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Roger Samsó
Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Campus de Bellaterra UAB, Edifici C, 08193 Barcelona, Spain

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Journal article
Published: 11 February 2021 in Sustainability
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In the present study, we compare energy transition scenarios from a new set of integrated assessment models, the suite of MEDEAS models, based on a systems dynamic modeling approach, with scenarios from two already well know structurally and conceptually different integrated assessment models, the Integrated MARKAL-EFOM System (TIMES) and the Long-Range Energy Alternatives Planning system (LEAP). The investigation was carried out to cross-compare and benchmark the response of MEDEAS models with TIMES and LEAP in depicting the energy transition in two different countries, Austria and Bulgaria. The preliminary results show a good agreement across all the models in representing scenarios projecting historical trends, while a major discrepancy is detectable when the rate of implementation of renewable energy is forced to increase to achieve energy system decarbonization. The discrepancy is mainly traceable to the differences in the models’ conception and structures rather than in a real mismatch in representing the same scenarios. The present study is put forward as a guideline for validating new modeling approaches that link energy policy decision tools to the global biophysical and socioeconomic constraints.

ACS Style

Ilaria Perissi; Gianluca Martelloni; Ugo Bardi; Davide Natalini; Aled Jones; Angel Nikolaev; Lukas Eggler; Martin Baumann; Roger Samsó; Jordi Solé. Cross-Validation of the MEDEAS Energy-Economy- Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-Range Energy Alternatives Planning System (LEAP). Sustainability 2021, 13, 1967 .

AMA Style

Ilaria Perissi, Gianluca Martelloni, Ugo Bardi, Davide Natalini, Aled Jones, Angel Nikolaev, Lukas Eggler, Martin Baumann, Roger Samsó, Jordi Solé. Cross-Validation of the MEDEAS Energy-Economy- Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-Range Energy Alternatives Planning System (LEAP). Sustainability. 2021; 13 (4):1967.

Chicago/Turabian Style

Ilaria Perissi; Gianluca Martelloni; Ugo Bardi; Davide Natalini; Aled Jones; Angel Nikolaev; Lukas Eggler; Martin Baumann; Roger Samsó; Jordi Solé. 2021. "Cross-Validation of the MEDEAS Energy-Economy- Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-Range Energy Alternatives Planning System (LEAP)." Sustainability 13, no. 4: 1967.

Preprint
Published: 13 January 2021
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In the present study, we compare energy transition scenarios from a new set of Integrated Assessment Models, the suite of MEDEAS models, based on a systems dynamic modelling approach, with scenarios from two already well know structurally and conceptually different Integrated Assessment Models, the Integrated MARKAL-EFOM System (TIMES) and the Long-range Energy Alternatives Planning system (LEAP). The investigation was carried out to cross-compare and benchmark the response of MEDEAS models with TIMES and LEAP in depicting the energy transition in two different countries, Austria and Bulgaria. The preliminary results show a good agreement across all the models in representing scenarios projecting historical trends, while a major discrepancy is detectable when the rate of implementation of renewable energy is forced to increase to achieve energy system decarbonization. The discrepancy is mainly traceable to the differences in the models’ conception and structures rather than in a real mismatch in representing the same scenarios. The present study is put forward as a guideline for validating new modelling approaches that link energy policy decision tools to the global biophysical and socioeconomic constraints.

ACS Style

Ilaria Perissi; Gianluca Martelloni; Ugo Bardi; Davide Natalini; Aled Jones; Angel Nikolaev; Lukas Eggler; Martin Baumann; Roger Samsó; Jordi Solé. Cross-Validation of the MEDEAS Energy-Economy-Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-range Energy Alternatives Planning system (LEAP). 2021, 1 .

AMA Style

Ilaria Perissi, Gianluca Martelloni, Ugo Bardi, Davide Natalini, Aled Jones, Angel Nikolaev, Lukas Eggler, Martin Baumann, Roger Samsó, Jordi Solé. Cross-Validation of the MEDEAS Energy-Economy-Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-range Energy Alternatives Planning system (LEAP). . 2021; ():1.

