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A mechanistic study of ciprofloxacin adsorption by goethite in the presence of silver and titanium dioxide nanoparticles

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Journal of Environmental Sciences 2022年第8期34卷 46-56页

作者： Jie Tang Yun Wang Qiang Xue Fei Liu Kenneth CCarroll Xiaohua Lu Taogeng Zhou Dengjun Wang MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences(Beijing)Beijing 100083China Beijing Key Laboratory of Water Resources and Environmental Engineering School of Water Resources and EnvironmentChina University of Geosciences(Beijing)Beijing 100083China Water Science and Management Program New Mexico State UniversityMSC 3QUSA Plant&Environmental Science New Mexico State UniversityLas CrucesNM 88003USA National Institute of Metrology Beijing 100022China Beijing Institute of Technology Beijing 100081China School of Fisheries Aquaculture and Aquatic SciencesAuburn UniversityAuburnAL 36849USA

The adsorption behaviors of ciprofloxacin(CIP),a fluoroquinolone antibiotic,onto goethite(Gt)in the presence of silver and titanium dioxide nanoparticles(AgNPs and TiO_(2)NPs)were *** showed that CIP adsorption kinetics in Gt with or without NPs both followed the pseudo-second-order kinetic *** presence of AgNPs or TiO_(2)NPs inhibited the adsorption of CIP by *** amount of inhibition of CIP sorption due to AgNPs was decreased with an increase of solution pH from 5.0 to *** contrast,in the presence of TiO_(2)NPs,CIP adsorption by Gt was almost unchanged at pHs of 5.0∼6.5 but was decreased with an increase of pH from 6.5 to *** mechanisms of AgNPs and TiO_(2)NPs in inhibiting CIP adsorption by Gt were different,which was attributed to citrate coating of AgNPs resulting in competition with CIP for adsorption sites on Gt,while TiO_(2)NPs could compete with Gt for CIP ***,CIP was adsorbed by Gt or TiO_(2)NPs through a tridentate complex involving the bidentate inner-sphere coordination of the deprotonated carboxylic group and hydrogen bonding through the adjacent carbonyl group on the quinoline *** findings advance our understanding of the environmental behavior and fate of fluoroquinolone antibiotics in the presence of NPs.

关键词： Ciprofloxacin Goethite Silver nanoparticles Titanium dioxide nanoparticles Adsorption

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Flood hazard assessment in Kuala Langsa village, Langsa city, Aceh Province-Indonesia

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Isma, Faiz Kusuma, M.S. Badri Nugroho, E Oktariyanto Adityawan, M Bagus Civil Engineering Doctoral Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Center for Water Resources Development Faculty of Civil and Environmental Engineering Institut Teknologi Bandung School of Water Resources Engineering and Management Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Department of Civil Engineering Faculty of Engineering Universitas Samudra

This study evaluates the flood hazard index in Kuala Langsa Village, Langsa City, Aceh, a region prone to frequent flooding due to its low-lying coastal location in eastern Aceh. It serves as a crucial link between North Sumatra and Aceh provinces. The area's significance underscores the importance of understanding and mitigating flood risks. By utilizing the coupled 1D/2D Hydraulic model, flood hazards are accurately predicted and mapped. The field data collection (as calibration) measures the maximum tidal water level based on information from residents affected by flooding on the land surface under their houses. Hydrological conditions during the December 2017 flood event are simulated using HEC-HMS. Hydraulic conditions are evaluated using HEC-RAS 6.4.1. The research aims to assess the flood hazard index in Kuala Langsa Village under spring tide conditions, considering variations in base flow and flood flow with return periods of 2 and 50 years upstream. The main results show that an FHI >2.62 (high) covers an area of 169.74 ha, 2.62 > FHI >2.23 (moderate) encompasses 172.60 ha, and FHI <2.23 (low) accounts for 222.32 ha. During the Q50 upstream flood, there was an increase in flood extent: low by 61.20 %, medium by 25.32 %, and high by 5.57 %. These findings deepen our understanding of estuary flood mechanisms and emphasize the importance of developing more effective adaptation strategies to reduce flood risks in the future. © 2024 The Authors

关键词： Adaptation calibration Flood hazard index Hydraulic 1D/2D Hydrological Kuala Langsa village Tidal propagation

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Assessing long-term morphological changes in the Vietnamese Mekong Delta 12th

Assessing long-term morphological changes in the Vietnamese ...

