Browse
Subjects
Records with Subject: Environment
Showing records 1 to 25 of 3265. [First] Page: 1 2 3 4 5 Last
Enhancing the Photocatalytic Performance of BiVO4 for Micropollutant Degradation by Fe and Ag Photomodification
Marin Popović, Tayebeh Sharifi, Marijana Kraljić Roković, Boštjan Genorio, Boštjan Žener, Igor Peternel, Urška Lavrenčič Štangar, Hrvoje Kušić, Ana Lončarić Božić, Marin Kovačić
February 19, 2024 (v1)
Subject: Environment
Keywords: BiVO4, ciprofloxacin, design of experiments, iron, isotype homojunction, modification, photomodification, silver, vacancy
Wider application of BiVO4 (BVO) for photocatalytic water treatment is primarily limited by its modest photocatalytic effectiveness, despite its appropriately narrow band gap for low-cost, sunlight-facilitated water treatment processes. In this study, we have photomodified an isotype BVO, consisting of a tetragonal zircon and monoclinic scheelite phase, with Fe (Fe@BVO) and Ag (Ag@BVO) ionic precursors under UV illumination in an aqueous ethanol solution in order to assess their effect on the opto-electronic properties and effectiveness for the removal of ciprofloxacin (CIP). Fe@BVO failed to demonstrate enhanced effectiveness over pristine BVO, whereas all Ag@BVO achieved improved CIP degradation, especially 1% Ag@BVO. At pH 4 and 6, 1% Ag@BVO demonstrated nearly 24% greater removal of CIP than BVO alone. Photomodification with Fe created surface oxygen vacancies, as confirmed by XPS and Mott−Schottky analysis, which facilitated improved electron mobility, although no distinct Fe-cont... [more]
Study on Mechanism and Regularity of Rock Breaking by Pulsed Water Injection with Particles
Tian Zhao, Qingxiang Wu, Haifeng Lv, Heng Song, Xinke Yang, Tiancheng Fang
February 10, 2024 (v1)
Subject: Environment
Keywords: hard formation, particles, pulse, rock breaking, rock drilling, water injection
In recent years, the drilling technology applied to deep and ultra-deep formations has developed rapidly, but the drilling speed for hard formations is low. Therefore, it is very important to study the drilling methods for deep and hard strata. Particle pulsed jet drilling is a new drilling method based on particle jet impact drilling technology and high-pressure pulsed water jet impact drilling technology. In this paper, the mathematical models of the shear layer amplification coefficient and wave velocity are established based on a similar network theory, and the motion equations of a single particle and particle swarm are established according to the motion of particles in a pulsed jet environment. Then, based on the self-designed particle jet impact rock-breaking experimental platform, the numerical simulation results are compared, analyzed, and verified. The results show that the rock-breaking efficiency increases with the increase in the average velocity of the particle pulsed je... [more]
Fouling Mitigation in Membrane Distillation Using Pulsation Flow Technique
Hani Abulkhair, Iqbal Ahmed Moujdin, Bashar Kaddoura, Muhammad Saad Khan
February 10, 2024 (v1)
Subject: Environment
Keywords: fouling, membrane distillation, mitigation, pulsation flow, wastewater treatment
The main obstacles to scaling up membrane distillation (MD) on a commercial level are membrane fouling and temperature polarization. Therefore, in this study, the significance of the pulsation feed flow phenomenon was used for membrane distillation (DCMD) polarization, and comparisons were made using steady-state feed flow. Two different Hertz and amplitudes of pulsation feed flow trends were used in DCMD using different sources of water, including distilled water, seawater, and wastewater. Compared to steady-state feed flow, the results revealed that flux was enhanced for seawater once the operating flow became turbulent, and it enhanced even more once the flow rate was increased and the turbulence flow was moved. For wastewater, pulsation in the feed flow had an impact on delaying the beginning of the flux decline point and enhancing the overall freshwater recovery. In both pulsation feed flows (1 and 2 Hertz), the results also revealed a deficiency in fouling and an improvement in t... [more]