Chicago/Turabian Style

Ilaria Perissi; Gianluca Martelloni; Ugo Bardi; Davide Natalini; Aled Jones; Angel Nikolaev; Lukas Eggler; Martin Baumann; Roger Samsó; Jordi Solé. 2021. "Cross-Validation of the MEDEAS Energy-Economy-Environment Model with the Integrated MARKAL-EFOM System (TIMES) and the Long-range Energy Alternatives Planning system (LEAP)." , no. : 1.

Journal article
Published: 23 June 2020 in Sustainability
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Europe must move towards a 100% renewable transportation system for climate, energy and sustainability reasons. We estimate the capital and energy required for building and operating a renewable transportation system providing similar services as the EU-28 transport system of 2016. It could be based on: biogas or fuel cell vessels; liquid biogas powered aircrafts; electric railways and fuel cell or electric vehicles between major cities; and car sharing, electric buses and electric two- and three-wheelers, for short journeys. A system of charging posts on the streets and roads for passenger and commercial e-vehicles is studied. Alternatively, a Tracked Electric Vehicle system of continuous power on European roads would improve energy efficiency and the saving of scarce metals (Ni, Li), at a lower cost, if only national roads were electrified. The investment for the construction of the whole system would be 2.3–2.7% of the EU’s GDP per year for 30 years. The new system operation would require 16% less energy than that of 2016, with reduction of 70% in road transport. However, shipping and aviation would demand 162% and 149% more energy, respectively, if liquefied biogas were used as fuel. A type of land transport fully based on trains would provide a similar service to that of an electric vehicle fleet, with a 29% lower energy consumption.

ACS Style

Antonio García-Olivares; Jordi Solé; Roger Samsó; Joaquim Ballabrera-Poy. Sustainable European Transport System in a 100% Renewable Economy. Sustainability 2020, 12, 5091 .

AMA Style

Antonio García-Olivares, Jordi Solé, Roger Samsó, Joaquim Ballabrera-Poy. Sustainable European Transport System in a 100% Renewable Economy. Sustainability. 2020; 12 (12):5091.

Chicago/Turabian Style

Antonio García-Olivares; Jordi Solé; Roger Samsó; Joaquim Ballabrera-Poy. 2020. "Sustainable European Transport System in a 100% Renewable Economy." Sustainability 12, no. 12: 5091.

Journal article
Published: 25 September 2017 in Science of The Total Environment
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The average organic and hydraulic loads that Constructed Wetlands (CWs) receive are key parameters for their adequate long-term functioning. However, over their lifespan they will inevitably be subject to either episodic or sustained overloadings. Despite that the consequences of sustained overloading are well known (e.g., clogging), the threshold of overloads that these systems can tolerate is difficult to determine. Moreover, the mechanisms that might sustain the buffering capacity (i.e., the reduction of peaks in nutrient load) during overloads are not well understood. The aim of this work is to evaluate the effect of sudden but sustained organic and hydraulic overloads on the general functioning of CWs. To that end, the mathematical model BIO_PORE was used to simulate five different scenarios, based on the features and operation conditions of a pilot CW system: a control simulation representing the average loads; 2 simulations representing +10% and +30% sustained organic overloads; one simulation representing a sustained +30% hydraulic overload; and one simulation with sustained organic and hydraulic overloads of +15% each. Different model outputs (e.g., total bacterial biomass and its spatial distribution, effluent concentrations) were compared among different simulations to evaluate the effects of such operation changes. Results reveal that overloads determine a temporary decrease in removal efficiency before microbial biomass adapts to the new conditions and COD removal efficiency is recovered. Increasing organic overloads cause stronger temporary decreases in COD removal efficiency compared to increasing hydraulic loads. The pace at which clogging develops increases by 10% for each 10% increase on the organic load.