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12th International Conference on Fluvial Hydraulics, River Flow 2024

作者： Ahmed, M.F. Binh, D.V. Nguyen, B.Q. Kantoush, S. Sumi, T. Doan, N.L.P. Tuan, L.A. Nguyen, N.T. Vuong, N.D. Vu, H.T. Thang, H.N. Quyen, L.V. Water Resources Research Center Disaster Prevention Research Institute Kyoto University Kyoto Uji-shi Japan Master program in Water Technology Reuse and Management Faculty of Engineering Vietnamese-German University Binh Duong Province Ben Cat Town Viet Nam University of Danang- University of Science and Technology Nguyen Luong Bang Danang Viet Nam Research Institute for Climate Change Can Tho University Ninh Kieu District Can Tho City Viet Nam Southern Institute for Water Resources Planning Ho Chi Minh City Viet Nam Faculty of Civil Engineering Technische Universität Dresden Germany Faculty of Fisheries University of Agriculture and Forestry Hue University Hue City Viet Nam

ISBN: (纸本)9781032757216

The Vietnamese Mekong Delta (VMD) has experienced significant morpho logical changes over decades, resulting in profound socioeconomic and environmental conse quences. This study investigated the VMD’s spatial and temporal morphological alterations from 1998 to 2020, utilizing four bathymetric datasets and remote sensing techniques. The ana lysis revealed that the average annual riverbed incision rate in the Tien and Hau Rivers dimin ished from-0.19 m/year (1998–2005) to-0.11 m/year (2005–2017) and further dropped to-0.10 m/year (2017–2020). The upper reaches of the Tien and Hau Rivers exhibited pronounce deepening over the three periods, whereas their lower reaches witnessed a converse trend. Add itionally, the study unveiled the average annual riverbank migration rate along the VMD, ran ging from 5 m/year to-5 m/year during the same examined periods. Notably, the dynamic processes of erosion and deposition intensified between 2017 and 2020. This research aims to provide crucial insights for refining sediment management strategies in the VMD. © 2025 The Author(s).

关键词： Miocene

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Biosorption of chromium by live and dead cells of Bacillus nitratireducens isolated from textile effluent

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Chemosphere 2024年 359卷 142389页

作者： Imron, Muhammad Fauzul Setiawan, Wahyu Putranto, Trisnadi Widyaleksono Catur Abdullah, Siti Rozaimah Sheikh Kurniawan, Setyo Budi Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft2628 Netherlands Study Program of Environmental Science Postgraduate Program Sriwijaya University Palembang30139 Indonesia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia

Bacillus nitratireducens was isolated from textile effluent and showed high tolerance to chromium (Cr), reaching up to a 1000 mg/L MIC value. This research was aimed at utilizing biosorbents from live and dead cells of B. nitratireducens to remove Cr from an aqueous solution. A batch biosorption test was performed, and mechanisms analysis was approached by an adsorption-desorption test, SEM-EDS, and FTIR analysis. Cr removal by dead cells in 25, 50, and 100 mg/L of Cr were 58.99 ± 0.7%, 69.8 ± 0.2%, and 82.87 ± 0.11%, respectively, while that by live cells was 73.08 ± 1.9%, 80.27 ± 6.33%, and 86.17 ± 1.93%, respectively. Live cells showed significantly higher Cr removal and adsorption capacities as compared to dead cells. In all concentrations, absorption contributed more than adsorption to the Cr removal by both live and dead cells. Absorption of Cr was subjected to occur due to passive mechanisms in dead cells while involving some active mechanisms in live cells. SEM-EDS confirmed the detection of Cr on the cell surface, while FTIR revealed the shifting of some peaks after the biosorption test, suggesting interactions between Cr and functional groups. Further TEM analysis is suggested to be conducted as a future approach to reveal the inner structure of cells and confirm the involvement of absorption mechanisms. © 2024 Elsevier Ltd

关键词： Heavy metals

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Analysis of Farm Pond Detention and Disaster Prevention Potential and Activation Improvement Strategy

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Journal of Chinese Soil and water Conservation 2022年第2期53卷 124-138页

作者： Lin, Shu-Hao Jang, Je-Yi Ph.D. Program for Civil Engineering Water Resources Engineering and Infrastructure Planning Feng Chia University Taichung Taiwan Water and Soil Conservation Bureau Conservation Management Team Reservoir Conservation Division Nantou Taiwan

Given the increasing rate of climate change in recent years, this study investigated the flood detention capacity of traditional farm ponds. The HEC-HMS model was used to evaluate the farm ponds in the water catchment areas of Neili, Lunshan, Dapo, and the Anyexi and Chaoyong Rivers. The investigation also cooperated with detailed survey operations to screen 76 farm ponds for flood detention potential and to estimate their inflow. The peak reduction rate in the 50-year return period was determined to be 83%, and the peak delay time was determined to be 27%. The peak reduction rate has increased significantly, indicating that farm ponds offer considerable potential for flood detention and disaster prevention. They can be regarded as a possible solution for the general dispersal of flood runoff and for reducing the impact of future natural disasters. © 2022 Chinese Soil and water Conservation Society. All rights reserved.

