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Charif, Omar. "Modelling and simulating individual's mobility : case study of Luxembourg and its greater region". Electronic Thesis or Diss., Compiègne, 2013. http://www.theses.fr/2013COMP2130.
Pełny tekst źródłaIn the last century, transport and in particular the use of private cars has emerged as a major source of CO2 emissions (second behinf energy production). Several cities in the world have put in place strategies to deal with this problem and to reduce its adverse enviromental impacts. Some strategies could not achieve their objectives, and had negative reactions from individuals. The ail of this PhD thesis is to propose a methodology and a platform for modelling and simulating people mobility systems. The developed plat form is, then, used to implement land use and transportation scenarios and strategies in a virtual world to study their impact on human behavior in terms of mobility. To develop this platform, we propose a hybrid model, combining cellular automata and multi-agent systems, capable of handling the complexity of the mobility system able to present it at various spatial ans temporal scales
Charif, Omar. "Modelling and simulating individual's mobility : case study of Luxembourg and its greater region". Thesis, Compiègne, 2013. http://www.theses.fr/2013COMP2130.
Pełny tekst źródłaIn the last century, transport and in particular the use of private cars has emerged as a major source of CO2 emissions (second behinf energy production). Several cities in the world have put in place strategies to deal with this problem and to reduce its adverse enviromental impacts. Some strategies could not achieve their objectives, and had negative reactions from individuals. The ail of this PhD thesis is to propose a methodology and a platform for modelling and simulating people mobility systems. The developed plat form is, then, used to implement land use and transportation scenarios and strategies in a virtual world to study their impact on human behavior in terms of mobility. To develop this platform, we propose a hybrid model, combining cellular automata and multi-agent systems, capable of handling the complexity of the mobility system able to present it at various spatial ans temporal scales
Sarry, Frédéric. "Contribution à la caractérisation de capteurs à base d'oxyde d'étain : application à l'analyse d'une atmosphère gazeuse conditionnée". Metz, 1998. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1998/Sarry.Frederic.SMZ9846.pdf.
Pełny tekst źródłaDue 10 to environmental problems, there is a great effort on gas sensor research and development which may give qualitative and quantitative analysis. Our goal is to study a particular atmosphere composed of forane R134a, a refrigerant gas, and carbon dioxide in dry synthetic air. We have chose to use Figaro type gas sensor based on a tin dioxide sensitive layer because of the large number of detectable gases, their easy use, their large commercialisation and their low cost. These sensors are merged in an array so as to reduce their lack of selectivity and their drift effect. The first part of this study is dedicated to the choice of the experimental set-up and protocol and the characterization of three types of TGS sensors under pure gases or mixtures. This has confirmed the antagonist effects of the two studied gases and has shown two principal criteria : the steady-state conductance and the slope of the conductance. Ln a second part, experimental data are analysed with pattern recognition method as PCA or DFA. This confirm the choice of the. Two criteria, show the similarity of sensors of the same type and determine the gas nature. It is so possible to discriminate the gases in our conditionned atmosphere with an array of three different type gas and a discriminant function analysis
Kang, Seung-Jin. "L'analyse des effets économiques de politiques d'environnement par un modèle d'équilibre général appliqué : le cas de la Corée du Sud". Grenoble 2, 1999. http://www.theses.fr/1999GRE21025.
Pełny tekst źródłaChen, Yushu. "Application de l'équation PC-SAFT à la capture du dioxyde de carbone et à la désulfuration des essences". Electronic Thesis or Diss., Université de Lorraine, 2013. http://www.theses.fr/2013LORR0092.