ACS Style

F. Boano; Anacleto Rizzo; Roger Samsó; J. García; R. Revelli; L. Ridolfi. Changes in bacteria composition and efficiency of constructed wetlands under sustained overloads: A modeling experiment. Science of The Total Environment 2017, 612, 1480 -1487.

AMA Style

F. Boano, Anacleto Rizzo, Roger Samsó, J. García, R. Revelli, L. Ridolfi. Changes in bacteria composition and efficiency of constructed wetlands under sustained overloads: A modeling experiment. Science of The Total Environment. 2017; 612 ():1480-1487.

Chicago/Turabian Style

F. Boano; Anacleto Rizzo; Roger Samsó; J. García; R. Revelli; L. Ridolfi. 2017. "Changes in bacteria composition and efficiency of constructed wetlands under sustained overloads: A modeling experiment." Science of The Total Environment 612, no. : 1480-1487.

Conference paper
Published: 05 May 2017 in Proceedings of EECE 2020
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Mathematical models for the sludge line of a full-scale WWTP were developed with the aim of being integrated in a whole-plant model. A model describing the primary clarifier was also included. Reconciled data from plant routine sampling over a 2-year period together with data from dedicated campaigns were used to develop and calibrate the models. Different empirical correlations were identified to describe solids removal in primary settler, primary and activated sludge thickening, dewatering and drying, avoiding the assumption of constant removal efficiency. Analyses showed that characteristic particulate ratios (CODP/TSS, Porg/TSS, Norg/TSS, VSS/TSS) remain constant during thickening, dewatering and drying processes. Therefore, in the implemented model these ratios were used for predicting concentrations of particulate compound in the process outputs. Mass balances of COD, N and P were completed by assuming that concentrations of soluble compounds are conserved. An extended version of ADM1 was implemented to simulate the full-scale digester fed with primary and activated sludge. A complete influent characterisation including Biochemical methane potential (BMP) tests was performed to provide an ADM1 compatible substrate fractionation Additionally, energy models for each unit process were determined through regression analyses to fit energy consumption with operating parameters. An energy audit of the plant was conducted to assess the energy consumption of each process. Electric energy, the consumed biogas as well as other energy sources were considered in the analyses. Single models were assembled to build the sludge line model that will be used to obtain reliable predictions for reject water composition, biogas production, dry sludge and energy consumption.

ACS Style

G. Baquerizo; Roger Samsó; J. Fiat; J.-P. Canler; Sylvie Gillot. Developing Process Models to Accurately Assess Global and Energy Performances of a WWTP Sludge Line: A Case Study in France. Proceedings of EECE 2020 2017, 4, 607 -613.

AMA Style

G. Baquerizo, Roger Samsó, J. Fiat, J.-P. Canler, Sylvie Gillot. Developing Process Models to Accurately Assess Global and Energy Performances of a WWTP Sludge Line: A Case Study in France. Proceedings of EECE 2020. 2017; 4 ():607-613.

Chicago/Turabian Style

G. Baquerizo; Roger Samsó; J. Fiat; J.-P. Canler; Sylvie Gillot. 2017. "Developing Process Models to Accurately Assess Global and Energy Performances of a WWTP Sludge Line: A Case Study in France." Proceedings of EECE 2020 4, no. : 607-613.

Journal article
Published: 01 April 2017 in Science of The Total Environment
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Constructed wetlands are currently recognized as an effective environmental biotechnology for wastewater treatment, but the influence of their design parameters on internal functioning and contaminant removal efficiency is still under discussion. In this work, the effect of aspect ratio and water depth on bacteria communities as well as treatment efficiency of horizontal subsurface flow constructed wetlands (HSSF) under the Mediterranean climate was evaluated, using a mathematical model. For this purpose, experimental results from four pilot-scale wetlands of equal surface area but different aspect ratios and water depth were used. The HSSF system was fed with municipal wastewater. The experimental data were simulated using the BIO_PORE model, developed in the COMSOL Multiphysics™ platform. Simulations with the BIO_PORE model fitted well to the experimental results, showing a higher removal efficiency for the shallower HSSF for COD (93.7% removal efficiency) and ammonia nitrogen (73.8%). The aspect ratio had a weak relationship with the bacteria distribution and the removal efficiency. In contrast, the water depth was a factor. The results of the present study confirm a previous hypothesis in which depth has an important impact on the biochemical reactions causing contaminants transformation and degradation.

