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SSRN 2025年

作者： Mugula, Julius Nakayenga, Joyce Kido, Ryunosuke GuhaRay, Anasua Hata, Toshiro Civil and Environmental Engineering Program Hiroshima University 1-4-1 Kagamiyama Higashi Hiroshima Hiroshima City739-8527 Japan Department of Civil Engineering BITS Pilani Hyderabad Campus Jawahar Nagar Kapra Mandal Telangana Secunderabad500078 India Hiroshima University Japan

Steel slag, a by-product of the steel-making industry, offers potential for soil stabilization but remains underutilized in sandy soils due to challenges such as slow strength development, low water retention, particle segregation, and bleeding. Cellulose, a plant-based biopolymer, enhances soil water retention and may improve the performance of steel slag-treated *** study investigated the stabilization of Masado granite and Toyoura silica sands using steel slag and two forms of unhydrolyzed cellulose: cellulose powder (CP) and carboxymethyl cellulose (CMC). Sands were treated with steel slag at varying contents (0%, 10%, 15%, 30%, and 50%) to identify the optimal dosage and the most suitable sand based on unconfined compressive strength (UCS) and pozzolanic reactivity over 3, 7, 14, and 28 days. CP and CMC were added at 0%, 0.25%, 0.5%, 0.75%, and 1% to evaluate their effects on the UCS, flowability, compaction, mineralogy, and microstructure. The findings established 30% steel slag as the optimal dosage, enhancing UCS by 99.05%. Masado granite sand exhibited the highest UCS (558.85 kPa), outperforming Toyoura silica sand (34 kPa) due to better pozzolanic reactivity. Incorporating 0.5% cellulose further improved strength, with CMC and CP increasing UCS by 53.29% and 49.23%, respectively, through gel thread and fibrous network formation. These optimized composites reduced cement-related carbon emissions by 2.5% per kilometer of highway embankments, demonstrating their viability as sustainable and eco-friendly construction materials. © 2025, The Authors. All rights reserved.

关键词： Silica sand

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Nucleation effects of coccoliths in portland cement

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Matter 2025年

作者： Beatty, Danielle N. Srubar, Wil V. Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive UCB 027 BoulderCO80303 United States Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States

This work explores the use of photosynthesized coccoliths (intricate CaCO3 particles) as a nucleation agent or cement replacement in portland cement paste. First, coccoliths were produced and harvested from the marine microalgae Emiliania huxleyi and the particle size, morphology, and mineralogy were characterized. Then, the nucleation effects of E. huxleyi coccoliths as seeding agent (0.5, 1, 3, or 5 wt % additions) and limestone filler (5 and 15 wt % cement replacements) were studied using isothermal conduction calorimetry and compressive strength testing. The results were compared with five commercially available CaCO3 sources used as nucleation agents and fillers. While the high surface area of coccoliths (12.22 m2/g) enhanced water demand, it also enhanced nucleation during cement hydration without accelerating hydration, leading to enhanced early-age strength without detriments to 28-day strength. Results highlight a potential carbon reduction strategy, namely employing photosynthesis as a method of mineral admixture production, for the cement and concrete industry. © 2025 Elsevier Inc.

关键词： Portland cement

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GPU Implementation of a Gas-Phase Chemistry Solver in the CMAQ Chemical Transport Model

ACS ES&T air

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ACS ES&T air 2025年第2期2卷 226-235页

作者： Duncan Quevedo Khanh Do George Delic José Rodríguez-Borbón Bryan M Wong Cesunica E Ivey Department of Civil and Environmental Engineering University of California Berkeley California 94720 United States. Department of Chemical and Environmental Engineering University of California Riverside California 92557 United States. Center for Environmental Research and Technology Riverside California 92507 United States. Hiperism Consulting LLC Chapel Hill North Carolina 27514 United States. Department of Chemistry Department of Physics & Astronomy and Material Science & Engineering Program University of California Riverside California 92557 United States.

