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33rd International Ocean and Polar engineering Conference, ISOPE 2023

作者： Anggriani, Andi Dian Eka Mutsuda, Hidemi Nakashima, Takuji Ardianti, Andi Baso, Suandar Transportation and Environmental System Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima-shi Higashihiroshima Japan Transportation and Environmental Systems Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima-shi Higashihiroshima Japan Naval Architecture Study Program Hasanuddin University South Sulawesi Gowa Indonesia

ISBN: (纸本)9781880653807

A planing hull high-speed ferry with a stepped hull becomes a well-liked mode of water transportation for archipelago countries. On the other hand, the shape of steps on the bottom hull has not been recently taken into explicit consideration regarding the speed requirement and hydrodynamic properties. In this study, the step W shapes, were adopted to find the improved hydrodynamic performance in the planing conditions. To provide a more precise prediction of the pressure, velocity fields, and void fraction, the CFD was applied the Finite Volume Method (FVM) and coupled with Volume of Fluid Method (VOF) to capture air cavity The numerical conditions of the planing hull were trimmed by the stern with 2, and 3 degrees. This study discussed the air cavity that occurred behind the stepped area that can affect the hydrodynamic behaviour. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite volume method

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Remote sensing application using Landsat 8 images for water quality assessments

Remote sensing application using Landsat 8 images for water ...

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2022 International Conference on AeroSpace Science and Technology, ICASST 2022

作者： Cruz-Montes, E.E. Durango-Banquett, M.M. Torres-Bejarano, F.M. Campo-Daza, G.A. Padilla-Mendoza, C. Environmental Engineering Program Universidad de Córdoba Cra. 6 No. 77-305 Montería Colombia Departament of Environmental Engineering Universidad de Córdoba Cra. 6 No. 77-305 Montería Colombia

This study aims to implement remote sensing to determine water quality parameters. Based on the water quality parameters measurements on February 5, 2021, and the LANDSAT 8 satellite images reflectance values, statistical models were generated by the RLM method: Stepwise Regression in Matlab software and digital models through QGIS and ArcGIS Pro GIS. The models obtained for pH, temperature, and turbidity were above 0.6 R2, while dissolved oxygen was above 0.8, showing a good correlation between in situ and estimated data. It is important to avoid cloudy conditions covering the study area because they limit the mathematical models' application, altering or preventing the results from being generated. The implementation results of this type of technology are of great relevance for future projects, where water quality assessments can be made by using national and international regulations according to the use either for human consumption or for aquatic life protection. © Published under licence by IOP Publishing Ltd.

关键词： Landsat

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Prevention of Thermal Pollution of Groundwater near Open Loop Geothermal Energy Systems

Prevention of Thermal Pollution of Groundwater near Open Loo...

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World environmental and Water Resources Congress 2023: Adaptive Planning and Design in an Age of Risk and Uncertainty

作者： Neupauer, R.M. Okkonen, J. Tyson, E. Dept. of Civil Environmental and Architectural Engineering Univ. of Colorado Boulder BoulderCO United States Geological Survey of Finland Espoo Finland Environmental Engineering Program Univ. of Colorado Boulder BoulderCO United States

ISBN: (数字)9780784484852

ISBN: (纸本)9780784484852

Open loop geothermal energy systems (GES) extract groundwater through an extraction well, pass the water through a heat exchanger to remove or add heat, then reinject the cooled or heated water into the aquifer. Because the reinjected water has a different temperature than the ambient groundwater, reinjection creates a thermal plume that travels downgradient and can be harmful to downstream water users or ecosystems. The heat from the thermal plume dissipates as the plume travels through the aquifer, so after sufficiently long distances have been traveled, the water has returned to the ambient temperature of the aquifer. Thus, the sites chosen for GES should be located sufficiently far from temperature-sensitive ecosystems. We propose the adjoint method for identifying allowable locations of GES. With the adjoint method, information is propagated upgradient from the location of the ecosystem, such that only one adjoint simulation is required to evaluate the appropriateness of any location as a site for GES. The application of the adjoint method in this context requires the assumption that the water extraction and reinjection have a minimal influence on the flow field. In this work, the errors introduced by that assumption are evaluated, and a correction is developed to reduce the errors introduced by that assumption. The approach is applied and tested for a field site in Finland, where the ambient groundwater velocity is very low and therefore the extraction and reinjection of water at the GES substantially alters the flow field. © World environmental and Water Resources Congress *** rights reserved