ACS Style

David Sanchez-Ramos; Núria Agulló; Roger Samsó; Joan García. Effect of key design parameters on bacteria community and effluent pollutant concentrations in constructed wetlands using mathematical models. Science of The Total Environment 2017, 584-585, 374 -380.

AMA Style

David Sanchez-Ramos, Núria Agulló, Roger Samsó, Joan García. Effect of key design parameters on bacteria community and effluent pollutant concentrations in constructed wetlands using mathematical models. Science of The Total Environment. 2017; 584-585 ():374-380.

Chicago/Turabian Style

David Sanchez-Ramos; Núria Agulló; Roger Samsó; Joan García. 2017. "Effect of key design parameters on bacteria community and effluent pollutant concentrations in constructed wetlands using mathematical models." Science of The Total Environment 584-585, no. : 374-380.

Journal article
Published: 01 April 2016 in Algal Research
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Highlights•Morris's method: procedure and sensitivity measurements•Application of Morris's method to the microalgae growth model•The maximum specific growth rate of microalgae is the most sensitive parameter. AbstractIn this paper, sensitivity analysis is applied to a mechanistic model developed to simulate microalgae growth. The Morris method of Elementary Effects (EEs) is applied to evaluate the sensitivity of model outputs with respect to a subset of key input parameters. For an easier interpretation, results were plotted as distributions of elementary effects means and standard deviations for each input parameter. The model outputs were very sensitive with respect to the maximum specific growth rate of microalgae (μalg). Results of the sensitivity analysis indicate that the transfer of ammonia (Ka,NH3) and carbon dioxide (Ka,CO2) have a non-linear relation with nitrogen uptake and carbonate concentrations, respectively. This analysis helped identify the parameters with the greatest impact on simulation outputs. The results indicated that maximum specific growth rate of microalgae (μalg) was the most critical parameter to calibrate properly. Graphical abstract

ACS Style

Alessandro Solimeno; Roger Samsó; Joan García. Parameter sensitivity analysis of a mechanistic model to simulate microalgae growth. Algal Research 2016, 15, 217 -223.

AMA Style

Alessandro Solimeno, Roger Samsó, Joan García. Parameter sensitivity analysis of a mechanistic model to simulate microalgae growth. Algal Research. 2016; 15 ():217-223.

Chicago/Turabian Style

Alessandro Solimeno; Roger Samsó; Joan García. 2016. "Parameter sensitivity analysis of a mechanistic model to simulate microalgae growth." Algal Research 15, no. : 217-223.

Journal article
Published: 01 January 2016 in Journal of Environmental Management
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Horizontal subsurface Flow Constructed Wetlands (HF CWs) are biofilters planted with aquatic macrophytes within which wastewater is treated mostly through contact with bacterial biofilms. The high concentrations of organic carbon and nutrients being transported leads to high bacterial biomass production, which decreases the flow capacity of the porous material (bioclogging). In severe bioclogging scenarios, overland flow may take place, reducing overall treatment performance. In this work we developed a mathematical model using COMSOL Multiphysics™ and MATLAB(®) to simulate bioclogging effects in HF CWs. Variably saturated subsurface flow and overland flow were described using the Richards equation. To simplify the inherent complexity of the processes involved in bioclogging development, only one bacterial group was considered, and its growth was described using a Monod equation. Bioclogging effects on the hydrodynamics were taken into account by using a conceptual model that affects the value of Mualem's unsaturated relative permeability. Simulation results with and without bioclogging were compared to showcase the impact of this process on the overall functioning of CWs. The two scenarios rendered visually different bacteria distributions, flow and transport patterns, showing the necessity of including bioclogging effects on CWs models. This work represents one of the few studies available on bioclogging in variably saturated conditions, and the presented model allows simulating the interaction between overland and subsurface flow occurring in most HF CWs. Hence, this work gets us a step closer to being able to describe CWs functioning in an integrated way using mathematical models.