关键词： Farm ponds Flow hydrograph Peak attenuation

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Multivariate Return Period and Risk Analysis of Non-Stationary Extremes: Dynamic Drought Severity-Duration-Frequency in India

SSRN

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SSRN 2024年

作者： Sahana, V. Mondal, Arpita Water Risk to Development and Resilience International Water Management Institute Pusa New Delhi110012 India Department of Civil Engineering Indian Institute of Technology Bombay Mumbai Powai Mumbai400076 India Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai Powai Mumbai400076 India

Under changing environmental conditions, the inclusion of non-stationarity in risk assessment of hydroclimatic extremes provides reliable estimates of quantiles or design levels;however, such assessments are usually limited to univariate analysis. A multivariate non-stationary framework is capable of considering the interdependencies between multiple characteristics of such extreme events. This study offers a new non-stationary multivariate risk assessment framework based on the concepts of Expected Number of Events (ENE) and Expected Waiting Time (EWT) that have worked well in the recent past for return level estimates of univariate extremes under non-stationarity. The proposed framework is first demonstrated on synthetically generated multi-attribute datasets to prove its effectiveness for both increasing and decreasing trends in extremes. Further, real-world applicability of the approach is presented for multivariate non-stationary drought risk assessment in India, where dynamic copulas are used to capture the joint transient behaviour of drought severity and duration. The design severity and duration for any given return period increases (decreases) for positive (negative) trend in drought attributes, implying underestimation (overestimation) of risk by the stationarity approach. Globally, changes in characteristics of hydroclimatic extreme events are increasingly reported, and such changes are likely to be exacerbated by climate change. The proposed framework considers time-varying nature of multiple characteristics for risk assessment of such extremes, and can aide in engineering design and environment management. © 2024, The Authors. All rights reserved.

关键词： Risk assessment

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Spatiotemporal Analysis of Meteorological Drought Using Standardized Precipitation Index (SPI) in Gabiley Region, Somaliland

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Journal of Geoscience and Environment Protection 2023年第5期11卷 47-59页

作者： Abdisamad Abib Omar Jie-Lun Chiang Bashir Hassan Daud Department of Tropical Agriculture and International Cooperation National Pingtung University Science and Technology Taiwan Department of Soil and Water Conservation National Pingtung University Science and Technology Taiwan College of Engineering International Master Program on Natural Hazards Mitigation and Management National Cheng Kung University Taiwan

Drought is a common natural disaster worldwide, with varying durations, severity levels, and spatial extents. This study aimed to model the spatiotemporal variation of meteorological drought events in the Gabiley region of Somaliland. The study utilized primary data collected from the meteorological station in Gabiley and CHIRPS (Climate Hazards Group InfraRed Precipitation with Station) data to develop the standardized precipitation index (SPI) at a 3-month timescale. The results of the study revealed that the study area was characterized by drought and received inadequate precipitation, resulting in catastrophic droughts that negatively impacted the socioeconomic situation of the community. Mild-to-severe meteorological drought events occurred every two to three years, with the most severe droughts occurring in 1998, 2002, 2009, 2015, and 2017. Specifically, the year 2015 experienced the most severe meteorological drought in the region during the studied period. The predominant type of drought was a mild year in the study area. The SPI was found to potentially identify meteorological drought, making it a useful tool for policymakers as they develop drought adaptation and mitigation policies. This study provides valuable information that can benefit local authorities and policymakers in creating drought mitigation and adaptation strategies in the Gabiley region.

关键词： Meteorological Drought SPI CHRIPS Rainfall Gabiley

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Comparison of Taylor Galerkin and FTCS models for dam-break simulation 5

Comparison of Taylor Galerkin and FTCS models for dam-break ...