Treatment Wetland with Thalia geniculata for Wastewater Depuration in the Department of Sucre, Colombia
Vicente Vergara-Flórez, Jorge Mieles-Galindo, Graciela Nani, Mayerlin Sandoval-Herazo, Luis Carlos Sandoval Herazo
February 10, 2024 (v1)
Subject: Environment
Keywords: hydraulic retention time, macrophytes, removal efficiency, sewage water, treatment wetland
Municipal and industrial wastewater discharge is a longstanding environmental problem that pollutes water bodies, affecting both the landscape and human health. In the department of Sucre, Colombia, nearby urban sewage is discharged into the Arroyo Grande de la Sabana, and only Sincelejo city has a treatment system in place. Therefore, it is critical to identify effective treatment methods for removing contaminants from water. The objective of this study was to evaluate the efficiency of a constructed wetland (CW) with horizontal subsurface flow (HSSF) planted with Thalia geniculata for treating wastewater from the Arroyo Grande de la Sabana in Sucre, Colombia. The study investigated the effectiveness of a constructed wetland planted with Thalia geniculata for treating wastewater from the Arroyo Grande de la Sabana in Sucre, Colombia. Two different hydraulic retention times (HRTs) of 3 and 5 days were tested, and the plant population density was analyzed to determine the better adaptat... [more]
Water-Energy-Environment Nexus Analysis Tools: Case Study for Canary Islands
David Borge-Diez, Francisco José García-Moya, Enrique Rosales-Asensio
February 10, 2024 (v1)
Subject: Environment
Keywords: analysis tool, greenhouse gases, Renewable and Sustainable Energy, sustainable development goals, Water-Energy-Environment nexus
Despite that previous research exists, there is a need for further research on the quantitative aspects of this Nexus. Existing Water-Energy-Environment Nexus management tools and frameworks are based on indicators aiming to model the whole system, analyze the involved resources, and test potential management strategies. The environmental, social, and economic consequences of actions already taken and ongoing projects require important focus because of the strong relationship between water and energy supply, and that both are key issues for society’s development and sustainability. The present research focuses on the indicators that the Water-Energy-Environment Nexus tools and frameworks use to analyze the whole problem. Existing tools often require large amounts of data, becoming a time-consuming process that lowers the capacity to evaluate the political problems of high pollutants. With the aim of accelerating time evaluation, this research builds an indicator to rapidly evaluate the... [more]
Iron and Hydrogen Peroxidation-Induced Post-Treatment Improvement of Municipal Mesophilic Digestate in an Alkaline Environment and Its Impact on Biosolids Quality
Umme Sharmeen Hyder, Ahmed AlSayed, Elsayed Elbeshbishy, Joseph McPhee, Reshmi Misir
February 10, 2024 (v1)
Subject: Environment
Keywords: biosolids post-treatment, biosolids quality analysis, centrate phosphorous removal, ferric chloride, hydrogen peroxide, mesophilic digestate
Challenges associated with mesophilic digestate (MD) involve volume, odor, and pathogens, which effective post-digestion treatments can address. The efficiency of MD post-treatment can be enhanced by conditioning with ferric chloride (FeCl3), hydrogen peroxide (H2O2), and polymer. This study aimed to observe the effect of combined chemical conditioning on volume reduction, phosphorus (P) release, odor, and pathogen reduction potential for MD. MD was conditioned with polymer only, polymer and FeCl3 at pH adjusted to 8.0 with lime (Ca(OH)2), and a blend of polymer, FeCl3, and hydrogen peroxide (H2O2) at pH 8.0. The results show that adding all three chemicals improved post-treatment efficiency at 2.1 kg/t DS FeCl3, 2.1 kg/t DS polymer, and 600 mg/L H2O2 at pH 8.0, compared with polymer or dual conditioning. At the combined dose, cake solid content, centrate P removal, and odor reduction capability improved compared with raw MD by 20%, 99%, and 66%, respectively. Combined chemical treatme... [more]