关键词： Aquifers

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Limitations of conventional approaches to identify photochemically produced reactive intermediates involved in contaminant indirect photodegradation

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environmental SCIENCE-PROCESSES & IMPACTS 2023年第10期25卷 1694-1707页

作者： Milstead, Reid P. Berg, Stephanie M. Kelly, Bella M. Knellwolf, Christian D. Larson, Cooper J. Wammer, Kristine H. Remucal, Christina K. [a]Environmental Chemistry and Technology Program University of Wisconsin–Madison 660 N. Park St. Madison Wisconsin 53706 USA [b]Department of Chemistry University of St. Thomas St. Paul Minnesota 55105 USA [c]Department of Civil and Environmental Engineering University of Wisconsin – Madison Madison Wisconsin 53706 USA

Dissolved organic matter (DOM) mediated indirect photodegradation can play an important role in the degradation of aquatic contaminants. Predicting the rate of this process requires knowledge of the photochemically produced reactive intermediates (PPRI) that react with the compound of interest, as well as the ability of individual DOM samples to produce PPRI. Key PPRI are typically identified using quencher studies, yet this approach often leads to results that are difficult to interpret. In this work, we analyze the indirect photodegradation of atorvastatin, carbamazepine, sulfadiazine, and benzotriazole using a diverse set of 48 waters from natural and engineered aquatic systems. We use this large data set to evaluate relationships between PPRI formation and indirect photodegradation rate constants, which are directly compared to results using standard quenching experiments. These data demonstrate that triplet state DOM (3DOM) and singlet oxygen (1O2) are critical PPRI for atorvastatin, carbamazepine, and sulfadiazine, while hydroxyl radical (OH) contributes to the indirect photodegradation of benzotriazole. We caution against relying on quenching studies because quenching of 3DOM limits the formation of 1O2 and all studied quenchers react with OH. Furthermore, we show that DOM composition directly influences indirect photodegradation and that low molecular weight, microbial-like DOM is positively correlated with the indirect photodegradation rates of carbamazepine, sulfadiazine, and benzotriazole. This study highlights limitations in conventional approaches used to identify key photochemically produced intermediates involved in the indirect photodegradation of organic contaminants.

关键词： Rate constants

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Dry-season sources of riverine sediment from the tropical mixed urban-agricultural watershed of the Mun River Basin in northeastern Thailand

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International Journal of Sediment Research 2023年第2期38卷 240-252页

作者： Arika Bridhikitti Thayukorn Prabamroong Gaohuan Liu Environmental Engineering and Disaster Management Program School of Interdisciplinary Studies Mahidol University Kanchanaburi Campus Earth Science Research Center Mahidol University Kanchanaburi Campus Faculty of Environment and Resource Studies Mahasarakham University State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Northeastern(NE) Thailand is well recognized as the land for rice cropping and consequently, it is potentially contaminated with chemicals from soil fertilization, pest/weed control, and urban *** Mun River basin in NE Thailand principally is comprised of rice paddies and sedimentation in the river has been pronounced, but the studies on sediment source identification are limited. The current study aims to identify sediment sources in the Mun River basin and discuss possible impacts on ecosystems attributed to exposure to polluted sediment. The assessment relies upon physicochemical properties and heavy metal contents(iron(Fe), manganese(Mn), copper(Cu), chromium(Cr), nickel(Ni),and Zinc(Zn)) in the fine-grained sediment(<63 μm) taken from the Mun River basin and the Chi River in the dry season of 2020-2021. The findings revealed that the heavy metals in the sediment had not accumulated to levels of concern. Most sediment was from natural sources, including Fe-and Mn-rich sediment, Cr-dominant sediment, and Ni-and Cu-rich sediment. Fe-and Zn-rich sediment was, however, found in the urban watershed of Lam Ta Klong, and it could originate from mixed urban sources. Ferich sediment was predominant in the Mun River basin, which and could be a significant sink and source of toxic elements from agricultural and urban discharges. It is suggested that the toxic compounds in the sediment should be consistently monitored, whereas ecological and health risk assessment should be focused on the mobile forms.