Pełny tekst źródłaThe replacement of conventional organic solvents by a new generation of solvents less toxic, less flammable and less polluting is a major challenge for the chemical industry. Ionic liquids have been widely promoted as interesting substitutes for traditional solvents. The purpose of this work is to evaluate the behavior of ionic liquids in the presence of greenhouse gases (CO2, CH4 and N2O) or organic compounds. Firstly, a theoretical study presents the performance of the thermodynamic model PC-SAFT in the representation of vapor-liquid equilibrium of systems containing ionic liquids and carbon dioxide. Then, the solubility study of methane, carbon dioxide and nitrous oxide in various ionic liquids was performed at high or low pressure. The group contribution concept is proposed in this study in order to predict the Henry's law constant of carbon dioxide in ionic liquids. Finally, a study on the vapor-liquid equilibrium of binary systems encountered in gasoline desulfurization was carried out. Experimental data were used to evaluate the performance of PC-SAFT equation of state to represent phase equilibrium of systems {sulfur / aromatic compounds + ionic liquid}
Benali, Omar. "Étude des intéractions entre un catalyseur solide et son environnement réactionnel : Cas de l'oxydation du propène sur oxydes de cuivre". Nancy 1, 1987. http://www.theses.fr/1987NAN10271.
Pełny tekst źródłaShen, Zhiyang. "Essays on Green Productivity". Electronic Thesis or Diss., Lille 1, 2016. http://www.theses.fr/2016LIL12004.
Pełny tekst źródłaAs economic development and population growth, human’s production activity lays a heavy burden on the natural environment. In order to maintain sustainable development, investigating the relationship between economic development and environmental impact has received much attention. This thesis takes into account undesirable factors in production technology and tries to integrate the negative externality of carbon emissions into the measurement of economic performance, referred to as green productivity. This thesis employs a nonparametric estimation approach with directional distance function to analyze environmental efficiency, total factor productivity, and carbon shadow prices among different developed and developing countries at the macro level. We propose new contributions to the measurement and decomposition of productivity indices which capture environmental efficiency. Based on empirical results, we discuss the current environmental regulations and economic policies among countries, to provide useful information for decision and policy makers from an economic point of view
Camara, Mamoudou. "Croissance économique et impact environnemental : le découplage est-il possible ?" Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL12004/document.
Pełny tekst źródłaUsing both theoretical and empirical approaches, this thesis aims to bring a new light on the link between economic growth and environment. It is divided into two parts. The first part focuses on a reconsideration of the decoupling question. The study of the evolution of the environmental problematic in economic theory, in the first chapter, shows that this debate is not new, and has not remained static. Then, in the second chapter, after to have shown the complexity (particularly its multidimensionality and the limits of approaches to measure the decoupling) of the decoupling concept, our study with a new empirical approach on several countries seems to show the evidence of decoupling in the case of certain countries. The second part consists to explain the decoupling. The third chapter which is focused on analysis of the main decoupling determinants, allowed us to identify three determinants (the development level, the structure of the economy and the socioeconomic relationship to the environment), and also to show that their impact on the decoupling is limited in the time. The last chapter, which is an extension of the third chapter, focuses on analysis of the decoupling factors in a “regulationniste” perspective. With this approach, our thesis has tried to show the importance of the degree of ecological concerns and the quality of institutions in a country to achieve decoupling. Thus, through these four chapters, this thesis seems to show that the possibilities to achieve decoupling are tributary of several factors, and also that decoupling, even in the case of CO2, is sometimes possible, but not permanently
Tran, Thi Thanh Xuan. "Essays on trade, growth and the environment". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1G005/document.
Pełny tekst źródłaThe aim of this thesis is to measure the impact of international trade on growth and carbon dioxide emissions using a sample covering 83-104 countries over the period 1971-2010. The empirical analysis of the income and growth equation in the first chapter shows that the trade-growth relationship differs across regions. Especially in Africa, a continent characterized by a small network trade. The second chapter develops the results and examines the network analysis by taking into account the topological characteristic of a country in world network trade. The results show that the impact of trade on growth depends on the country's commercial network and that this impact increases with the extension of the network. In a second part, we analyze the directly and indirectly channels through which trade openness affect the environment. The analysis in the third chapter shows that the effect of trade on emissions of pollutants differs between developed and developing countries. The last chapter focuses on the effects of trade on pollutant emissions through trade specialization. According to the estimation results, for high-income countries, the effect of trade is greater if they specialize in capital-intensive sectors and decreases with an increase in per capita income. For middle- and low-income countries, trade has a positive effect on pollutant emissions, this effect is impeded if they specialize in labor-intensive industries and increase with an increase in per capita income
Cardinaud, Guillemette. "Liants ternaires à base d'argile calcinée : Etude des mécanismes de structuration, optimisation mécanique et durabilité". Electronic Thesis or Diss., Ecole centrale de Nantes, 2021. http://www.theses.fr/2021ECDN0018.