The Community Multiscale Air Quality (CMAQ) model simulates atmospheric phenomena, including advection, diffusion, gas-phase chemistry, aerosol physics and chemistry, and cloud processes. Gas-phase chemistry is often a major computational bottleneck due to its representation as large systems of coupled nonlinear stiff differential equations. We leverage the parallel computational performance of graphics processing unit (GPU) hardware to accelerate the numerical integration of these systems in CMAQ's CHEM module. Our implementation, dubbed CMAQ-CUDA, in reference to its use in the Compute Unified Device Architecture (CUDA) general purpose GPU (GPGPU) computing solution, migrates CMAQ's Rosenbrock solver from Fortran to CUDA Fortran. CMAQ-CUDA accelerates the Rosenbrock solver such that simulations using the chemical mechanisms RACM2, CB6R5, and SAPRC07 require only 51%, 50%, or 35% as much time, respectively, as CMAQv5.4 to complete a chemistry time step. Our results demonstrate that CMAQ is amenable to GPU acceleration and highlight a novel Rosenbrock solver implementation for reducing the computational burden imposed by the CHEM module.

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The fate of antibiotics during phosphate recovery processes - A critical review

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Science of the Total Environment 2025年 968卷 178829页

作者： Bolujoko, Nathaniel Duling, Addison Shashvatt, Utsav Mangalgiri, Kiranmayi Environmental Science Graduate Program Oklahoma State University 202 Whitehurst StillwaterOK74078 United States Department of Biosystems and Agricultural Engineering Oklahoma State University 215A Agricultural Hall StillwaterOK74078 United States Department of Civil and Environmental Engineering University of California Berkeley 760 Davis Hall BerkeleyCA94720 United States

The principles of circular economy encourage the recovery of phosphorus from nutrient-rich waste streams such as animal manure, domestic wastewater, and urine to supplement existing sources of raw phosphorus. However, these waste streams also contain a wide variety of contaminants of emerging concern including antibiotics, and the recovery of phosphorus from these waste streams results in the co-occurrence of antibiotics with the recovered phosphorus products. This paper provides a comprehensive overview of the fate of environmentally relevant antibiotics in three major existing and upcoming phosphorus recovery processes: precipitation-, membrane-, and adsorption-based treatment. In general, the co-occurrence of antibiotics in recovered phosphorus increases with the presence of dissolved organic matter (DOM) and cations due to π-π interaction and cationic bridge formation, respectively. Additionally, antibiotics display pH-based speciation resulting in electrostatic interactions with recovered phosphorus at pH > 7.0. Furthermore, this critical review establishes a new metric, the relative antibiotic-to‑phosphorus (RAP), defined as the ratio of the concentration of antibiotics to phosphorus in recovered phosphorus to that of the phosphorus-rich waste. Precipitation-based methods, particularly struvite, demonstrated the lowest RAP, while the RAP in carbon-based adsorbents was 1.8 × 108 times higher than in membrane-based processes. In reviewing literature on the fate of antibiotics in phosphorus recovery processes, several research needs are also highlighted: the fate of non-tetracycline antibiotics, simultaneous investigation of phosphorus and antibiotic fate in membrane- and adsorption-based methods, treatment methods to mitigate the co-occurrence of antibiotics in recovered phosphorus product, and the release of antibiotics from recovered phosphate products. © 2024

关键词： Rivers

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Navigating Legal Frameworks for National Resilience: A Comparative Analysis of Key Disaster Management Laws in Thailand and Japan

Navigating Legal Frameworks for National Resilience: A Compa...

