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Long-term performance: strength and metal encapsulation in alkali-activated iron ore tailings

environmental Science and Pollution Research 2024年第34期31卷 47071-47083页

作者： Levandoski, William Mateus Kubiaki Ferrazzo, Suéllen Tonatto Piovesan, Maria Alice Bruschi, Giovani Jordi Consoli, Nilo Cesar Korf, Eduardo Pavan Graduate Program in Environmental Science and Technology Universidade Federal da Fronteira Sul RS Erechim99700-970 Brazil Graduate Program in Civil Engineering Universidade Federal Do Rio Grande Do Sul RS Porto Alegre90035-190 Brazil Undergraduate Program in Environmental and Sanitary Engineering Universidade Federal da Fronteira Sul RS Erechim99700-970 Brazil

Understanding the strength behavior and leaching characteristics of mining tailings stabilized with alkali-activated cements in the short, medium, and long term is crucial for the feasibility of material applications. In this context, this study assessed the stabilization/solidification of iron ore tailings (IOT) using alkali-activated binder (AAB) composed of sugarcane bagasse ash and eggshell lime at curing times of 7, 28, 60, 90, 180, and 365 days. Additionally, leaching tests were conducted, along with the examination of possible changes in the chemical and mineralogical composition resulting from exposure to acidic environments. Tests included unconfined compression strength (UCS), leaching, X-ray diffraction, and Fourier-transform infrared spectroscopy for the IOT-AAB mixtures. The highest increase in UCS was observed between 7 and 60 days, reaching 6.47 MPa, with minimal variation thereafter. The AAB-bonded IOT exhibited no metal toxicity over time. Elements Ba, Mn, Pb, and Zn present in IOT and ash were encapsulated in the cemented matrix, with complete encapsulation of all metals observed from 90 days of curing time. The mineralogy of the stabilized/solidified tailings showed no changes resulting from leaching tests. Characteristic bands associated with the presence of N-A-S–H gel were identified in both pre-leaching and post-leaching samples for all curing times analyzed. Exposure to acidic environments altered bands related to carbonate bonds formed in the IOT-AAB mixture. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Lime

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Effectiveness of Predicting Event-Level Interception Losses Across Diverse Vegetated Sites Using Statistical Models

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Ecohydrology 2025年第3期18卷

作者： Abigail G. Sandquist Stephen P. Good Gabriel Barinas Scott T. Allen Graduate Program of Hydrologic Sciences University of Nevada Reno Reno Nevada USA Department of Natural Resources and Environmental Science University of Nevada Reno Reno Nevada USA Water Resources Graduate Program Oregon State University Corvallis Oregon USA Biological & Ecological Engineering Department Oregon State University Corvallis Oregon USA

Understanding evaporation from wet canopies across ecosystems is challenged by its spatiotemporal variability and associated observational challenges. Precipitation and throughfall were measured at 22 sites of the National Ecological Observatory Network using consistent methodologies across diverse climates and ecosystems, providing a novel opportunity to examine the performance of statistical models in predicting interception loss from meteorological and canopy-structure data. We used those data to quantify event-level interception losses and found wide variation; median interception loss of small storms (< 10 mm) was 37.7% (39% inter-quartile range), and of large storms (> 50 mm) was 19.8% (20% interquartile range). We found storm gross-precipitation depth was the most important variable for predicting the amount of interception loss (predicting ~70% of the variation), followed by mean canopy height and air temperature. Storm gross-precipitation depth was also an important predictor of interception loss as a percent of storm depth, but much less variation was explained ( R 2 = 0.11, RMSE = 24%). Prediction of percent interception loss improved ( R 2 = 0.32 and RMSE = 19%) by including additional meteorological and vegetation structure characteristics in a random forest model. In addition to demonstrating the greater importance of storm traits over vegetation traits in predicting event interception losses, this analysis showed that relationships between storm traits and interception losses differed among sites; these inconsistent relationships across sites limited the ability for any statistical model to perform well in predicting event-level interception losses across sites, which may justify the use of alternative approaches (e.g. process-based models).

