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Intensifying intermittent aeration for optimizing nutrient and hormone removal in vertical-flow constructed wetlands filled with aerated concrete

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Chemosphere 2025年 370卷 143941页

作者： Donato, Mayra Alves de Oliveira Souza, Adelania Pacheco, Amanda de Carvalho Silva, Lucas Svenar, Silvana Nagalli, André Passig, Fernando Hermes Brasil Bernardelli, Jossy Karla Querne de Carvalho, Karina - Civil Engineering Graduate Program. Deputado Heitor de Alencar Furtado St. 5000 Ecoville Paraná Curitiba81280-340 Brazil – Environmental Sciences and Technology Graduate Program. Deputado Heitor de Alencar Furtado St. 5000 Ecoville Paraná Curitiba81280-340 Brazil - Civil Construction Academic Department Deputado Heitor de Alencar Furtado St. 5000 Ecoville Paraná Curitiba81280-340 Brazil - Biology and Chemistry Academic Department. Deputado Heitor de Alencar Furtado St. 5000 Ecoville Paraná Curitiba81280-340 Brazil

Operational strategies have been applied in constructed wetlands to optimize the removal of nutrients and hormones that are still a concern in wastewater treatment. The strategy of intensifying intermittent aeration was investigated in two microcosm-scale vertical-flow constructed wetlands (VFCWs) planted with Eichhornia crassipes onto autoclaved aerated concrete (AC) in the removal of nutrients, estrone (E1), 17β-estradiol (E2) and 17α-ethinylestradiol (EE2). CW-1 (2.4 LO2 min−1) and CW-2 (1.4 LO2 min−1) were fed with synthetic wastewater in sequencing-batch mode (cycles 48-48-72 h) and intermittently aerated for 1 h, followed by 7 h without aeration for 377 days. Combined with the intensification strategy, the use of planted free-floating macrophytes and concrete-based material (emergent) as filtering media stand out as the innovation and originality aspects of this study. Despite the hormone addition, intensifying aeration enhanced the efficiencies since CW-1 achieved the highest removals with 91% COD, 77% TN, 74% TAN, 60% nitrate, and 97% TP in Stage I (no hormone addition) and 90% COD, 80% TN, 93% TAN, 63% nitrate, and 82% TP in Stage II (with hormone addition). CW-1 achieved the highest removal efficiencies of E1 (84%), E2 (95%), and EE2 (73%). Conversely, the efficiencies decreased under the lower aeration rate (in CW-2) for all parameters. Macrophyte uptake and adsorption stood out for TN (>60.25%) and TP (>27.6%) removal as the main mechanisms in the VFCWs. The characteristics of AC favored ion exchange and precipitation, reinforcing the potential of this material as filtering media in VFCWs. Intensification of intermittent aeration combined with hormone addition diverse and riched the microbial community with the presence of Thauera, Lentimicrobium (denitrification), Candidatus Accumulibacter (phosphorus removal), Pseudomonas, Fusibacter, and Azoarcus (EE2 degradation). Intensifying intermittent aeration was an important strategy to enhance the simultaneou

关键词： Wastewater treatment

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EVALUATION OF A MODIFIED-MODEL FOR DEEP BED FILTRATION

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WATER RESEARCH 1994年第2期28卷 335-342页

作者： TOBIASON, JE VIGNESWARAN, B Environmental Engineering Program Department of Civil Engineering University of Massachusetts at Amherst Amherst MA 01003 U.S.A.

The status of fundamental models of the performance of deep bed filters is reviewed and a modified model for monodisperse suspensions is presented. Particle removal is described by a modified version of the Vigneswaran and Tulachan model for the complete cycle of transient filter performance. A modification of the O'Melia and Ali approach and two linear approaches for headless modeling are also described. The sensitivity of model predictions to variations in parameter values is presented. A comparison with experimental results for ripening and steady state conditions shows that particle removal can be described well while the observed linear (with time) headless results cannot be described by modifications of the O'Melia and Ali approach. A surface area based linear headless model appears to capture the effects of suspended particle size on headless development while effects of coagulant type must be described by changes in model parameter values.

关键词： DEEP BED FILTRATION NONDISPERSE PARTICLE REMOVAL HEADLOSS EXPERIMENTAL RESULTS MODELING MODEL PARAMETERS

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Heat stress in landfill environments: Evaluating worker exposure and occupational risks

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and environmental engineering 2025年 11卷

作者： Abidin, Azham Umar Munawaroh, Anisful Lailil Rosinta, Aulia Sulistiyani, Arvi Tri Department of Environmental Engineering Faculty of Civil Engineering and Planning Universitas Islam Indonesia Indonesia Department of Information and Medical Service Vocational School Applied Master's Program in Occupational Health and Safety Universitas Gadjah Mada Indonesia Department of Community Family and Occupational Medicine Faculty of Medicine Khon Kaen University Thailand Faculty of Medicine Universitas Islam Indonesia Indonesia

