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Theoretical and Experimental Studies on Characterisation and Collection of Particulate Matter in Single-Wire, Single-Stage Electrostatic Precipitator with Square Cross-Section

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SSRN 2024年

作者： Kumar, Aiswarya A. Nawale, Prashant Rohidas Mayya, Y.S. Sahu, Manoranjan Aerosol and Nanoparticle Technology Laboratory Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai400076 India Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400076 India Centre for Machine Intelligence and Data Science Indian Institute of Technology Bombay Mumbai400076 India Chemical Engineering Department Indian Institute of Technology Bombay Mumbai400076 India

Electrostatic precipitation (ESP) is a technology widely used to remove particulate matter (PM) from industrial gas streams. To adopt the same for varying scales as well as for different clean air delivery applications as in indoor and outdoor air pollution, there exists a requirement for the development of comprehensive, readily adaptable, reasonably good, comparable, rigorous, step-by-step analytical theory and experimental validation of same for design of modular units of ESP. In this regard, the current study conducted theoretical and experimental studies to investigate corona characterisation and PM collection efficiency in a modular unit of a single-wire, single-stage, wire-plate ESP with square cross-sectional geometry. The theoretical study integrated the corona discharge model with particle transport model while the experimental study was conducted using a laboratory scale ESP operated at different flow rates and various potentials. Results obtained from both theory and experimental studies for current-voltage (I-V) characteristics were consistent with the well-known quadratic behaviour beyond the critical potential. The best agreement between the I-V characteristics of theory and the experiment was obtained while adjusting the inception electric field ( to 12.35´105 Vm-1 as well as the ion diffusion coefficient value to 0.0647´10-4 m2s-1. Tuned theory predicted PM collection efficiency at three different flow rates of 30, 50 as well as 100 LPM and at various potentials 9 kV, 11 kV as well as 13 kV respectively. Comparing the predicted results from theory and experiment, it is understood that agreement between theory and experiment is acceptable in the case of varied flow rates and is good for potentials for varied size ranges from 13 nm to 800 nm. Relative error for local minimum efficiency between theory as well as experiment for three tested flow rates were 5.37%, 1.36%, 14.58% and was 1.36%, 7.52% and 6.23% for three potentials respectively. As accuracy

关键词： Electrostatic precipitators

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Linkages of the 2022 Unprecedented Global Heatwave Events to Triple-Dip La Niña

Linkages of the 2022 Unprecedented Global Heatwave Events to...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Sachi Perera Joshua B. Fisher Mohamed Allali Hesham El-Askary Computational and Data Sciences Graduate Program Schmid College of Science and Technology Chapman University Orange CA USA Earth Systems Science and Data Solution Lab Chapman University Orange CA USA Schmid College of Science and Technology Chapman University Orange CA USA Fowler School of Engineering Chapman University Orange CA USA Department of Environmental Sciences Faculty of Science Alexandria University Alexandria Egypt

ISBN: (数字)9798350360325

ISBN: (纸本)9798350360332

Heatwaves are influenced significantly by El Niño-Southern Oscillation (ENSO), which alters temperature and precipitation patterns throughout the world. Since 2020, we have witnessed a "triple dip" La Niña conditions persisting for three consecutive years resulting in severe weather and climate driven events globally. In this study, we identified the dominant frequency of Niño 3.4 Sea Surface Temperature (SST) signals and correlated them with regions experiencing unprecedented heat waves in 2022, namely, the Indian Ocean, the North Atlantic around England and Spain, and the Mediterranean Sea. The signal's power spectrum and its three highest power components are determined based on the signal's Singular Spectrum Analysis (SSA) for each region. Furthermore, the power spectrum coherence (PSC) of Niño 3.4 and other study regions is obtained to determine whether ENSO and heatwaves are linked. We find that Niño 3.4 and the Indian Ocean have the same dominant frequency for the highest power received, indicating ENSO's influence on the Indian heat wave. Additionally, we discovered that in March 2022, the Jet stream is essential in bringing warm Arctic waves southward, passing through Niño 3.4 and India. Furthermore, we found that no other region shared the dominant frequency of the Niño 3.4 region.