Research on a Carbon Emission Prediction Method for Oil Field Transfer Stations Based on an Improved Genetic Algorithm—The Decision Tree Algorithm
Qinglin Cheng, Xue Wang, Shuang Wang, Yanting Li, Hegao Liu, Zhidong Li, Wei Sun
February 10, 2024 (v1)
Subject: Environment
Keywords: “dual carbon”, carbon emission forecasting, energy saving and emissions reduction, IGA-decision tree algorithm, transfer station system
The background of “dual carbon” is accelerating low-carbon transformation in the energy field, and oil field enterprises are facing challenges in energy conservation and emissions reduction for sustainable development. However, oil field gathering and transfer station systems, which are crucial components of the onshore transportation system, face challenges in energy conservation and emissions reduction. Therefore, it is necessary to predict the carbon emissions of oil field gathering and transfer station systems. To improve the accuracy of carbon emission prediction for the system, this study proposes an improved GA-decision tree (IGA-decision tree) algorithm. First, chaotic mapping was introduced to initialize the population, ensuring a uniform distribution of initial particles in the search space and enhancing population diversity. Second, the firefly perturbation strategy was employed to avoid the problem of genetic algorithms becoming trapped in local optima during the later stag... [more]
Enabling Safe and Sustainable Hydrogen Mobility: Circular Economy-Driven Management of Hydrogen Vehicle Safety
Mohammad Yazdi, Rosita Moradi, Reza Ghasemi Pirbalouti, Esmaeil Zarei, He Li
February 10, 2024 (v1)
Subject: Environment
Keywords: adaptive DEMATEL, decision-making, fuel cell electric vehicles (FCEVs), hydrogen vehicle safety, net-zero emissions, sustainable development goals
Hydrogen vehicles, encompassing fuel cell electric vehicles (FCEVs), are pivotal within the UK’s energy landscape as it pursues the goal of net-zero emissions by 2050. By markedly diminishing dependence on fossil fuels, FCEVs, including hydrogen vehicles, wield substantial influence in shaping the circular economy (CE). Their impact extends to optimizing resource utilization, enabling zero-emission mobility, facilitating the integration of renewable energy sources, supplying adaptable energy storage solutions, and interconnecting diverse sectors. The widespread adoption of hydrogen vehicles accelerates the UK’s transformative journey towards a sustainable CE. However, to fully harness the benefits of this transition, a robust investigation and implementation of safety measures concerning hydrogen vehicle (HV) use are indispensable. Therefore, this study takes a holistic approach, integrating quantitative risk assessment (QRA) and an adaptive decision-making trial and evaluation laborat... [more]
Quantitative Analysis of Soil Cd Content Based on the Fusion of Vis-NIR and XRF Spectral Data in the Impacted Area of a Metallurgical Slag Site in Gejiu, Yunnan
Zhenlong Zhang, Zhe Wang, Ying Luo, Jiaqian Zhang, Xiyang Feng, Qiuping Zeng, Duan Tian, Chao Li, Yongde Zhang, Yuping Wang, Shu Chen, Li Chen
February 10, 2024 (v1)
Subject: Environment
Keywords: competitive adaptive reweighted sampling, soil Cd pollution, spectral fusion, visible-near infrared, X-ray fluorescence
Vis-NIR and XRF spectroscopy are widely used in monitoring heavy metals in soil due to their advantages of being fast, non-destructive, cost-effective, and non-polluting. However, when used individually, XRF and vis-NIR may not meet the accuracy requirements for Cd determination. In this study, we focused on the impact area of a non-ferrous metal smelting slag site in Gejiu City, Yunnan Province, fused the pre-selected vis-NIR and XRF spectra using the Pearson correlation coefficient (PCC), and identified the characteristic spectra using the competitive adaptive reweighted sampling (CARS) method. Based on this, a quantitative model for soil Cd concentration was established using partial least squares regression (PLSR). The results showed that among the four fusion spectral quantitative models constructed, the model combining vis-NIR spectral second-order derivative transformation and XRF spectral first-order derivative transformation (D2(vis-NIR) + D1(XRF)) had the highest coefficient... [more]