Heat stress is a notable occupational health hazard, particularly because global climate change intensified environmental heat exposure. Workers in high-temperature environments, such as landfill sites, encounter significant health risks associated with heat stress, including dehydration, excessive sweating, fatigue, headaches, and potentially more severe conditions. This study examined landfill workers in Yogyakarta, where outdoor conditions increased their susceptibility to heat-related hazards. This study aimed to quantify heat stress in landfill operations via objective data analysis, which refers to the quantitative assessment of environmental heat conditions using the wet bulb globe temperature (WBGT) index, with the goal of informing practical interventions and improving worker health and safety protocols. This cross-sectional study, a type of observational research design, examined data collected at specific points in time. This study involved 39 landfill workers, with WBGT measurements collected at 25 sampling locations in the morning, daylight, and afternoon. This study evaluated the risk of heat stress at various times of the day using WBGT values. The results demonstrated notable fluctuations in WBGT, with peak levels occurring in daylight, consequently increasing the risk of heat stress. Age and body weight are significant factors because older individuals and those with increased body mass exhibit heightened susceptibility to heat retention. Statistical analysis revealed significant differences in WBGT measurements between morning and daylight and between daylight and afternoon (p < 0.001). These findings highlight the necessity for timely monitoring and management strategies to reduce heat stress risk, especially during daylight hours. © 2025 The Authors

关键词： Climate change Heat stress Occupational health Wet bulb globe temperature Workers

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Correction to: The perception of plastic waste and composition of boathouse waste in floating villages on Tonlé Sap Lake, Cambodia (Clean Technologies and environmental Policy, (2024), 10.1007/s10098-024-03108-2)

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Clean Technologies and environmental Policy 2025年 1-1页

作者： Habuer Fujiwara, Takeshi Vin, Spoann Chandara, Phat Tsukiji, Makoto Environmental Management Course Architecture Civil Engineering and Environmental Management Program School of Engineering Okayama University 3-1-1 Tsushima Naka Kita-Ku Okayama700-8530 Japan Department of Economic Development Faculty of Development Studies Royal University of Phnom Penh Russian Federation Boulevard Toul Kork Phnom Penh12156 Cambodia Department of Natural Resource Management and Development Faculty of Development Studies Royal University of Phnom Penh Russian Federation Boulevard Toul Kork Phnom Penh12156 Cambodia

In this article, the author’s name Habuer was incorrectly written as Mongolian Habuer. Incorrect version: Mongolian Habuer1 · Takeshi Fujiwara1 · Spoann Vin2 · Phat Chandara3 · Makoto Tsukiji1 Corrected version: Habuer1 · Takeshi Fujiwara1 · Spoann Vin2 · Phat Chandara3 · Makoto Tsukiji1 The original article has been corrected. © The Author(s) 2025.

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MODELING OF TRACE ORGANICS BIOTRANSFORMATION IN THE SUBSURFACE

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GROUND WATER 1984年第4期22卷 433-440页

作者： BOUWER, EJ MCCARTY, PL Environmental Engineering Program Department of Civil Engineering University of Houston—University Park Houston Texas 77004. Environmental Engineering and Science Civil Engineering Department Stanford California 94305.

Biofilm processes are potentially important for transformation of organic micropollutants in ground water. Some theoretical hypotheses and empirical observations suggest that a concentration threshold exists for some compounds below which the concentration cannot be reduced by bacterial action. In the presence of 1 compound at a relatively high concentration, termed the primary substrate, another compound present at trace concentrations, termed the secondary substrate, can be biotransformed as well. These concepts were evaluated through laboratory column studies with several halogenated organic compounds of importance in ground water. A biofilm model successfully described utilization of trace substrates, and application to modeling the subsurface was discussed. A simplified batch model with 1st order kinetics may have been adequate for describing subsurface microbial processes when low active organism and pollutant concentrations existed over a large scale.

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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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Numerical simulation of mechanical breakup of river ice-cover

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Journal of Hydrodynamics 2013年第3期25卷 415-421页

作者：王军何亮陈胖胖 SUI Jueyi School of Civil Engineering Hefei University of Technology Environmental Engineering Program University of Northern British Columbia Prince George Bristish ColumbiaCanada

Ice jams and ice dams in rivers will cause significant rises of water levels. Under extreme conditions, the ice flooding during winter or early spring may occur. In this paper, by considering the fluid-solid coupling effect caused by the water and the ice cover, the mechanisms of the mechanical breakup of the river ice cover are studied. A formula is obtained for determining whether or not the mechanical breakup process would happen under the hydraulic pressure of the flow. Combined with the hydraulic model under the ice covered flow, a numerical model is built and the interaction between the discharge, the hydraulic pressure under the ice cover and the date for the mechanical breakup of the river ice cover is simulated. The simulated results of the dates for the mecha- nical breakup of the river ice cover agree very well with the field observations of the breakups of the river ice cover in the Hequ Reach of the Yellow River. Therefore, the numerical model might serve as a good preliminary step in studying the breakup of the river ice-cover, evidencing many important parameters that affect the ice-cover process,