关键词： Sediment Heavy metals Mun River Lower Mekong River Agriculture

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South America Is on Fire: An Urgent Call for National and Regional Actions

ACS ES&T Air

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ACS ES&T Air 2024年第1期2卷 1-3页

作者： Patricia Krecl Gabriel Yoshikazu Oukawa Eva Maria Mollinedo Veneros Admir Créso Targino Graduate Program in Environmental Engineering Federal University of Technology 86036-370 Londrina Brazil

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Machine learning in concrete science:applications,challenges,and best practices

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npj Computational Materials 2022年第1期8卷 1192-1208页

作者： Zhanzhao Li Jinyoung Yoon Rui Zhang Farshad Rajabipour Wil V.Srubar III Ismaila Dabo Aleksandra Radlińska Department of Civil and Environmental Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang-si10223Republic of Korea Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCO80309USA Materials Science and Engineering Program University of Colorado BoulderBoulderCO80309USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Concrete,as the most widely used construction material,is inextricably connected with human *** conceptual and methodological progress in concrete science,concrete formulation for target properties remains a challenging task due to the ever-increasing complexity of cementitious *** the ability to tackle complex tasks autonomously,machine learning(ML)has demonstrated its transformative potential in concrete *** the rapid adoption of ML for concrete mixture design,there is a need to understand methodological limitations and formulate best practices in this emerging computational ***,we review the areas in which ML has positively impacted concrete science,followed by a comprehensive discussion of the implementation,application,and interpretation of ML *** conclude by outlining future directions for the concrete community to fully exploit the capabilities of ML models.

关键词： concrete directions autonomous

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Modeling Erosion in Hollow Cylinder Tests: The Case of Low Pressure Under Variable Confining Stress 58

Modeling Erosion in Hollow Cylinder Tests: The Case of Low P...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Kakonitis, Panos Papaloizou, Loizos Gravanis, Elias Sarris, Ernestos University of Nicosia Department of Engineering Oil Gas and Energy Program Nicosia Cyprus University of Nicosia Department of Engineering Civil and Environmental Engineering Program Nicosia Cyprus Cyprus University of Technology Department of Civil Engineering and Geomatics Limassol Cyprus Eratosthenes Centre of Excellence Limassol Cyprus Aristotle University of Thessaloniki School of Geology Department of Minerology-Petrology-Economic Geology Thessaloniki Greece

ISBN: (纸本)9798331305086

Modelling the erosional behavior of rock cores in hollow cylinder tests is a formidable task because it involves coupled hydro-mechanical processes. In a recent work of the authors, we proposed semi-analytical hydro-mechanical framework for modelling erosion at laboratory scale through the hollow cylinder test. The model was based on the kinematic formulation of classic hydro-mechanical models a lso known as volumetric sand production models. The original formulation was constructed to include variable confining stress and flowrate conditions. In this new formulation, a power law dependency of the erosion coefficient λ with stress is incorporated to investigateits dependency on the variable external radial stress boundary condition reflected on the sand production curve. This is a significant update with respect to the previous formulation that assumed a constant sand production coefficient. Results show an improved performance with respect to experimental results. This model can be used to systema tically calibrate sand production coefficients for different types of rocks. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Cylinders (shapes)