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First International Symposium on Instrumentation, Control, Artificial Intelligence, and Robotics (ICA-SYMP)

作者： Ampan Laosunthara Ratchaneekorn Thongthip Kodchakorn Krutphong School of Environment and Society Institute of Science Tokyo Tokyo Japan Department of Civil & Infrastructure Engineering Disaster Preparedness Mitigation and Management School of Engineering and Technology Asian Institute of Technology (AIT) Pathumthani Thailand Environmental Engineering and Disaster Management Program Mahidol University Kanchanaburi Thailand

ISBN: (数字)9798331505400

ISBN: (纸本)9798331505417

This study compares the disaster management laws of Thailand and Japan. The research reveals significant differences in legislative approaches, reflecting each country's unique historical, and governance contexts. Japan's law demonstrates a more comprehensive approach to the disaster management cycle and stakeholder involvement, with integrated financial provisions. Thailand's law emphasizes organizational aspects. Both prioritize response measures but show potential gaps in addressing preparedness and mitigation phases. The study identifies areas for further investigation, including financial measures, and international cooperation approaches. This comparative analysis offers valuable insights into both countries' ongoing development of disaster management systems and highlights potential areas for mutual learning and improvement in disaster risk reduction strategies. Creating resilience in the society through the core of the government working and stakeholders' given authorities.

关键词： Phase measurement Law Prevention and mitigation Disasters Area measurement Legislation Frequency measurement Stakeholders Robots Resilience

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Anticancer drugs alter active nitrogen-cycling communities with effects on the nitrogen removal efficiency of a continuous-flow aerobic granular sludge system

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Chemosphere 2025年 376卷 144279页

作者： Castellano-Hinojosa, Antonio Gallardo-Altamirano, Manuel J. Santo Svierzoski, Nicoly Dal Pozo, Clementina González-López, Jesús González-Martínez, Alejandro Environmental Microbiology Group Institute of Water Research University of Granada Granada18003 Spain Department of Microbiology University of Granada Granada18071 Spain Civil Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro Brazil

There is increasing awareness of the presence of anticancer drugs (ACDs) in wastewater. Nonetheless, how ACDs affect the performance of wastewater treatment systems and their microbial populations remains largely unclear. This study investigated the effects of three common ACDs (cyclophosphamide, tamoxifen, and methotrexate) at varying concentrations on physicochemical parameters and drug removal efficiency in an aerobic granular sludge (AGS) system operated in a continuous-flow reactor. Additionally, it examined the abundance of active microbial communities, including nitrifiers (amoA gene from ammonia-oxidizing bacteria and archaea) and denitrifiers (napA, narG, nirK, nirS, nosZ genes), as well as the biodiversity of active prokaryotic communities. The concentration level of ACDs determines variations in biomass density, granule integrity, and removal efficiencies of organic matter (OM) and total nitrogen. Both medium and high ACD concentrations negatively impact these physicochemical parameters. The findings revealed that AGS functioning within a continuous system could help remove ACDs, but removal efficiencies depended on the specific drug and concentration applied. At medium and high ACD concentrations a marked reduction in the abundance of active bacterial and archaeal communities, including nitrifiers and denitrifiers, was observed, alongside a decline in microbial diversity and a transformation in community composition. Specific bacterial genera, which are crucial for OM degradation, nitrification and denitrification were identified as particularly sensitive to anticancer drugs. Our findings highlight the need for monitoring and managing anticancer drugs in wastewater systems, as they can substantially alter treatment performance, nitrogen-cycling communities, and bacterial community composition. © 2025 Elsevier Ltd

关键词： Cytotoxic Denitrification Granular Microbial abundance Nitrification Wastewater

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In situ regeneration of phenol-saturated activated carbon fiber via an electro-permanganate process

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Journal of Water Process engineering 2025年 72卷

作者： Liu, Zhen Liu, Lang Fu, Yiwei He, Huan Zhao, Chuanliang Duan, Xiaodi Ren, Bangxing Zhang, Zhe Yuan, Shaochun Chen, Yao Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission Chongqing Jiaotong University Chongqing 400074 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming 650500 China School of Civil Engineering Chang' an University Shaanxi Xi'an 710061 China Key Laboratory of Organic Compound Pollution Control Engineering (MOE) School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering (ChEE) University of Cincinnati Cincinnati 45221-0071 OH United States