关键词： Heating systems Couplings Sea surface Precipitation Surface waves Indian Ocean Geoscience and remote sensing

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Bionomic Characterisation of Benthic Communities on Rocky Shores of Lipsi Island (Aegean Sea, Greece)

Bionomic Characterisation of Benthic Communities on Rocky Sh...

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IEEE International Workshop on Metrology for the Sea;Learning to Measure Sea Health Parameters (MetroSea)

作者： Francesca Lauricella Maria Morán-Garcìa Maurice Calton Seal Anastasia Miliou Laura Macrina Dipartimento di Scienze della Terra dell'Ambiente e della Vita Università degli Studi di Genova Genova Italy Archipelagos Institute of Marine Conservation Pythagorio Greece Marine Science Program Biological and Environmental Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Archipelagos Institute of Maarine Conservation Samos Greece

ISBN: (数字)9798350379006

ISBN: (纸本)9798350379013

Rocky shores are important transitional environments between terrestrial and marine ecosystems. Although the Greek coastline is the largest in the Mediterranean basin, scant information is available regarding the benthic communities populating its shores. Here, we characterised the benthic communities inhabiting the rocky shores of Lipsi Island (Greece). The littoral zones of nine different sites were surveyed by randomly selecting 10 photo-quadrats from each zone, and estimating species richness, coverage, and abundance of the OTUs (Operational Taxonomic Units) recorded. Data analysis consisted of a comparison among the littoral zones, followed by comparisons between sheltered and exposed sites. A total of 44 OTU s were identified with the presence of a single Non-Indigenous Species (NIS), the algae Caulerpa cylindracea. The results showed a steep increase in species richness and coverage from the supralittoral to the upper infralittoral zone, most likely due to the mild environmental conditions of this zone in comparison with the other two zones. Species richness, mean coverage and abundance of organisms were found to be higher at sheltered sites, except for the supralittoral zone, where Melarhaphe neritoides was more abundant at exposed sites, most likely due to the continuous wetting of spraying water. Filter-feeders and species well adapted to high hydrodynamic conditions were mostly found at the exposed sites, while turf showed a higher coverage at sheltered sites, underlining the effect of wave exposure in shaping the composition of shallow benthic communities. This study provides a first description of the benthic communities inhabiting the rocky shores of Lipsi Island, establishing an important baseline to assess potential future alterations and develop conservation measures.

关键词： Coastlines Data analysis Conferences Sea measurements Spraying Algae Metrology Marine ecosystems Hydrodynamics environmental management

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Theoretical and Experimental Studies on Characterisation and Collection of Particulate Matter in Single-Wire, Single-Stage Electrostatic Precipitator with Square Cross-Section

SSRN

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SSRN 2024年

Electrostatic precipitation (ESP) is a technology widely used to remove particulate matter (PM) from industrial gas streams. To adopt the same for varying scales as well as for different clean air delivery applications, there exists a requirement for the development of comprehensive, readily adaptable, reasonably good, comparable, rigorous, step-by-step analytical theory and experimental validation of same for design of modular units of ESP. In this regard, current study conducted theoretical and experimental studies to investigate corona characterisation and PM collection efficiency in a modular unit of a single-wire, single-stage, wire-plate ESP with square cross-sectional geometry. The theory integrated the corona discharge with particle transport while the experimental study was conducted using a laboratory scale ESP. Best agreement between I-V characteristics of theory and experiment was obtained while adjusting inception electric field to 12.35´105 Vm-1 as well as the ion diffusion coefficient value to 0.0647´10-4 m2s-1. Relative error for local minimum efficiency between theory as well as experiment for three tested flow rates 30 LPM, 50 LPM and 100 LPM were 5.37%, 1.36%, 14.58% and was 1.36%, 7.52% and 6.23% for three potentials 9 kV, 11 kV as we all as 13 kV respectively. As accuracy and reliability of present model are verified in terms of collecting efficiency at different operating conditions, present model can facilitate the design and scale-up of ESPs for indoor PM control with high collection efficiency. The study also illustrated a sample calculation on the applicability of this filter-less technology for air cleaning in an indoor environment. © 2024, The Authors. All rights reserved.