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Electrochemical improvement of methane production via surface engineering of graphitic cathodes in anaerobic sequential batch reactors

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Journal of environmental Management 2025年 387卷 125826页

作者： Dash, Smruti Ranjan Choi, Hyungmin Song, Jae Keun Ko, Dayoung Lee, Changsoo Kim, Jeonghwan Department of Environmental Engineering Program of Environmental and Polymer Engineering Inharo-100 Michuhol-gu Incheon Korea Republic of Ulsan44919 Korea Republic of Ulsan44919 Korea Republic of

Five anaerobic sequential batch reactors (SBR), SBR 1−SBR 5 run in parallel were examined for biogas output trends under varying hydraulic retention times (HRT). SBR 1 was run without biomass for 1 month to study electrode stability and the effect of applied potential on sodium dodecyl sulfate (SDS) degradation. Polyaniline (PANI/Graphite) modification in reactors SBR 4 and iron-coated PANI (Fe-PANI/Graphite) in SBR 5 increased biogas production by almost 2.5 times compared to SBR 2 without electrodes. SBR 3 equipped with unmodified graphite rods was used as a control for cathode modifications. By decreasing HRT, cumulative methane production increased to 280 and 320 mL at 72 h and 350 and 500 mL at 48 h. Compared to SBR 2, an electric field increased daily biogas production. Methane composition in SBR 5 increased from 44% at 96-h to 71% at 48-h HRT after 30 days. SBR 4 recovered within 7 days after HRT modifications reduced methane output. The methane yield increased significantly with electric current in SBR 3 (2.6 times), SBR 4 (5.4 times), and SBR 5 (7.4 times). The effluent total organic carbon was stabilized at 15 mg/L for SBR 2 and SBR 3 and improved to below 5 mg/L for SBR 4 and SBR 5 during reactor operation. SBR 5, equipped with an Fe-PANI/Graphite cathode showing the lowest charge transfer resistance, developed distinct microbial community structures in both anodic and cathodic biofilms, compared to the other electrically assisted SBRs. © 2025 Elsevier Ltd

关键词： Anaerobic sequential batch reactors Bio-electrochemical system Biogas production Cathode modification Electric field application

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Effectiveness of biomass-based fly ash in pulp and paper liquid waste treatment

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South African Journal of Chemical engineering 2022年 41卷 79-84页

作者： Arita, Susila Kristianti, Devi Komariah, Leily Nurul Chemical Engineering Department Faculty of Engineering Universitas Sriwijaya Indralaya 30662 Indonesia Environmental Management Program Universitas Sriwijaya Palembang 30139 Indonesia

Adsorption is regarded as one of the most promising and straightforward strategies for reducing organic pollutants from wastewater effluents. The use of adsorbents from economical raw materials, even those from waste, is one recent concern. This study aims to test the effectiveness of biomass-based fly ash in treating liquid waste from pulp and paper production activities. Fly ash (FA) performance for adsorption was tested by varying the ratio of adsorbent with wastewater by 20, 40, 60, and 80 g/L. The adsorbents' performance was then compared between the application of FA directly (without activation) and adsorbents that were previously calcinated in 100 °C and 200 °C. Samples of pulp and paper liquid waste are placed on the erlenmeyer flask and stirred using a jar test with speeds varying by 100, 200, and 300 rpm. The results showed that FA is potential directly used with no thermal treatment as an adsorbent in treating liquid waste in the pulp and paper industry. It was effectively used with a dosage of 20 g/L and a 100 rpm fatigue speed with a contact time of 10 min. The quality changes of several wastewater parameters were found with a 92.5% reduction in TSS, 83.31% in COD, 19.99% in chlorides, 95.41% in NH3, and 19.6% in TDS, 19.6% in EC. Those parameters have successfully complied with the regulation standard of Indonesia (SNI) for wastewater. © 2022 The Author(s)

关键词： Adsorbent Biomasss-based fly ash Pulp and paper mills Waste treatment

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