关键词： rainfall partitioning remote sensing throughfall vegetation structure

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5-Methyluridine is Ubiquitous in Pseudomonas aeruginosa tRNA and Modulates Antimicrobial Resistance and Virulence

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Journal of Molecular Biology 2025年 169020页

作者： Chittrakanwong, Jurairat Chen, Ruixi Wu, Junzhou Demott, Michael S. Sun, Jingjing Phatinuwat, Kamonwan Jaroensuk, Juthamas Atichartpongkul, Sopapan Mongkolsuk, Skorn Begley, Thomas Dedon, Peter C. Fuangthong, Mayuree Program in Applied Biological Sciences Chulabhorn Graduate Institute Bangkok Thailand Department of Biological Engineering Massachusetts Institute of Technology Cambridge MA United States Antimicrobial Resistance Interdisciplinary Research Group Singapore-MIT Alliance for Research and Technology Singapore Singapore Center for Environmental Health Sciences Massachusetts Institute of Technology Cambridge MA United States Laboratory of Biotechnology Chulabhorn Research Institute Bangkok Thailand Center of Excellence on Environmental Health and Toxicology (EHT) Bangkok Thailand The RNA Institute and Department of Biological Sciences University at Albany Albany NY United States

Building on decades of work in characterizing the dozens of RNA modifications in the microbial epitranscriptome, recent advances in analytical technology and genetics have revealed systems-level functions for many tRNA modifications. The tRNA (uracil-5-)-methyltransferase TrmA and its product, 5-methyl uridine (m⁵U) at position 54 in the T-loop, however, has not been linked to a specific phenotype. Here, we defined the functional and biological roles of TrmA in Pseudomonas aeruginosa (PA14), a major multidrug-resistant pathogen. Surprisingly, though TrmA was found to site-specifically catalyze m⁵U54 on all PA14 tRNAs, loss of TrmA had no effect on the levels of any of 36 tRNA modifications except m⁵U and had minimal effects on multiple phenotypic parameters, including growth rate, morphology, motility, and biofilm formation. However, loss of TrmA conferred a striking polymyxin antibiotic resistance. mRNA and tRNA profiling and proteomics analyses revealed that TrmA regulates the expression of codon-biased gene families at the level of translation, including components of a type III secretion system (T3SS). Loss of TrmA upregulated T3SS, leading to increased macrophage IL-1β in bacterial challenge tests. Altogether, these results revealed novel biological functions of TrmA and its roles in modulating gene expression at multiple levels in P. aeruginosa. © 2025 Elsevier Ltd

关键词： codon usage Pseudomonas aeruginosa translation TrmA tRNA modification

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Modeling the adsorption of ciprofloxacin on magnetic biochar: A comparative study of traditional and advanced approaches

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Journal of Water Process engineering 2025年 74卷

作者： Fuhr, Ana Carolina Ferreira Piazzi Rodrigues, Daniel Lucas Costa Guido, Júlia Amaral de Azevedo, Cristiane Ferraz de Souza, Nicholas Fernandes Dotto, Guilherme Luiz Lima, Eder Claudio Machado Machado, Fernando Technology Development Center Federal University of Pelotas (UFPel) 1 Gomes Carneiro St RS Pelotas 96010-610 Brazil Materials Science and Engineering Graduate Program Federal University of Pelotas (UFPel) 1 Gomes Carneiro St. RS Pelotas 96010-610 Brazil Center of Engineering Federal University of Pelotas 989 Benjamin Constant St. RS Pelotas 96010-020 Brazil Environmental Science Graduate Program Federal University of Pelotas (UFPel) 989 Benjamin Constant St. RS Pelotas 96010-020 Brazil Chemical Engineering Department Federal University of Santa Maria (UFSM) 1000 Roraima Av. RS Santa Maria 97105-900 Brazil Institute of Chemistry Federal University of Rio Grande do Sul (UFRGS) 9500 Bento Gonçalves Av. Postal Box 15003 RS Porto Alegre 91501-970 Brazil

This study prepared magnetic-activated biochar (MAB) through microwave pyrolysis and chemical activation of olive agro-industrial biomass. The adsorbent was characterized by SEM-EDS, FTIR, XRD, N₂ adsorption/desorption, VSM, IEP, and pH point of zero charge techniques, indicating different structural properties. The adsorption capacity for ciprofloxacin (CIP) removal was evaluated through batch tests, assessing kinetics and equilibrium. The adsorption kinetics followed the general order model. The process was fast, with MAB achieving a half-adsorption time of up to 3 min. In contrast, the Liu model showed a maximum capacity of 215 mg g⁻¹ at 328 K. Statistical models indicated multilayer adsorption, with layer numbers varying from 3.4 to 2.1. The temperature significantly affects steric parameters, increasing the number of CIP molecules adsorbed per site while reducing the number of layers formed. Thermodynamic analysis suggested physical interactions, including hydrogen bonding and π-π interactions, as the primary removal mechanisms. A simulated effluent test demonstrated a 98.98 % removal efficiency, confirming MAB's effectiveness in removing emerging pollutants like CIP and its potential for wastewater treatment applications. MAB can be easily recovered from aqueous media using magnetic fields. Additionally, its adsorption capacity can be regenerated using green solvent elution. These characteristics highlight its potential for wastewater treatment of contaminants of emerging concern. © 2025 Elsevier Ltd