关键词： Electrostatic precipitators

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α1,3-fucosylation treatment improves cord blood CD34 negative hematopoietic stem cell navigation

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iscience 2024年第2期27卷 108882页

作者： Al-Amoodi, Asma S. Kai, Jing Li, Yanyan Malki, Jana S. Alghamdi, Abdullah Al-Ghuneim, Arwa Saera-Vila, Alfonso Habuchi, Satoshi Merzaban, Jasmeen S. Bioscience Program Biological and Environmental Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Sequentia Biotech SL Barcelona Spain KAUST Smart-Health Initiative King Abdullah University of Science and Technology Thuwal Saudi Arabia

For almost two decades, clinicians have overlooked the diagnostic potential of CD34neg hematopoietic stem cells because of their limited homing capacity relative to CD34posHSCs when injected intravenously. This has co... 详细信息

For almost two decades, clinicians have overlooked the diagnostic potential of CD34^neg hematopoietic stem cells because of their limited homing capacity relative to CD34^posHSCs when injected intravenously. This has contributed to the lack of appeal of using umbilical cord blood in HSC transplantation because its stem cell count is lower than bone marrow. The present study reveals that the homing and engraftment of CD34^negHSCs can be improved by adding the Sialyl Lewis X molecule via α1,3-fucosylation. This unlocks the potential for using this more primitive stem cell to treat blood disorders because our findings show CD34^negHSCs have the capacity to regenerate cells in the bone marrow of mice for several months. Furthermore, our RNA sequencing analysis revealed that CD34^negHSCs have unique adhesion pathways, downregulated in CD34^posHSCs, that facilitate interaction with the bone marrow niche. Our findings suggest that CD34^neg cells will best thrive when the HSC resides in its microenvironment. © 2024 The Author(s)

关键词： Immunology Stem cells research Transcriptomics

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Biological methane production coupled with sulfur oxidation in a microbial electrosynthesis system without organic substrates

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Journal of environmental sciences 2022年第6期34卷 68-78页

作者： Ha T.T.Dinh Hiromi Kambara Shuji Matsushita Yoshiteru Aoi Tomonori Kindaichi Noriatsu Ozaki Akiyoshi Ohashi Department of Civil and Environmental Engineering Graduate School of Advanced Science and EngineeringHiroshima University1-4-1KagamiyamaHigashihiroshimaHiroshima 739-8527Japan Faculty of Environment Ho Chi Minh City University of Natural Resources and Environment236 Le Van Sy1 WardTan Binh DistrictHo Chi Minh CityViet Nam Agricultural Technology Research Center Hiroshima Prefectural Technology Research Institute6869HaraHachihonmatsuHigashihiroshimaHiroshima 739-0151Japan Program of Biotechnology Graduate School of Integrated Sciences for LifeHiroshima University1-3-1KagamiyamaHigashihiroshimaHiroshima 739-8530Japan

Methane is produced in a microbial electrosynthesis system(MES) without organic substrates. However, a relatively high applied voltage is required for the bioelectrical *** this study, we demonstrated that electrotrophic methane production at the biocathode was achieved even at a very low voltage of 0.1 V in an MES, in which abiotic HS-oxidized to SO_(4)^(2-) at the anodic carbon-cloth surface coated with platinum powder. In addition, microbial community analysis revealed the most probable pathway for methane production from electrons. First, electrotrophic H_(2) was produced by syntrophic bacteria, such as Syntrophorhabdus, Syntrophobacter, Syntrophus, Leptolinea, and Aminicenantales, with the direct acceptance of electrons at the biocathode. Subsequently, most of the produced H_(2) was converted to acetate by homoacetogens, such as Clostridium and Spirochaeta 2. In conclusion,the majority of the methane was indirectly produced by a large population of acetoclastic methanogens, namely Methanosaeta, via acetate. Further, hydrogenotrophic methanogens,including Methanobacterium and Methanolinea, produced methane via H_(2).