关键词： criterion for breakup fluid-solid coupling effect Hequ Reach of the Yellow River ice cover mechanical breakup,numerical model

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FURTHER APPLICATION OF ENDOCHRONIC CONSTITUTIVE EQUATION TO LOADING WITH NON-PROPORTIONAL AXIAL-TORSIONAL STRAIN-PATH

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INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS 1985年第1期20卷 41-52页

作者： WU, HC YANG, CC CHU, SC Civil and Environmental Engineering Program The University of Iowa Iowa City IA 52242 U.S.A.

A combined theoretical-experimental investigation of the stress response to complex, non-proportional strain-paths in the axial-torsional strain space is reported in this paper. Type 304 stainless steel tubular specimens have been tested at a constant strain rate of 5 × 10 −4 per second. Two strain-paths have been investigated. The first path involves a cyclic axial straining and unstraining following a shear prestraining, and the second strain-path is cyclic in shear after a prestraining in tension. The endochronic theory with a plastic strain defined intrinsic time has been shown to be capable of predicting the stress response to the two strain-paths considered.

关键词： STRESSES

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Harnessing machine learning for transmembrane pressure prediction in MBR systems during textile wastewater treatment

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Desalination and Water Treatment 2025年 322卷

作者： Zahoor, Onaira Khan, Sher Jamal Usama, Muhammad Tanudjaja, Henry J. Ghaffour, Noreddine Nawaz, Muhammad Saqib Institute of Environmental Sciences and Engineering (IESE) School of Civil and Environmental Engineering (SCEE) National University of Sciences and Technology (NUST) Sector H-12 Islamabad Pakistan Department of Civil and Environmental Engineering Northeastern University Boston 02115 MA United States Environmental Science and Engineering Program Division of Biological and Environmental Science and Engineering (BESE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Membrane Bioreactors (MBRs) are preferred for treating high-strength industrial wastewater due to their exceptional treatment efficiency and compact design. However, membrane fouling remains a significant challenge that limits their broader application. Since transmembrane pressure (TMP) is closely associated with membrane fouling mechanisms, its accurate prediction is essential for anticipating fouling events. This study focuses on predicting TMP in a bench-scale MBR by employing advanced regression models such as Lasso, support vector machines, and random forest. The bioreactor is operated using synthetic textile wastewater, with a primary focus on critical sludge parameters. A total of 60 datasets were compiled for training and testing of the models. The random forest model attained an R² of 0.95 and 0.86 and root mean square error values of 1.75 kPa and 3.3 kPa for the training and test datasets, respectively, demonstrating the best predictive accuracy. Extra polymeric substances were the most influential parameter, while particle size distribution was the least. The random forest and lasso regression models predicted high values more accurately, while the support vector regression model was inclined towards making more conservative predictions for extreme values. The effectiveness of the proposed models showcases the significance of utilizing machine learning in advancing MBR technology for wastewater treatment. Accurate TMP predictions through machine learning can help in maintaining key parameters within optimal ranges, thereby reducing the likelihood of membrane fouling and enhancing system efficiency. © 2025 The Authors

关键词： Extra polymeric substances Machine learning models Membrane bioreactor Textile wastewater treatment Transmembrane pressure

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MEASUREMENT OF LABORATORY AND AMBIENT AEROSOLS WITH TEMPERATURE AND HUMIDITY CONTROLLED NEPHELOMETRY

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ATMOSPHERIC ENVIRONMENT 1985年第7期19卷 1181-1190页

作者： ROOD, MJ LARSON, TV COVERT, DS AHLQUIST, NC Environmental Engineering and Science Program Department of Civil Engineering FX-10 University of Washington WA 98195 U.S.A.

The relationships between fine particle light scattering extinction coefficient, relative humidity and temperature can be used to quantify sulfate mass concentration and composition for laboratory generated and ambient aerosols. This measurement involves the use of an integrating nephelometer as well as a system for controlling the temperature and relative humidity of the air directly upstream of the nephelometer. Recent improvements in the control of these variables has subsequently enhanced the ability to detect the presence of sulfate compounds in complex atmospheric mixtures. Measurements at 2 urban sites (Seattle, Washington and Riverside, California) indicate the presence of fine particle sulfate compounds mixed with more volatile compounds. Measurements at a background site (Ozette Lake, Washington) indicate a mixture of acidic sulfate compounds with compounds that are less volatile than (NH4)2SO4.

关键词： Aerosol sulfate hygroscopic thermal decomposition humidograph thermograph

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