Artificial Intelligence and Carbon Emissions in Manufacturing Firms: The Moderating Role of Green Innovation
Yixuan Chen, Shanyue Jin
February 10, 2024 (v1)
Subject: Environment
Keywords: Artificial Intelligence, carbon emissions, green management innovation, green product innovation, green technology innovation
Carbon emissions have gained worldwide attention in the industrial era. As a key carbon-emitting industry, achieving net-zero carbon emissions in the manufacturing sector is vital to mitigating the negative effects of climate change and achieving sustainable development. The rise of intelligent technologies has driven industrial structural transformations that may help achieve carbon reduction. Artificial intelligence (AI) technology is an important part of digitalization, providing new technological tools and directions for the low carbon development of enterprises. This study selects Chinese A-share listed companies in the manufacturing industry from 2012 to 2021 as the research objects and uses a fixed-effects regression model to study the relationship between AI and carbon emissions. This study clarifies the significance of enterprise AI technology applications in realizing carbon emissions reduction and explores the regulatory mechanism from the perspective of the innovation effec... [more]
An Experimental Investigation on the Shear-Seepage Coupling Failure Behavior of Split Grouting-Reinforced Body
Yaolei Zhang, Haitong Sui, Lei Yang, Rongfeng Lin
February 10, 2024 (v1)
Subject: Environment
Keywords: confining pressure, failure mechanism, seepage pressure, soil–slurry interface, split grouting-reinforced body
A split grouting-reinforced body (SGRB) is the new surrounding rock that forms after split grouting reinforcement in tunnels and underground engineering, and its shear-seepage behavior is one of the critical factors affecting tunnel stability. The effects of seepage pressure, confining pressure, and the roughness of the soil−slurry interface on the shear-seepage characteristics of SGRB specimens were investigated using a modified triaxial shear-seepage coupling test system. The failure mechanism for the SGRB was analyzed taking into account its seepage behavior and mechanical characteristics. The results showed that the seepage process of the SGRB specimens could be divided into four stages according to the seepage velocity, including the waterless, rapid, decelerating, and steady seepage stages, and the corresponding water turbidity in the seepage stages was classified as turbid, mildly turbid, or clear, respectively. The peak shear stress of the soil−slurry interface of the SGRB spec... [more]
Acetylcellulose Recovery from Waste Residual for Attenuating Reactive Dye from Aquaculture Waste as a Fascinating Synergistic Ecology Effect
Hossam A. Nabwey, Maha A. Tony, Manasik M. Nour
February 10, 2024 (v1)
Subject: Environment
Keywords: acetylcellulose waste, Adsorption, isotherm models, levafix dye, wastewater treatment
Waste valorization is attracting not only the scientific world but also the world. Acetylcellulose wastes from cigarette filter residuals are signified as the largest global impact of solid waste. Acetylcellulose recycling for desired products is a promising way for environmental management. In this regard, the current investigation is dealing with the immersion of residual filters sequentially into aqueous solutions of alkali and ethanol before water washing, which converts them into a superhydrophobic acetylcellulose adsorbent material. The morphology and characteristics of the acetylcellulose fiber were characterized using a Scanning Electron Microscope (SEM) and Fourier-Transform infrared spectroscopy (FTIR). The adsorption tendency was checked for Levafix Blue dye compromised in an aqueous stream as a model textile polluted effluent. The experimental results exposed that the acetylcellulose fiber displayed a sensible textile dye elimination from the dying stream. Langmuir isotherm... [more]
Can subsea shuttles be a cost-competitive solution for CO2 transport?