关键词： Bioelectricity Homoacetogens Methane production Microbial electrosynthesis system Sulfur oxidation

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Investigation of Cyanobacteria-Hosted Antibiotic Resistance Genes in Cyanohab-Impacted Drinking Water Sources

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SSRN 2025年

作者： Volk, Abigail Mills, Molly Chae, Soryong Lee, Jiyoung Division of Environmental Health Sciences College of Public Health The Ohio State University ColumbusOH United States Environmental Sciences Graduate Program The Ohio State University ColumbusOH United States Department of Chemical and Environmental Engineering University of Cincinnati CincinnatiOH United States Department of Food Science and Technology The Ohio State University ColumbusOH United States Infectious Diseases Institute The Ohio State University ColumbusOH United States

Freshwater cyanobacterial blooms (cyanoHABs) produce cyanotoxins that cause human and animal illness. cyanoHABs are also hypothesized to play a role in the antibiotic resistome, but whether Cyanobacteria host clinically-relevant antibiotic resistant genes (ARGs) in the environment is largely unknown. To investigate this emerging issue, we looked for the presence of Cyanobacteria-hosted ARGs using shotgun metagenomic sequencing of drinking water source samples collected during the 2022 bloom season from Lake Erie and Grand Lake St. Marys (GLSM). . ARGs were annotated using DeepARG and Resistance Gene Identifier (RGI). Cyanobacteria were annotated to host genes conferring possible antibiotic resistance. Two of these genes were rpoB2 and arlR, but these genes were likely spurious hits on housekeeping genes. qac and OXA genes were also annotated. While those hits suggest potential resistance to clinical antibiotics, overall Cyanobacteria did not host appreciable clinically-relevant ARGs. Because the two drinking water sources historically have high cyanotoxin concentrations, selected cyanotoxins, Cyanobacteria, and ARGs were chosen for quantification. We found high levels of Microcystis in Lake Erie and Planktothrix in GLSM, and high microcystin concentrations in GLSM, supporting previous trends in these water bodies. This study takes a novel approach pairing the issues of cyanoHABs and ARGs together in two drinking water sources. In a changing climate, drinking water treatment strategies should consider the treatment and public health implications of multiple contaminants. © 2025, The Authors. All rights reserved.

关键词： Lakes

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High fluorescent carbon dots/Ag as a sensitive sensor for tetracycline waste in aqueous solution 10

High fluorescent carbon dots/Ag as a sensitive sensor for te...

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10th International Seminar on New Paradigm and Innovation of Natural sciences and itsApplication, ISNPINSA 2020

作者： Alkian, I. Sutanto, H. Hadiyanto, H. Hidayanto, E. Hapsari, H.P. Wibowo, A.A. Syahida, A.N. Irianti, F.D.D. Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Departemen of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia Departemen of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Smart Materials Research Center Laboratory Diponegoro University Semarang Indonesia

Currently, antibiotics waste produced by hospitals and pharmacies is increasing, increasing demand and public consumption. Tetracyclines are a popular type of antibiotic that can pollute the environment even in low concentrations. This study aimed to detect tetracyclines in an aqueous environment using C-dots/Ag. C-dots material was synthesized by microwave radiation method with the addition of Ag 0-4 %. C-dots/Ag is produced in the form of a brown-black powder that glows green. FTIR testing shows that C-dots/Ag contains various functional groups O-H, N-H, C-H, C=O, and C=C. The surface morphology of the C-dots based on SEM testing is round and rough. Ag's addition causes C-dots' surface morphology to agglomerate, shifting the C-dots' absorbance peaks towards a larger wavelength and decreasing the energy bandgap. C-dots/Ag 2% has the best optical properties based on the intensity of the resulting fluency. In general, C-dots/Ag has excellent potential to be a susceptible, selective, and effective tetracycline detection agent. © Published under licence by IOP Publishing Ltd.

关键词： Surface morphology

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Developing a novel Temporal Air-quality Risk Index using LSTM autoencoder: A case study with South Korean air quality data

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science of the Total Environment 2025年 978卷 179303页

作者： Park, Hyerim Sohn, Wonho Kang, Eunjin Im, Jungho Lee, Junghye Technology Management Economics and Policy Program Seoul National University 1 Gwanak-ro Seoul08826 Korea Republic of Department of Industrial Engineering Ulsan National Institute of Science and Technology 50 UNIST-gil Ulsan44919 Korea Republic of Department of Civil Urban Earth Environmental Engineering Ulsan National Institute of Science and Technology 50 UNIST-gil Ulsan44919 Korea Republic of Institute of Engineering Research Seoul National University 1 Gwanak-ro Seoul08826 Korea Republic of of Engineering Practice Seoul National University 1 Gwanak-ro Seoul08826 Korea Republic of