关键词： Adsorption Biomass Contaminants of emerging concern Physical interactions Statistical physics

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Prospecting toxicity of the avobenzone sunscreen in plants

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environmental Science and Pollution Research 2024年第31期31卷 44308-44317页

作者： Beijora, Sara Splendor Vaz, Thalia Aparecida Correia Santo, Diego Espirito de Almeida, Edson Araújo Junior, Osvaldo Valarini Parolin, Mauro da Silva Gonzalez, Regiane de Souza, Débora Cristina Peron, Ana Paula Chemical Engineering Course Federal Technological University of Paraná Campo Mourão Paraná Brazil Graduate Program in Environmental Engineering Federal Technological University of Paraná Paraná Francisco Beltrão Brazil Graduate Program in Chemistry State University of Maringá Paraná Maringá Brazil Academic Department of Food and Chemical Engineering Federal Technological University of Paraná Paraná Campo Mourão Brazil Graduate Program in Geography State University of Maringá Paraná Maringá Brazil Graduate Program in Food Technology Federal Technological University of Paraná Paraná Campo Mourão Brazil Graduate Program in Water Resources and Environmental Engineering Federal University of Paraná Paraná Brazil Graduate Program in Technological Innovations Federal Technological University of Paraná Via Rosalina Maria Dos Santos 1233 Paraná Campo Mourão87.301-899 Brazil

Avobenzone (AVO) is a sunscreen with high global production and is constantly released into the environment. Incorporating sewage biosolids for fertilization purposes, the leaching from cultivated soils, and the use of wastewater for irrigation explain its presence in the soil. There is a lack of information about the impact of this sunscreen on plants. In the present study, the ecotoxicity of AVO was tested at concentrations 1, 10, 100, and 1,000 ng/L. All concentrations caused a reduction in root growth of Allium cepa, Cucumis sativus, and Lycopersicum esculentum seeds, as well as a mitodepressive effect, changes in the mitotic spindle and a reduction in root growth of A. cepa bulbs. The cell cycle was disturbed because AVO disarmed the enzymatic defense system of root meristems, leading to an accumulation of hydroxyl radicals and superoxides, besides lipid peroxidation in cells. Therefore, AVO shows a high potential to cause damage to plants and can negatively affect agricultural production and the growth of non-cultivated plants. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Cell proliferation

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TIDES IN THE ENGLISH-CHANNEL AND SOUTHERN NORTH-SEA - A FREQUENCY-DOMAIN ANALYSIS USING MODEL TEA-NL

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ADVANCES IN WATER RESOURCES 1989年第4期12卷 166-183页

作者： BAPTISTA, AM WESTERINK, JJ TURNER, PJ Department of Environmental Science and Engineering Oregon Graduate Center 19600 NW Von Neumann Drive Beaverton OR 97006 USA Ocean Engineering Program Civil Engineering Department Texas A & M University College Station TX 77843 USA

The frequency-time finite element model TEA-NL is used to investigate tidal propagation and circulation in the English Channel and the southern North Sea, in the context of the Tidal Flow Forum benchmark. Quality of TEA-NL simulations, relative to both field data and simulations by other numerical models is discussed. Sensitivity analyses are performed with regard to the effect on accuracy of bottom friction, and the effect on computational cost of the strategy used to harmonically decompose and iterate non-linear loading terms in the shallow water equations.

关键词： Tides

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Frost Damage Resistance of Portland Blast-Furnace Slag Cement Concrete Cured Internally by Using Roof-Tile Waste Aggregate 2nd

Frost Damage Resistance of Portland Blast-Furnace Slag Cemen...

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2nd International Conference on Sustainable Civil engineering and Architecture, ICSCEA 2021

作者： Kirimoto, Taishi Ogawa, Yuko Kawai, Kenji Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Higashihiroshima City Japan

ISBN: (纸本)9789811933028

The purpose of this study was to clarify the relationship between the internal curing effect of roof-tile waste aggregate and frost damage resistance, and to investigate the effects of the replacement ratio of roof-tile waste aggregate as well as curing conditions on the frost damage resistance of concrete. Five types of concrete using Portland blast-furnace slag cement were prepared with a water-to-cement ratio of 0.50 and different replacement ratios of roof-tile waste coarse aggregate (20% and 50% by volume) and roof-tile waste fine aggregate (23% and 58% by volume). Concrete specimens were cured at 20 °C under sealed condition for 3, 7, or 28 days, and they were subsequently exposed to air at 20 °C and 60%R.H. until the age of 28 days. Then, the tests for resistance of concrete to freezing and thawing were carried out for 300 cycles in water, and the relative dynamic modulus of elasticity as well as the mass loss was assessed at the designated periods. As a result, it was found that sufficient frost damage resistance could be secured when the replacement ratio of roof-tile waste aggregate was approximately 20% by volume, and the improvement in frost damage resistance was observed especially when fine aggregate was replaced. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Slags

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Multi-layered shear model test to simulate rain-induced pre-failure shear deformation in surface layer of slopes 16

Multi-layered shear model test to simulate rain-induced pre-...