Simon Roussanaly, Sigmund Holm, Avinash Subramanian
February 1, 2024 (v1)
Subject: Environment
Keywords: Carbon Capture and Storage, CO2 transport, Offshore storage, subsea shuttle, Technoeconomic Analysis
Considering the role that offshore CO2 storage is expected to play in deploying carbon capture and storage, enabling cost-efficient and flexible solutions for transporting CO2 to relevant storage locations. While several pipeline and ship-based approaches have been proposed to do so, subsea shuttles are a new concept that has also been proposed in the past couple of years. The present study seeks to understand if this new approach could be cost-efficient compared to current and upcoming ship-based transport concepts.
The result shows that the shuttle concept could be cost-competitive to currently mature 15 barg-based shipping, especially if the subsea shuttle connects to a CO2 pipeline infrastructure rather than to the reservoir directly, although cost-competitiveness is achieved only for a limited range of volumes and distances. However, it is unlikely that this concept would be cost-attractive compared to the upcoming 7 barg-based shipping, and sensitivity analyses highlight that th... [more]
An Experimental Study on Temperature, Relative Humidity, and Concentrations of CO and CO2 during Different Cooking Procedures
Xi Chen, Yahui Gao, Liu Yang, Yang Liu, Miaomiao Qin, Jialing Xia, Peng Wang
January 12, 2024 (v1)
Subject: Environment
Keywords: CO concentration, CO2 concentration, cooking procedure, relative humidity, temperature
In order to explore the indoor air quality during different cooking procedures, a very common kitchen in China is selected for experimental research. An indoor air quality meter is used to measure the temperature, relative humidity, and CO and CO2 concentrations of the indoor air above the stove when people cook four different dishes under different ventilation patterns in the kitchen. The results indicate that the heat and gas consumed during cooking are closely related to the temperature and concentrations of CO and CO2. Some cooking procedures such as boiling water are related to the indoor air temperature and relative humidity in the kitchen. In addition, in kitchens without mechanical ventilation, natural ventilation shows a more significant positive effect on controlling temperature, relative humidity, and concentrations of CO and CO2 during cooking procedures.
Transitioning towards Net-Zero Emissions in Chemical and Process Industries: A Holistic Perspective
Peter Glavič, Zorka Novak Pintarič, Helena Levičnik, Vesna Dragojlović, Miloš Bogataj
January 12, 2024 (v1)
Subject: Environment
Keywords: Biomass, cement, chemicals, climate, emissions, Energy, metals, net zero, process industries, waste
Given the urgency to combat climate change and ensure environmental sustainability, this review examines the transition to net-zero emissions in chemical and process industries. It addresses the core areas of carbon emissions reduction, efficient energy use, and sustainable practices. What is new, however, is that it focuses on cutting-edge technologies such as biomass utilization, biotechnology applications, and waste management strategies that are key drivers of this transition. In particular, the study addresses the unique challenges faced by industries such as cement manufacturing and highlights the need for innovative solutions to effectively reduce their carbon footprint. In particular, the role of hydrogen as a clean fuel is at the heart of revolutionizing the chemical and process sectors, pointing the way to cleaner and greener operations. In addition, the manuscript explores the immense importance of the European Green Deal and the Sustainable Development Goals (SDGs) for the... [more]
Investigation of the Adsorption Process of Triclosan from an Aqueous Solution, Using Nanoporous Carbon Adsorbents, Obtained after Treatment of Organic Household and Vegetable Waste
Ivanka Stoycheva, Bilyana Petrova, Boyko Tsyntsarski, Pavlina Dolashka, Angelina Kosateva, Nartzislav Petrov
January 12, 2024 (v1)
Subject: Environment
Keywords: Adsorption, environmental protection, nanoporous carbon adsorbents, organic waste, triclosan
The absorption of triclosan on the surface of four different carbon adsorbents, obtained on the base of plant and household waste (RDF), provided by Sofia Waste Plant, was investigated. The obtained results indicate that the most important parameters, which determine the process of triclosan adsorption by adsorbent surface are pore texture, the size of the accessible surface for the molecules of triclosan, and the chemical nature of the adsorbent surface. It was found that the obtained adsorbents can be successfully applied for the extraction of triclosan from waste and drinking water. The possibilities for solid products, obtained by thermal treatment of household and vegetable waste, to be applied successfully in a water purification technique are discussed.
Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin
Enze Wang, Yang Li, Tonglou Guo, Liang Xiong, Xiaoxia Dong, Tong Wang, Kaibo Shi
January 12, 2024 (v1)
Subject: Environment
Keywords: Dongyuemiao member, lacustrine shale, organic matter accumulation mechanism, sedimentary environment
Lacustrine shale has garnered significant attention due to its significant resource potential. The Jurassic shale in the Sichuan Basin is an important target for lacustrine shale exploration in China. However, previous studies have predominantly focused on the Da’anzhai member of the Ziliujing Formation, and little attention has been paid to the shale of other strata. This paper aims to address this gap by investigating the Jurassic Dongyuemiao member in the Sichuan Basin. The study systematically characterizes the geological properties of the Dongyuemiao shale system, reconstructs the paleosedimentary environment, identifies the key factors influencing organic matter (OM) enrichment and physical properties, and assesses its resource potential through comparative analysis. Our results show that the Dongyuemiao shale was deposited in an oxic and semi-humid sedimentary environment characterized by intense weathering conditions. The enrichment of OM in the shale is primarily controlled by... [more]
Performance of Regenerated Activated Carbons on Pesticides Removal from the Aqueous Phase
Isabel Pestana da Paixão Cansado, Paulo Alexandre Mira Mourão, José Eduardo dos Santos Félix Castanheiro
January 5, 2024 (v1)
Subject: Environment
Keywords: activated carbon regeneration, circular economy, pesticide removal, reuse
Adsorbents presenting high adsorption capacity, fast adsorption rate, easy regeneration, and a good possibility for reusability are ideal for removing 4-chloro-2-methyl-phenoxyacetic acid (MCPA) or other pesticides from wastewater. Here, the effects of regeneration treatments on adsorption−desorption cycles are examined using two commercial activated carbons (ACs) (Merck and Norit 1240 X). MCPA adsorption was fast on Merck and Norit ACs in powder form (6 h) but on Norit AC, in granular form, adsorption was too slow, and the equilibrium time was reached only after 288 h. MCPA adsorption kinetic data were analyzed by applying pseudo-first-order, pseudo-second-order, and Weber−Morris models. The pseudo-second-order model fit better to all data, and the Weber−Morris representation allows confirming that on Norit 1240 X, in granular form, the pore diffusion was the limiting factor concerning the MCPA adsorption. Merck and Norit 1240 X (in powder and granular form) ACs loaded with MCPA were... [more]
Paleo-Sedimentary Environments and Controlling Factors for Enrichment of Organic Matter in Alkaline Lake Sediments: A Case Study of the Lower Permian Fengcheng Formation in Well F7 at the Western Slope of Mahu Sag, Junggar Basin
Gangqiang Chen, Yuantao Tang, Yuhang Nan, Fan Yang, Dongyong Wang
January 5, 2024 (v1)
Subject: Environment
Keywords: depositional environment, Fengcheng formation, Junggar Basin, major elements, organic matter enrichment, trace elements
The Lower Permian Fengcheng formation is a significant source of rocks and a reservoir for the Mahu Sag in the Junggar Basin. Recently, the paleo-environment deposition factors of the P1f formation have become a popular research topic. This research was conducted using data from the F7 well of Mahu Sag, based on the geochemical analysis results of TOC (total organic carbon), REE (rare earth elements), and major and trace elements of 53 samples from P1f (Lower Permian Fengcheng formation), and some deposition factors are discussed. The P1f deposition process was classified into four stages based on paleo-environment elemental indicators. This research describes the deposition process of the evolution of alkaline lakes. The early and preliminary stages of alkali lake evolution are considered as late P1f1 to middle P1f2; the paleoclimate of this process was dry, the reduction conditions increased, and the paleo-productivity and lake salinity were enhanced. The terminal stage of alkali lak... [more]