The use of activated carbon (AC) for the adsorption of organic pollutants has proven to be an effective technology for treating industrial wastewater. However, existing electrochemical advanced oxidation technologies (E-AOT) employed for the regeneration of activated carbon exhibit certain limitations, including the reabsorption of intermediate substances and the degradation of the carbon structure. In this study, we employed electro-permanganate (E-PM) technology to regenerate phenol-saturated activated carbon fiber (ACF). Unlike the existing E-AOT regeneration system, such as those utilizing electro-peroxydisulfate and electro-persulfate, the Mn(III) and Mn(V) produced in the E-PM system induce the least structural damage on the ACF. In addition, during the E-PM process, the generation of hydroxyl radicals (•OH) at the anode poses a low risk of damage to the cathode structure due to mass transfer limitations. During the E-PM process, Mn(III), Mn(V), Mn(VI), and •OH interact with MnO₂, leading to secondary adsorption of intermediate products, which constitute approximately 4.32 % of the total adsorption. When compared to our previous research (regeneration efficiency of 75.69 %, phenol removal rate of 93.31 %), the efficiency of multiple regenerations using the E-PM system has markedly improved (regeneration efficiency of 91.22 %, phenol removal rate of 94.89 %). These findings indicate that the E-PM system offers a promising regeneration strategy for activated carbon, characterized by a 93.11 % reduction in energy consumption compared to electrochemical regeneration systems, a high regeneration efficiency, preservation of pore structure, and a minimized risk of secondary pollution. © 2025 Elsevier Ltd

关键词： Activated carbon Electro-permanganate Electrochemistry Regeneration

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Mechanisms of change in accelerated carbonation progress in cement paste under different relative humidity conditions

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Cement and Concrete Research 2025年 195卷

作者： Cheng, Luge Kurihara, Ryo Ohkubo, Takahiro Kitagaki, Ryoma Teramoto, Atsushi Suda, Yuya Maruyama, Ippei Department of Architecture of Engineering The University of Tokyo Tokyo113-8656 Japan Department of Applied Chemistry and Biotechnology of Engineering Chiba University Chiba263-8522 Japan Division of Human Environmental Systems of Engineering Hokkaido University Sapporo060-8628 Japan Department of Architecture of Advanced Science and Engineering Hiroshima University Hiroshima739-8527 Japan Civil Engineering Program Faculty of Engineering University of the Ryukyus Okinawa903-0213 Japan

This study investigated the evolution of water content and carbonation in OPC cement paste under low, intermediate, and high relative humidity (RH) conditions, emphasizing the role of water in accelerated carbonation and microstructural modifications. Under high RH, the carbonation suppressed after 28 days owing to calcium ion accumulation at the surface, precipitating as calcite. This calcite formation leads to a dense calcium carbonate layer, reducing the gas–liquid interfacial area for CO₂ dissolution and blocking further water evaporation and carbonation process. Low RH conditions cause the agglomeration of calcium silicate aluminate hydrate (C–(A)–S–H), increasing empty space in the microstructure. This facilitates CO₂ penetration but limits CH carbonation due to insufficient water availability. These findings highlight the significance of water distribution and microstructural evolution in CO₂ sequestration, revealing that RH critically influences the progress of carbonation by altering the pore structure and subsequent water availability in cementitious materials. © 2025 The Authors

关键词： Carbonation

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Health risk assessment of physicochemical and heavy metals exposures of the usage of shallow groundwater located at the proximity to Citarum River, Indonesia

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and environmental engineering 2025年 11卷

作者： Salami, Indah Rachmatiah Siti Thufailah, Nadya Aulia Fahimah, Nurul Roosmini, Dwina Environmental Management Technology Research Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jalan Ganesa no. 10 Bandung 40132 Indonesia Environmental Engineering Master Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jalan Ganesa no. 10 Bandung 40132 Indonesia Center for Environmental Studies Institut Teknologi Bandung Jalan Sangkuriang no. 42A Bandung Indonesia Research Center for Environmental and Clean Technology National Research and Innovation Agency Indonesian (BRIN) KST Samaun Samadikun Jl Sangkuriang No. 21 West Java Bandung 40135 Indonesia