Pełny tekst źródłaThe reduction of carbon dioxide emissions related to cement production is a key point for industry today. About 60% of these emissions are chemical and issued from a crucial step in cement production: clinkerization. One of the solutions to reduce carbon dioxide emissions associated with concrete is the substitution of clinker by other materials. Since some decades, scientific community is particularly interested to the use of calcined clays (and specifically metakaolin) as supplementary cementitious materials (SCM). The combination of such materials with limestone filler is very promising in terms of mechanical properties. This study aims at demonstrate that the results obtained with a clay composed of illite and kaolinite before calcination are equivalent to those observed with a clay containing only kaolinite. Through a multi-scale approach, this work shows that the use of a pure clay is not necessary. In the case of ternary binders, hydrate assemblage is similar with one or the other clay. Performance-based approach is adopted for the qualification of durability indicators for concrete containing such binders and carbonation of these concretes must be given attention. Results in this study are encouraging and promising for the industrial use of composite calcined clays in cements
Jagu, Schippers Emma. "Addressing climate change with carbon dioxide removal : Insights from industrial economics and cooperative games". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST134.
Pełny tekst źródłaRemoving CO2 from the atmosphere in addition to rapid mitigation efforts appear inevitable to keep global warming below 2°C. A growing number of countries and companies are setting “net zero” greenhouse gas emissions objectives in the coming decades, which implies that residual CO2 emissions would be compensated for by Carbon Dioxide Removal (CDR). CDR methods enhance natural carbon sinks or chemically engineer CO2 out of the atmosphere for durable storage through, for example, afforestation, Bioenergy with Carbon Capture and Storage (BECCS), or Direct Air Carbon Capture and Storage (DACCS). Although some methods are already well-established and technically feasible, CDR faces a slow uptake. With few exceptions to date, large-scale projects have not been commercially deployed. The identification of the socio-economic barriers currently hindering the deployment of CDR is thus a fundamental and timely research challenge. In particular, the barriers related to strategic interactions and coordination issues within value chains are often overlooked, despite being critical to unlocking a large-scale deployment of CDR.This thesis examines two specific coordination issues: (i) the deployment of shared CO2 transportation infrastructures, which are essential for the upscaling of BECCS processes, and (ii) the formation of interregional coalitions to reduce the overall costs of CDR. In both cases, cooperation can only succeed if a mutually acceptable and fair distribution of the costs and benefits can be achieved. Cooperative game-theory is thus particularly well-suited to examine such gain-sharing problems. The application of cooperative game-theory to a Swedish case-study of CO2 infrastructure deployment reveals that an incentive-compatible sharing of infrastructure costs is possible, provided that a sufficiently high CO2 price is reached. However, BECCS projects may be locked out from pipeline construction projects because of their current lack of economic incentives compared to fossil-fueled CCS projects. The risk of lock-out has important policy implications, as forward-looking infrastructure planning appears necessary to ensure the inclusion of BECCS in CO2 infrastructure. Finally, this thesis argues that inter-regional cooperation is instrumental in affordably deploying CDR and provides guiding principles on fair gain-sharing to ensure inter-regional agreements can materialize
Diaw, Amadou. "Pour une socio-anthropologie des risques littoraux : vulnérabilités socio-écologiques et action collective sur le littoral normand". Caen, 2015. http://www.theses.fr/2015CAEN1023.