A Hybrid Ultrasonic Membrane Anaerobic System (UMAS) Development for Palm Oil Mill Effluent (POME) Treatment
Nour Hamid Abdurahman, Yunus Mohd Rosli, Nour Hamid Azhari, Gasim Hayder, Ismail Norasyikin
January 5, 2024 (v1)
Subject: Environment
Keywords: anaerobic, COD removal, kinetics equations, membrane, POME, ultrasonic
The high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) levels in palm oil mill effluent (POME) wastewater make it an environmental contaminant. Moreover, conventional POME wastewater treatment approaches pose economic and environmental risks. The present study employed an ultrasonic membrane anaerobic system (UMAS) to treat POME. Resultantly, six steady states were procured when a kinetic assessment involving 11,800−21,700 mg·L−1 of mixed liquor suspended solids (MLSS) and 9800−16,800 mg·L−1 of mixed liquor volatile suspended solids (MLVSS) was conducted. The POME treatment kinetics were explained with kinetic equations derived by Monod, Contois and Chen and Hashimoto for organic at loading rates within the 1−11 kg·COD·m−3·d−1 range. The UMAS proposed successfully removed 96.6−98.4% COD with a 7.5 day hydraulic retention time. The Y value was 0.67 g·VSS/g·COD, while the specific micro-organism decay rate, b was 0.24 day−1. Methane (CH4) gas production ranged from 0.2... [more]
Fenton: A Systematic Review of Its Application in Wastewater Treatment
Matheus Pimentel Prates, Suzana Maria de Oliveira Loures Marcionílio, Karine Borges Machado, Danyelle Medeiros de Araújo, Carlos A. Martínez-Huitle, Arizeu Luiz Leão Arantes, José Eduardo Ferreira da Silva Gadêlha
January 5, 2024 (v1)
Subject: Environment
Keywords: advanced oxidative processes, pollution, scientometrics, Wastewater
The use of new technologies for the removal of pollutants from wastewater has become globally necessary due to the complexity and facilities defined by conventional treatments. Advanced oxidative processes, specifically the Fenton process, have become widely applied given their low cost and ease of use. Therefore, this study aimed to evaluate the progression of the scientific publications on the implementation of Fenton process, investigating their space−time evolution. Additionally, useful solutions, trends, and gaps in the applications for the removal of pollutants with this methodology were identified, and also different remediation strategies and the design of new treatments for wastewaters were identified within this scientometric analysis. Bibliometric research was conducted in two scientific databases, Web of Science and Scopus, from 2011 to 2022, and we identified 932 and 1263 studies with the word “Fenton,” respectively. When these publications are associated with the treatmen... [more]
Improving the Process of Product Design in a Phase of Life Cycle Assessment (LCA)
Andrzej Pacana, Dominika Siwiec, Lucia Bednárová, Ján Petrovský
November 30, 2023 (v1)
Subject: Environment
Keywords: design, impact on environment, LCA, life cycle assessment, photovoltaic panel, product, production engineering, quality, relative state scale, weighted sum model
The early phases of product development effect fundamental changes in products throughout their life cycle. Therefore, the objective of the investigation was to develop a simplified model that supports the process of product design simultaneously in terms of qualitative and environmental factors. The model is dedicated to the design phase in the life cycle assessment of the product (LCA). The originality of the model consists in: (i) analysis of customers’ satisfaction from qualitative alternatives of products; (ii) assessments of the environmental impact of these alternatives; (iii) definition of the importance of qualitative and environmental attributes of products; and (iv) prediction of favourable changes in products according to qualitative−environmental levels. The model was tested for photovoltaic panels (PVs). The model is mainly dedicated to small and medium-sized enterprises (SMEs) for support in making decisions in the design phases of products in their life cycles.