Shallow groundwater is commonly used for daily needs in Indonesia, and the water quality is affected by surrounding land uses with anthropogenic activities. The study aimed to evaluate shallow groundwater quality and public health risks. 51 groundwater samples located <150 m from the river were collected from agriculture, industrial, and domestic areas along the Upper Citarum River, supporting millions of people's activities. Physicochemical, heavy metals and microbiological parameters were measured. Water quality was compared to the government standards, and the statistical correlation and Principal Component Analysis were used to analyze the potential sources. The health risk was estimated using the Hazard Quotient, Hazard Index, and Excess Cancer Risks approach. The results showed that some heavy metals contaminated shallow groundwater were the dominant source of health risk. Pb concentration has statistically inversely correlated with distance from the river. Non-carcinogenic risk of children is higher than that in adults, with the rank of agriculture > industrial > domestic regions, and only suitable for dermal exposure. Meanwhile, the carcinogenic risk is unacceptable for both dermal and oral intakes and risk in agriculture > industrial > domestic areas. Higher distance from the river shows decreasing risk values, and the estimated safe distance from the river follows the sequences of industrial > agriculture > domestic area affected by the hydrogeological condition and flooding prone in industrial areas. These findings underscore the potential impact on public health and the urgency of addressing this issue through pollution source prevention, buffer-safe distance management, and education for the public. © 2025 The Authors

关键词： Agricultural ECR Groundwater distance to river HI Industrial Land uses Residential areas Shallow wells

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Reuse of sludge from photo-Fenton process and further application as a catalyst in electrochemical processes for the treatment of landfill leachate

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Waste Management 2025年 202卷 114796页

作者： de Araujo Vidal, Iana Chaiene Cardozo, Jussara Câmara Barbosa Segundo, Inalmar Dantas dos Santos, Elisama Vieira Martínez-Huitle, Carlos Alberto Rodrigues Rocha, Elisângela Maria Postgraduate Program in Civil and Environmental Engineering Federal University of Paraiba University City Paraiba João Pessoa Brazil Renewable Energies and Environmental Sustainability Research Group Institute of Chemistry Federal University of Rio Grande do Norte Campus Universitário Rio Grande do Norte Natal Brazil SP São Paulo05508-020 Brazil

To evaluate the potential of sludge from solar photo-Fenton to be transformed into a catalyst for the heterogeneous electro-Fenton (EF) process, some parameters were investigated, including (i) the impact of heat treatment on catalytic activity through structural and compositional analysis of the iron species (100, 600 and 750 °C);(ii) analysis of the effect of pH and current density (j) on the decolorization and decarbonization efficiency;and (iii) the generation of high-value organic acids. The calcination of sludge to 600 and 750 °C presents changes in the multiferroic structures but does not enhance its catalytic activity, given the similarity of the treatment results of landfill leachate with the catalyst with and without calcination. The treatment of leachate via heterogeneous EF using sludge dried at 100 °C and under pH 3 achieves better results than the treatment without pH adjustment. At the evaluated j values (30, 60 and 90 mA/cm2), Chemical Oxygen Demand removal efficiencies of 47 %, 48 % and 50 % were respectively found, and Total Organic Carbon abatements of 36 %, 36 % and 42 % were reached. Despite the low effluent mineralization, high value-added products (carboxylic acids) are formed during 240 min of EF, with the possibility of selective electroconversion into acetic and formic acid. Regarding decolorization, a successful result was found with the j of 90 mA/cm2, which achieved almost 90 % color removal. Finally, a final treatment strategy is proposed using the sludge only dried to 100 °C, followed by heterogenous EF with acidification to pH 3 and j of 60 mA/cm2. © 2025 Elsevier Ltd

关键词： Leachate treatment

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