Pełny tekst źródłaIn this doctoral thesis, we developed a socio-anthropological approach to socio-environmental risks and vulnerabilities on the Normandy coast by focusing on collective action. From an empirical approach on the analysis of projects managed by the Conservatoire du Littoral and local actors, we analyzed the links between hydrosystem and sociosystem on coastal territories. The analytical framework has integrated the context of global change as a social framework to better understand the issues raised by climate change and the dynamics of the coastline on the relevant sites. The analysis of the interrelations between individuals, groups and the society on the one hand, and the relationships between different socio-ecological risk and vulnerabilities on the other hand, was carried out in a socio-anthropological approach that sought to understand the "functional relationship" between the social context and knowledge. Thus, it was necessary to focus on both the social system and on the social structures mobilized by actors as framework for their actions. Therefore, the social framework tends to structure knowledge as well. Thus, collective action can be comprehended as social action based on an emerging social system, as a process being more or less controlled by an authority, which purpose is to act or to produce an effect. Moreover, collective actions are dynamics based on knowledge production and which incorporate several political, economic and socio-ecological variables and dimensions
Nascimento, Lucelma Aparecida. "Stockage du carbone dans les sols et dynamique des paysages en Amazonie : l’exemple du Nord-Ouest de l’État de Mato Grosso – Brésil dans le cadre du REDD (Réduction des Émissions par Déforestation et Dégradation)". Thesis, Rennes 2, 2015. http://www.theses.fr/2015REN20028/document.
Pełny tekst źródłaThe land use changes altered the carbon storage potential in the soil. The deforestation and agricultural techniques have a significant impact on the global carbon cycle and contribute to greenhouse gases. The main objective of this thesis is to highlight the links between carbon storage, land use and the dynamics. For this study, we used satellite images over the period 1987 – 2011, to classify types of land occupations. In fact, not only to determine the amount of carbon in the soil, but also to check the connection between the amount of carbon and land management in different properties. Farms operate in the northwestern part of the state of Mato Grosso were chosen for their different operating modes: the Fazenda São Nicolau, in the Cotriguaçu community, where a reforestation policy was designed, the Fazenda Preciosa (representing the traditional agricultural model) and the Assentamento Vale do Amanhecer (recent deployment system based on the division of land among smallholders, with each having an operating strategy) in the of Juruena community. Therefore, detailed studies were developed through a regional soil mapping at scale 1: 100,000 in association with relief, hydrographic network, the geological substratum, climate changes, the vegetation and soils, and following the methodology and the techniques based on established organizational charts for these jobs. All this, in addition to mapping data about the physical partitions of these areas by remote sensing. Thus were carried out some analysis: the physical and chemical analysis, of the fluorescence spectrometry X-rays, the diffraction of X-rays, the geochemical environments - statistical analyzes as well as calculate the densities of the sampled soils in a geochemical context for Determination of the elements are associated with the carbon and organic matter. Studies on land use were also conducted. The Results show a range of carbon stock values between 0.01 and 8.89 kg / m2 distributed among diverse class of soil and selected for placement. Mappings of carbon stock classes allowed confront them with the land and the textural classes. The best correlations between carbon storage classes and certain types of high forest and carbon stock between the classes and the clayey textures were possible to find out that were found. Thus no way to land use seems to have a radical impact on carbon stocks; the cultural and historical practices of each farm better explain the results. This physicochemical approach primarily aimed at identifying the regions studied the soil types in their compositions that have higher levels of organic matter and nutrients where carbon storage is more assured. The results that were obtained in this research, lead us to propose a new model of studies to put into practice new ideas about REDD, as well as the organization's data of carbon storage in these different areas studied, which can be applied in other regions and objective interpretations that will of course be obtained in this body of work
Mourier, Wilfried. "Configurations structurelles et options d’extensions des systèmes de permis d’émissions négociables". Electronic Thesis or Diss., Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAE002.
