to investigate the influence on the properties of the hydrochar. Read More

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Characteristics of migration and speciation of trace elements during co-processing of antibiotic residues in a circulating fluidized bed.

Environ Sci Pollut Res Int 2021 Jun 12. Epub 2021 Jun 12.

School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China.

In order to study the emission characteristics of the products during the blending of antibiotic residues in coal-fired power plants, blending tests were performed on a 140 t/h circulating fluidized bed boiler. It was found that during combustion, 64 to 87.6% of Cr, As, and Pb are concentrated in the fly ash, and 11. Read More

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Accumulation risk and source apportionment of heavy metals in different types of farmland in a typical farming area of northern China.

Environ Geochem Health 2021 Jun 11. Epub 2021 Jun 11.

Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing, 100012, China.

The types of land used for farmland can greatly influence the source and accumulation risk of heavy metals in soil. However, the apportioning quantitatively the source of soil heavy metals has been studied insufficiently, especially in terms of different types of farmland. In this study, a total of 252 soil samples were taken from dry land, paddy fields and greenhouse fields in the Jinyuan district of Taiyuan city, China, to assess the accumulation risk of heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb and Zn). Read More

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Combustion-derived particulate organic matter associated with hemodynamic abnormality and metabolic dysfunction in healthy adults.

J Hazard Mater 2021 May 29;418:126261. Epub 2021 May 29.

Department of Occupational and Environmental Health Sciences, Peking University School of Public Health, and Peking University Institute of Environmental Medicine, Beijing, China; Key Laboratory of Molecular Cardiovascular Sciences of Ministry of Education, Health Science Center, Peking University, Beijing, China. Electronic address:

Epidemiological evidence on cardiometabolic health of particulate organic matter (POM) and its sources is sparse. In a panel of 73 healthy adults in Beijing, China, daily concentrations of ambient fine particulate matter-bound polycyclic aromatic hydrocarbons (PAHs) and n-alkanes were measured throughout the study period, and Positive Matrix Factorization approach was used to identity PAHs sources. Linear mixed-effect models and mediation analyses were applied to examine the associations and potential interlink pathways between POM and biomarkers indicative of hemodynamics, insulin resistance, vascular calcification and immune inflammation. Read More

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Chemical source profiles of particulate matter and gases emitted from solid fuels for residential cooking and heating scenarios in Qinghai-Tibetan Plateau.

Environ Pollut 2021 Jun 2;285:117503. Epub 2021 Jun 2.

The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710049, China.

Incomplete combustion of solid fuels (animal dung and bituminous coal) is a common phenomenon during residential cooking and heating in the Qinghai-Tibetan Plateau (QTP), resulting in large amounts of pollutants emitted into the atmosphere. This study investigated the pollutant emissions from six burning scenarios (heating and cooking with each of the three different fuels: yak dung, sheep dung, and bitumite) in the QTP's pastoral dwellings. Target pollutants such as carbon monoxide (CO), gas-phase polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), fine particles (PM, particulate matter with an aerodynamic diameter < 2. Read More

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Significant contributions of combustion-related NH and non-fossil fuel NO to elevation of nitrogen deposition in southwestern China over past five decades.

Glob Chang Biol 2021 Jun 5. Epub 2021 Jun 5.

School of Earth System Science, Tianjin University, Tianjin, China.

Anthropogenic nitrogen (N) emissions and deposition have been increasing over past decades. However, spatiotemporal variations of N deposition levels and major sources remain unclear in many regions, which hinders making strategies of emission mitigation and evaluating effects of elevated N deposition. By investigating moss N contents and δ N values in southwestern (SW) China in 1954-1964, 1970-1994, and 2005-2015, we reconstructed fluxes and source contributions of atmospheric ammonium ( ) and nitrate ( ) deposition and evaluated their historical changes. Read More

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Effect of the reignition characteristics on long-flame coal by oxidization and water immersion.

Environ Sci Pollut Res Int 2021 Jun 5. Epub 2021 Jun 5.

School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.

After a coal seam is mined, the coal remaining in the goaf is prone to flooding and spontaneous combustion accidents. To explore the reignition (secondary oxidation) characteristics of long-flame coal after oxidation and water immersion, the experimental methods of thermogravimetric analysis and infrared spectroscopy were used to analyze coal samples of oxidation first and then water immersion (FO) and samples of water immersion first and then oxidization (FI) at different pre-oxidation temperatures. The results showed that the content of main oxygen-containing functional groups (hydroxyl, carbonyl, and carboxyl groups) of the FO120 (oxidation 120 °C first and then water immersion) coal sample increased, and the FI 90 (water immersion first and then oxidization 90 °C) coal sample decreased. Read More

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Developing an integrated framework for source apportionment and source-specific health risk assessment of PAHs in soils: Application to a typical cold region in China.

J Hazard Mater 2021 08 24;415:125730. Epub 2021 Mar 24.