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16th Asian Regional Conference on Soil Mechanics and Geotechnical engineering, ARC 2019

作者： Fukuhara, Makoto Tao, S. Uchimura, T. International Graduate Program on Civil and Environmental Engineering Saitama University Saitama Japan Department of Civil and Environmental Engineering Saitama University Saitama Japan

The time-dependent developments of the strain observed on the slope surface in pre-failure stages are often expressed in analogy with the development of strain at creep fracture of metals. Therefore, several equations for prediction of slope failure using the creep models have been proposed and used. In this study, multi-layered shear model test apparatus was developed to observe detailed movement of the surface layer of slope before failure. And, the conventional methods to predict the failure time were validated based on the test results. Copyright © Soil Mechanics and Geotechnical engineering, ARC *** rights reserved.

关键词： Failure (mechanical)

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Multi-Criteria Spatial Analysis of Hazardous Materials Transportation 2

Multi-Criteria Spatial Analysis of Hazardous Materials Trans...

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2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014

作者： Cordeiro, Francyelly Giovany Bezerra, Barbara Stolte Peixoto, Anna Silvia P. Kaiser, Ilza Machado UNESP - Univ. Estadual Paulista Graduate Studies Program in Civil and Environmental Engineering Brazil

ISBN: (纸本)9780784413609

The development of the world economy increases trade, thereby inducing a large amount of goods transportation. In many developing countries, such as Brazil, the transportation system is predominated by the highway mode. Municipal highways, most of time, are part of the main road cargo transportation system, and this makes the traffic of hazardous materials a risk to society and the environment. The goal of the paper is the use of a multi-criteria analysis methodology, for modeling of the environmental risk of Road Transport of Hazardous Materials (RTHM) in Sao Paulo State - Brazil. Therefore, a methodological discussion is presented to explore the issues inherent to the composition of the panel of experts to assign weights to each criterion and to quantify the relative importance of each for risk analysis of environmental damage. © 2014 American Society of Civil Engineers.

关键词： Risk analysis

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Reversible adsorption of metalworking fluids (MWFs) on Cu-BTC metal organic framework

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Chinese Journal of Chemical engineering 2017年第6期25卷 768-774页

作者： Kwannapat Sorachoti Bhuckchanya Pangkumhang Visanu Tanboonchuy Sarttrawut Tulaphol Nurak Grisdanurak International Program in Hazardous Substance and Environmental Management Graduate School Chulalongkom University Bangkok Thailand Center of Excellence on Hazardous Substance Management ( HSM) Chulalongkorn University. Bangkok Thailand Department of Environmental Engineering Faculty of Engineering Khon Kaen University Khon Kaen Thailand Department of Chemical Engineering Faculty of Engineering Thammasat University Pathumthani Thailand Center of Excellence in Environmental Catalysis and Adsorption Thammasat Unive-rsity Pathumthani Thailand

Metalworking fluids(MWFs) are classified as hazardous substances. Due to the characteristics of the stable oil–water emulsions, it requires more costly and complicate treatment techniques to remove oil from spent MWFs. Metal organic frameworks(MOFs) are a porous network material used to remove contaminants from environment. One of the most prominent of MOFs is HKUST-1 or Cu-BTC. In this study, the Cu-BTCs were prepared by solvothermal method in various conditions and used as absorbent for removing oil micelles in MWF emulsion. The particle size of all synthesized Cu-BTCs ranged from ≈80 to 400 nm. The ability of all synthesized Cu-BTCs to remove oil micelle was greater than 95% in 60 min, while the capacity of GAC was obtained the result for only 6.8%. The maximum adsorption capacity(q _(max)) of oil micelles on Cu-BTCs was 1666.7 mg·g^(-1). The highest removal capacity of oil micelles in MWF emulsion is greater than 99% in 24 h by using Cu-BTCs washed with either butanol or ethanol.

关键词： Metalworking fluids Cutting fluids Metal organic frameworks

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