Pełny tekst źródłaMost countries recognize that a coordinated worldwide action to limit greenhouse gas (GHG) emissions has to be implemented. However, the countries inability to coordinate their efforts led to the failure of the top-down climate architecture. Today, the international climate governance adopts a different direction, which based on bottom-up approach. This approach promotes polycentric and multi-level governances, that induce several independent policy-makers in different administrative scales (province, state and region). Therefore, the actual implemented Emission Trading Systems (ETS), as well as the emerging ones, grow in a domestic context. This context, in terms of economic development, political commitment and geographical coverage, determine the ETS design. Then, there is no harmonized design among ETS, no universal diffusion of these mechanisms in the world and a lack of integral inclusion of all sectors in these carbon markets. While researchers and policy-makers discuss the optimal features of such systems, this thesis examines different configuration options and coverage areas for the tradable permit schemes.Using a world energy-economy partial equilibrium simulation model (POLES) and drawing on experiences with real-world ETSs (based on empirical literature), we recommend two types of adjustments: the restrictions on trade permits between sectors, in one hand, and the control of international permit exchange between ETS, in the second hand. Indeed, we demonstrate firstly the necessity to separate ETS by sector and adapt them considering the specificities of each sector. This kind of policy will stimulate innovation in each sector. Also, it will limit the impacts on the international competitiveness and it will lead climate policy to other economic policies. Secondly, we develop a model to describe the effects of exchange permits emissions considering international linking among emissions trading systems. We prove that restriction exchange mechanisms are necessary to insure the redistribution of exchange gain compared to full linking. At the same time, these trade restriction mechanisms minimize the total cost and increase GHG emissions reductions compared to a segmented market.Considering the diversity of national political objectives and the bottom-up context of world climate framework, we concluded that the coexistence of several carbon prices is unavoidable and necessary. Encouraging the development of several carbon prices can promote political acceptability, strengthen environmental efficiency and improve economic efficiency
Anselmi, Hélène. "Modélisation et évaluation environnementale d’une unité de captage de CO₂ intégrée à un procédé industriel". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0080.
Pełny tekst źródłaLimiting carbon dioxide (CO2) emissions is a major global issue, particularly for the energy, chemical and metallurgical industries. To this end, CO2 capture technologies have been developed in recent decades. In this study, we focused on three types of CO2 capture technologies: chemical absorption by MEA, membrane separation and activated carbon adsorption. The CO2 considered is emitted by a coal-fired power station and then directly valorized within a manufacturing process on the same site. The objective of this study was to quantify the environmental benefits of installing a CO2 capture technology in comparison to the current configuration, without CO2 capture. Our approach combined process modeling and life cycle assessment. The methodology adopted was to model the complete system (the power plant, the manufacturing process and the various capture units) using a flowsheeting software (Aspen Plus), then to determine the environmental impacts by LCA. The results show that the MEA chemical adsorption process is strongly penalized by the use of the solvent, both regarding the energy consumption and the environmental impacts. The membrane process exhibits significant environmental impacts, despite a much lower energy consumption, due to the massive use of polymers (membrane materials). Finally, the activated carbon adsorption process has lower environmental impacts than the other two processes in the vast majority of impact categories
Lagier-Jaegler, Anicia. "Evaluation des impacts simultanes de la localisation, de l'efficacite et du type de produits fabriques sur les performances environnementales et financieres d'une chaine logistique". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00844739.
Pełny tekst źródłaPincebourde, Sylvain. "Biophysique environnementale des insectes endophytes". Phd thesis, Université François Rabelais - Tours, 2005. http://tel.archives-ouvertes.fr/tel-00108243.
Pełny tekst źródłaDes mesures de spectrométrie optique ont démontré que la larve modifie profondément les propriétés optiques de la surface de la feuille au cours de son nourrissage. La structure mine absorbe bien plus de radiations dans le proche infrarouge que les tissus foliaires intacts. De plus, une quantité importante de radiations est transmise à l'intérieur de la mine par le tégument supérieur dans les zones prélevées par la larve. Ces radiations induisent une élévation importante de son activité respiratoire (rejet de CO2). En utilisant un analyseur de gaz par infrarouge, nous avons pu montrer par ailleurs que les stomates localisés dans le tégument inférieur de la mine réagissent à la présence de la larve en se fermant. Un modèle de diffusion de CO2 a révélé que les stomates réagissent directement aux variations d'émission de CO2 par la larve. Le budget thermique de la mine a ensuite été modélisé. Le modèle permet de prédire la température à l'intérieur de la mine à partir des modifications des propriétés optiques et de la physiologie des stomates, et à partir des variables climatiques. Ce modèle biophysique a été validé en comparant ses prédictions avec des mesures expérimentales de température de mines réalisées en environnement contrôlé. Le modèle à une précision de 0,8 °C dans l'intervalle de 12 °C à 42 °C. Le modèle prédit un important excès de température dans la mine, atteignant 10 °C au dessus de la température de l'air et 5 °C au dessus de la température des tissus foliaires intacts. Les deux types de modifications – propriétés optiques et comportement stomatiques – ont un impact équivalent sur l'excès de température. Cette approche démontre clairement que la larve contrôle son environnement physique en modifiant son environnement. Nos résultats sont finalement discutés dans une perspective d'écologie évolutive. Plus particulièrement, le rôle du microclimat des insectes endophages dans l'évolution de leurs sensibilités thermiques et de celles de leurs parasitoïdes est détaillé.