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5th International Seminar on Sustainable Urban Development, ISoSUD 2020

作者： Hafiyyan, Q. Adityawan, M.B. Harlan, D. Natakusumah, D.K. Magdalena, I. Graduate School of Civil Engineering Bandung Institute of Technology Jawa Barat Bandung Indonesia Center for Coastal and Marine Development Bandung Institute of Technology Jawa Barat Bandung Indonesia Study Program of Water Resouces Engineering and Management Bandung Institute of Technology Jawa Barat Bandung Indonesia Study Program of Water Resources Engineering Bandung Institute of Technology Jawa Barat Bandung Indonesia Industrial and Financial Mathematics Research Group Bandung Institute of Technology Jawa Barat Bandung Indonesia

The aim of this paper is to compare the ability of two numerical models to simulate two-dimensional dam-break flows. Dam-break modelling is important in reducing the high-risk of dam failure by determining the water flow movement and its effect on buildings downstream. In this study, the Taylor Galerkin and Forward Time Central Space method is presented to simulate 2-D dam-break flow. The Hansen filter is applied to both methods to reduce numerical instability oscillations in the model. The filters were used for each time step at each computing point. The model is verified by comparing the result simulation with numerical results from previous studies. The result show that Taylor Galerkin numerical scheme with Hansen filter is successful to simulate the problem of 2-D dam-break. Also, the Taylor Galerkin model has better results than the FTCS model. Studies like this are needed for mitigation efforts in the event of dam failure. © Published under licence by IOP Publishing Ltd.

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Rainfall frequency analysis using event-maximum rainfalls – An event-based mixture distribution modeling approach

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Weather and Climate Extremes 2024年 43卷

作者： Cheng, Ke-Sheng Chen, Bo-Yu Lin, Teng-Wei Nakamura, Kimihito Ruangrassamee, Piyatida Chikamori, Hidetaka Department of Bioenvironmental Systems Engineering National Taiwan University Taipei Taiwan Master Program in Statistics National Taiwan University Taipei Taiwan Graduate School of Agriculture Kyoto University Kyoto Japan Department of Water Resources Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Environmental Management Engineering Okayama University Okayama Japan

Rainfall frequency analysis, an essential work for water resources management, is often conducted by using the annual maximum rainfall series. For rainfall stations with short record lengths and outliers presence, the use of annual maximum series for rainfall frequency analysis may yield design rainfall estimates of higher uncertainties. Moreover, for regions with cyclostationary climate patterns, the annual maximum rainfalls may be caused by different prevalent storm types, which differ in terms of their occurrence frequency and storm rainfall characteristics. In this study, we propose a novel event-maximum-rainfall-based mixture distribution modeling approach for rainfall frequency analysis. By considering the event-maximum rainfalls of individual storm events, the sample size for parameter estimation increases, and the uncertainty of design rainfall estimates reduces. Mixture distribution modeling enables a thorough investigation of the contributing probabilities of different storm types to the annual maximum rainfall. Through rigorous stochastic simulation, we demonstrated the superiority of the proposed approach over the conventional annual maximum rainfall approach. The proposed approach was applied to four representative rainfall stations in Taiwan, and the results revealed that the proposed approach is more robust than the conventional annual maximum rainfall approach. The results provide insights into the contributions of individual storm types to the annual maximum rainfall. © 2023 The Authors

关键词： Annual maxima Event-maximum rainfalls Frequency analysis Mixture distribution Negative binomial distribution Poisson distribution

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Rainfall Frequency Analysis Using Event-Maximum Rainfalls – an Event-Based Mixture Distribution Modeling Approach

SSRN

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SSRN 2023年

作者： Cheng, Ke-Sheng Chen, Bo-Yu Lin, Teng-Wei Nakamura, Kimihito Ruangrasamee, Piyatida Chikamori, Hidetaka Department of Bioenvironmental Systems Engineering National Taiwan University Taipei Taiwan Master Program in Statistics National Taiwan University Taipei Taiwan Graduate School of Agriculture Kyoto University Kyoto Japan Department of Water Resources Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Environmental Management Engineering Okayama University Okayama Japan

Rainfall frequency analysis, an essential work for water resources management, is often conducted by using the annual maximum rainfall series. For rainfall stations with short record lengths and outliers presence, the use of annual maximum series for rainfall frequency analysis may yield design rainfall estimates of higher uncertainties. Moreover, for regions with cyclostationary climate patterns, the annual maximum rainfalls may be caused by different prevalent storm types, which differ in terms of their occurrence frequency and storm rainfall characteristics. In this study, we propose an event-maximum-rainfall-based mixture distribution modeling approach for rainfall frequency analysis. By considering the event-maximum rainfalls of individual storm events, the sample size for parameter estimation increases, and the uncertainty of design rainfall estimates reduces. Mixture distribution modeling enables a thorough investigation of the contributing probabilities of different storm types to the annual maximum rainfall. Through rigorous stochastic simulation, we demonstrated the superiority of the proposed approach over the conventional annual-maximum-rainfall approach. The proposed approach was applied to four representative rainfall stations in Taiwan, and the results revealed that the proposed approach is more robust than the conventional annual-maximum-rainfall approach. The results provide insights into the contributions of individual storm types to the annual maximum rainfall. © 2023, The Authors. All rights reserved.

关键词： Poisson distribution

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