A Volume Fracturing Percolation Model for Tight Reservoir Vertical Wells
Dianfa Du, Peng Liu, Lichuan Ren, Yuan Li, Yujie Tang, Fanghui Hao
November 30, 2023 (v1)
Subject: Environment
Keywords: Laplace transform, nonlinear seepage, productivity, volume fracturing vertical well
Based on the non-linear seepage characteristics of tight reservoirs and the reconstruction mode of vertical wells with actual volume fracturing, a seven-area percolation model for volume fracturing vertical wells in tight reservoirs is established. Laplace transform and Pedrosa transform are applied to obtain analytical solutions of bottom hole pressure and vertical well production under a constant production regime. After verifying the correctness of the model, the influence of the fracture network parameters on the pressure and production is studied. The research results indicate that as the permeability modulus increases, the production of volume fracturing vertical wells decreases. The penetration ratio of the main crack and the half-length of the main crack have a small impact on production, while the diversion capacity of the main crack has a significant impact on the initial production, but it is ultimately limited by the effective volume of the transformation. Under constant pr... [more]
A Modelling-Based Framework for Carbon Emissions Calculation in Additive Manufacturing: A Stereolithography Case Study
Vasiliki C. Panagiotopoulou, Aikaterini Paraskevopoulou, Panagiotis Stavropoulos
November 30, 2023 (v1)
Subject: Environment
Keywords: additive manufacturing, carbon calculation framework, carbon emissions, carbon footprint, holistic framework, stereolithography
Manufacturing is one of the most heavily contributing sectors to global warming via its high carbon emissions. Initiatives such as the Green Deal and Sustainable Goals by the United Nations are supporting the reduction of carbon emissions in the manufacturing sector, which can be completed by making manufacturing processes more sustainable and with less carbon footprint. This also applies to novel manufacturing processes such as additive manufacturing (AM). In this work, a previously developed framework for carbon footprint calculation was tailor-made and applied to a specific stereolithography (SLA) case. The different steps of the SLA were categorised per process, machine tool and system level, and the respective carbon emissions were calculated, either theoretically or via a life cycle assessment software. The carbon emissions at the process level were significant when compared to the total carbon emissions, and the carbon emissions of the isopropanol (IPA) bath accounted for more t... [more]
Review on Waste-to-Energy Approaches toward a Circular Economy in Developed and Developing Countries
Shahabaldin Rezania, Bahareh Oryani, Vahid Reza Nasrollahi, Negisa Darajeh, Majid Lotfi Ghahroud, Kamyar Mehranzamir
November 30, 2023 (v1)
Subject: Environment
Keywords: circular economy, developed and developing countries, policies and regulations, solid waste management, waste-to-energy
International interest in using waste-to-energy (WtE) technology toward a circular economy (CE) is developing, spurred by environmental challenges such as inefficient solid waste dumping, pollution, and resource depletion. Incineration, pyrolysis, gasification, landfill, and anaerobic digestion are standard WtE technologies. Although these methods have been used for many decades, all countries try to implement the best plans based on their technologies and capacities. Therefore, an up-to-date comprehensive study is needed to evaluate the existing barriers to draw a logical roadmap for WtE to CE. Therefore, this review addresses the recent policies adopted by developed and developing countries for WtE technologies. Based on the findings, most countries seek the most cost-effective and environmentally sustainable pathways in WtE to CE; meanwhile, international collaboration and governmental support are needed to overcome the existing barriers and find a sustainable and economically viabl... [more]
Showing records 1 to 25 of 3265. [First] Page: 1 2 3 4 5 Last
[Show All Subjects]