Cadel, Maëlys. "Relations entre production agricole, services écosystémiques et impacts liés au fonctionnement du sol : Quels effets de systèmes de culture plus autonomes en azote en contexte de changement climatique ?" Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1076.
Pełny tekst źródłaAgricultural soils provide many ecosystem services (ES) to farmers and Society such as green and blue water provision, nutrient provision to crops, water quality regulation, carbon sequestration etc. However, most cropping systems are still intensively managed, based on chemical inputs, with little to no consideration of the possible effects of such practices on the environment and the ability of soils to provide these ES. One issue of agroecological transition is to design more sustainable production systems, with limited use of chemical inputs, that provide and benefit from biodiversity and the ES support of agricultural production. We thus need to improve our knowledge on the spatio-temporal relationships that may exist between management practices, agricultural production, ES and environmental impacts. This manuscript synthesizes the results of a three years INRAE-ANDRA collaboration that aimed at providing key information on soil-crop functioning while facing this challenge. This work was structured into two parts. We first conducted a systematic literature review of the relationships between agricultural production, the ES and the impacts linked to soil functioning, within temperate annual production systems. In order to be able to compare the results of the 40 studies selected, we developed a new ontology of soil-based ES and impacts. This review evidenced mainly non-significant relationships between Biomass production and the ES and impacts investigated suggesting that there is no systematic trade-off between agricultural production and regulating ES. We also identified key relationships that have never been investigated in the studies selected as those between C sequestration and Physical soil quality regulation or Soil biodiversity. Also, an analysis of the effects of drivers of these ES revealed that the three pillars of conservation agriculture, as well as organic fertilization, seem promising practices to provide balanced bundles of ES. We then performed simulation analyses of actual and agroecological cropping systems of the French long-term Environmental Observatory of ANDRA. The objectives were to assess the effects of more N self-sufficient cropping systems, with a climate change mitigation purpose, on the temporal relationships between agricultural production, 5 ES and 3 impacts linked to soil functioning. These cropping systems were designed by implementing three agroecological management practices: a) long cover crops with legume (crimson clover), b) grain legumes (pea) and c) fodder legumes (alfalfa). To assess the performances of these systems, we used the STICS model, that simulates the functioning of the soil-crop system at a daily time-step. Simulations were run over two 20-years time periods: a first one for recent past climate (2000-2021) and a second one for future climate projection using RCP 8.5 (2036-2057). If most of the temporal relationships analysed were non-significant, results highlighted that the use of long cover crops in the rotation provided the highest values of N provision to crops and C sequestration and the lowest values of NO3 lixiviation
Anselmi, Hélène. "Modélisation et évaluation environnementale d’une unité de captage de CO₂ intégrée à un procédé industriel". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0080.
Pełny tekst źródłaLimiting carbon dioxide (CO2) emissions is a major global issue, particularly for the energy, chemical and metallurgical industries. To this end, CO2 capture technologies have been developed in recent decades. In this study, we focused on three types of CO2 capture technologies: chemical absorption by MEA, membrane separation and activated carbon adsorption. The CO2 considered is emitted by a coal-fired power station and then directly valorized within a manufacturing process on the same site. The objective of this study was to quantify the environmental benefits of installing a CO2 capture technology in comparison to the current configuration, without CO2 capture. Our approach combined process modeling and life cycle assessment. The methodology adopted was to model the complete system (the power plant, the manufacturing process and the various capture units) using a flowsheeting software (Aspen Plus), then to determine the environmental impacts by LCA. The results show that the MEA chemical adsorption process is strongly penalized by the use of the solvent, both regarding the energy consumption and the environmental impacts. The membrane process exhibits significant environmental impacts, despite a much lower energy consumption, due to the massive use of polymers (membrane materials). Finally, the activated carbon adsorption process has lower environmental impacts than the other two processes in the vast majority of impact categories