As public awareness of environmental and health issues grows, providing accurate and accessible environmental risk information is essential for informed decision-making. environmental indices simplify the complex impacts of various environmental factors into a single, interpretable score. The Air Quality Index (AQI) and Air Quality Health Index (AQHI), a widely recognized standard, reflects health risks posed by air pollution but has significant limitations. Conventional index calculations often focus on the single most hazardous pollutant or ignore the combined and cumulative effects of multiple pollutants. Additionally, the commonly used linear and arithmetic approaches can misrepresent actual risks and fail to capture the temporal dynamics of environmental factors. To address these limitations, we propose a deep learning framework for developing a more comprehensive air quality index, the Temporal Air-quality Risk Index (TARI). This framework employs a long short-term memory (LSTM) autoencoder to capture complex interactions and temporal dependencies among environmental factors. By incorporating a risk score (RS) that captures non-linear and continuous risks, TARI provides a more accurate assessment of the environmental impact on health. A case study using real air quality data from South Korea demonstrates that TARI outperforms the Korean Comprehensive Air-quality Index (CAI) and AQHI, exhibiting stronger correlations with disease prevalence. These results highlight TARI's improved sensitivity and relevance in assessing health risks, particularly by addressing cumulative and temporal pollutant effects. To our knowledge, this study is the first to apply deep learning to environmental index development, offering a flexible and robust framework with potential applications across diverse environmental systems. © 2025 Elsevier B.V.

关键词： Haze pollution

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Relative extents, mechanisms, and kinetics of fluoride removal from synthetic groundwater by prevalent sorbents

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Chemosphere 2023年 342卷 140161页

作者： Ekamparam, Aravinth Siva Subramaniam Khaitan, Harshit Nimesh, Vishakha Singh, Abhas Department of Civil Engineering Indian Institute of Technology Kanpur Uttar Pradesh 208 016 India Environmental Geochemistry Laboratory Centre for Environmental Science and Engineering Indian Institute of Technology Kanpur Uttar Pradesh 208 016 India Department of Biological & Ecological Engineering Oregon State University CorvallisOR97331 United States Google India Telangana Hyderabad500 081 India Environmental Engineering and Management Program Indian Institute of Technology Kanpur Uttar Pradesh 208 016 India Department of Environment Management Systems East Delhi Municipal Corporation Government of Delhi New Delhi110 096 India

Fluoride (F) contamination in groundwater affects millions of people across the world. Although several sorbents have been identified for low-cost F removal, the choice of the optimal sorbent is dictated by the specific chemistry of contaminated groundwater. In this contribution, eight prevalent sorbents—activated alumina (AA), calcite, hydroxyapatite-coated calcite (HCC), natural chitosan, chalk, Mg–Al–CO3 layered double hydroxide (LDH), calcined Mg–Al–CO3 LDH (cLDH), and hydrous ferric oxide (HFO)—were categorized on their relative F removal mechanisms, extents, and kinetics from a typical synthetic groundwater, representative of contaminated aquifers of North India. Initially, batch experiments containing sorbents at 4 g·L−1 were conducted at a high F concentration (2.9 mM). The dominant F removal processes were identified by aqueous- and solid-phase characterization of reaction by-products. While chalk and calcite removed F by secondary precipitation of fluorite, HCC removed F by fluorapatite precipitation, and other sorbents removed F by sorption. Depending on the immobilization mechanism identified, the F uptake kinetics on each sorbent was modeled with either pseudo-second order or generalized rate equations. Among sorptive F uptake, cLDH exhibited the highest (10−2.15 mg·g−1·h−1) and HFO showed the lowest (10−4.15 mg·g−1·h−1) rates. Fluoride removal by precipitation was the fastest with chalk at 10−1.3 (h−1) (0.16). Subsequent experiments with AA and HCC at lower initial F concentration (0.42 mM) suggested increased uptake by ∼30x and ∼7x, respectively, relative to uptake in 2.9 mM initial F systems. For AA, apart from the widely-accepted mechanism of adsorption, an unidentified F-containing surface precipitate was formed. HCC was identified as the most promising sorbent with no sludge generation. © 2023 Elsevier Ltd

关键词： Sorbents

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