College of Water Sciences, Beijing Normal University, Beijing 100875, China; Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, China. Electronic address:

Here, a new integrated methodology framework has been proposed for source apportionment and source-oriented risk evaluation, and applied to identify the characteristics, sources and health risks of PAHs in the soils of a typical cold region in Northeastern China. To this end, a large-scale data set containing 1780 soil samples and 16 priority PAHs has been collected from the study area. Two advanced receptor models, positive matrix factorization (PMF) and multivariate curve resolution-weighted alternating least-squares (MCR-WALS), have been comparatively employed to apportion the pollution sources of soil PAHs, with the help of a set of modified literature PAH source fingerprints. Read More

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A comparison investigation of atmospheric NMHCs at two sampling sites of Beijing city and a rural area during summertime.

Sci Total Environ 2021 Aug 10;783:146867. Epub 2021 Apr 10.

Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100085, China.

Atmospheric non-methane hydrocarbons (NMHCs) were measured synchronously at an urban site of Beijing city (BJ) and a rural site of Dongbaituo (DBT) in Hebei province from 1 July to 15 August 2016. The average concentration of the total NMHCs (TNMHCs) at DBT site were about a factor of 1.3 higher than that at BJ site. Read More

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Assessment of heavy metal contamination in soils at the Kpone landfill site, Ghana: Implication for ecological and health risk assessment.

Chemosphere 2021 May 28;282:131007. Epub 2021 May 28.

CSIR-Water Research Institute, P. O. Box M 32, Accra, Ghana.

Concentrations of lead (Pb), zinc (Zn), copper (Cu), mercury (Hg), and arsenic (As) in soils at the Kpone landfill site (Ghana) were determined using Atomic Absorption Spectrophotometry (AAS). Further analyses allowed establishing the degree of heavy metals (HMs) pollution, suitability of the soils for agriculture, sources of the HMs and their ecological and health risks. The site was divided into five zones, A, B, C, D, and E, and in all, seventeen (17) soil samples were collected. Read More

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Evaluation on nitrogen conversion during biomass torrefaction and its blend co-combustion with coal.

Bioresour Technol 2021 May 20;336:125309. Epub 2021 May 20.

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, PR China.

In this work, biomass torrefaction was combined with coal co-combustion to illustrate the differences in biomass performance and the mechanisms of migration and transformation of nitrogen over the entire course of thermal treatments. XPS analysis illustrated that torrefaction in CO suppressed the conversion of pyrrole-N (N-5) to quaternary-N (N-Q), whereas the trend for an O atmosphere moved in the opposite direction. During co-combustion, the impact on NO emission reduction shifted from positive to negative as the pretreatment temperature was raised, which is closely related to the six elementary reactions involving the intermediacy of NCO and NH, as well as to heterogeneous reduction of NO with char. Read More

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Development and Characterization of Polypropylene Waste from Personal Protective Equipment (PPE)-Derived Char-Filled Sugar Palm Starch Biocomposite Briquettes.

Polymers (Basel) 2021 May 24;13(11). Epub 2021 May 24.

Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, UPM Serdang 43400, Selangor, Malaysia.

Slow pyrolysis using a batch reactor at 450 °C was applied to the polypropylene (PP) powder derived from Coronavirus Disease 2019 (COVID-19) isolation gown waste to yield char briquettes, using sugar palm starch (SPS) and a manual hydraulic press. These studies are significant because of reductions in plastic waste from the preparation of barbecue coal due to environmental sustainability. The results presented here include the physical, morphological, thermal, combustion, and mechanical properties of char when reinforced with various percentages of SPS loadings (0, 10, 20, 30, and 40%), which act as a matrix/binder to produce char/sugar palm starch (C/SPS) composites. Read More

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The Influence of External Environmental Conditions on Properties of Ceramic Building Materials with Waste Material Additives.

Materials (Basel) 2021 May 31;14(11). Epub 2021 May 31.

Faculty of Civil Engineering, Wroclaw University of Science and Technology, 50-377 Wroclaw, Poland.

In this paper, we analyze the state of conservation of ceramic building materials (clay masonry units) containing a large share of waste materials in the form of ash and slag from coal combustion and sawdust from wood processing, operated for several decades in facing walls of religious buildings, in external environment conditions. For the purpose of this analysis, comparative tests were carried out on the samples of ceramic materials cut out from facing walls and samples extracted from the same ceramic materials; they were stored in laboratory conditions for the entire time. The following were investigated: initial water absorption, capillary rise, and porosity structure determined with mercury intrusion porosimetry (MIP). Read More

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Simultaneous Removal of Pb and Zn Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite.

Materials (Basel) 2021 May 25;14(11). Epub 2021 May 25.

Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland.

Pure zeolite (Na-X) and a zeolite-carbon composite (Na-X(C)) were investigated as adsorbents of heavy metals-Pb and Zn from an aqueous solution. These materials were synthesized from fly ash-a waste from conventional hard coal combustion. Both solids were characterized using XRD, SEM-EDS, nitrogen adsorption/desorption, particle size and elemental composition analyses. Read More

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