ACS Style

Roger Samsó; Joan García; Pascal Molle; Nicolas Forquet. Modelling bioclogging in variably saturated porous media and the interactions between surface/subsurface flows: Application to Constructed Wetlands. Journal of Environmental Management 2016, 165, 271 -279.

AMA Style

Roger Samsó, Joan García, Pascal Molle, Nicolas Forquet. Modelling bioclogging in variably saturated porous media and the interactions between surface/subsurface flows: Application to Constructed Wetlands. Journal of Environmental Management. 2016; 165 ():271-279.

Chicago/Turabian Style

Roger Samsó; Joan García; Pascal Molle; Nicolas Forquet. 2016. "Modelling bioclogging in variably saturated porous media and the interactions between surface/subsurface flows: Application to Constructed Wetlands." Journal of Environmental Management 165, no. : 271-279.

Journal article
Published: 01 November 2015 in Algal Research
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The prospect of treating wastewater and at the same time producing microalgae biomass is receiving increasing attention. Mechanistic models for microalgae growth in wastewater are currently being developed for new systems design as well as to improve the understanding of the involved biokinetic processes. However, mathematical models able to describe the complexity of microalgal cultures are still not a common practice. The aim of the present study is to present and calibrate a new mechanistic model built in COMSOL Multiphysics™ platform for the description of microalgae growth. Carbon-limited algal growth, transfer of gases to the atmosphere; and photorespiration, photosynthesis kinetics and photoinhibition are included. The model considers the growth of microalgae as a function of light intensity and temperature, as well as availability of nitrogen and other nutrients. The model was calibrated using experimental data from a case study based on the cultivation of microalgae species in synthetic culture medium. The model was able to reproduce experimental data. Simulation results show the potential of the model to predict microalgae growth and production, nutrient uptake, and the influence of temperature, light intensity and pH on biokinetic processes of microalgae.

ACS Style

Alessandro Solimeno; Roger Samsó; Enrica Uggetti; Bruno Sialve; Jean-Philippe Steyer; Adrián Gabarró; Joan García. New mechanistic model to simulate microalgae growth. Algal Research 2015, 12, 350 -358.

AMA Style

Alessandro Solimeno, Roger Samsó, Enrica Uggetti, Bruno Sialve, Jean-Philippe Steyer, Adrián Gabarró, Joan García. New mechanistic model to simulate microalgae growth. Algal Research. 2015; 12 ():350-358.

Chicago/Turabian Style

Alessandro Solimeno; Roger Samsó; Enrica Uggetti; Bruno Sialve; Jean-Philippe Steyer; Adrián Gabarró; Joan García. 2015. "New mechanistic model to simulate microalgae growth." Algal Research 12, no. : 350-358.

Journal article
Published: 01 July 2015 in Ecological Engineering
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Constructed wetlands are a widely adopted technology for the treatment of wastewater in small communities. The understanding of their internal functioning has increased at an unprecedented pace over recent years, in part thanks to the use of mathematical models. BIO_PORE model is one of the most recent models developed for constructed wetlands. This model was built in the COMSOL Multiphysics (TM) software and implements the biokinetic expressions of Constructed Wetlands Model 1 (CWM1) to describe the fate and transport of organic matter, nitrogen and sulphur in horizontal subsurface-flow constructed wetlands. In previous studies, CWM1 was extended with the inclusion of two empirical parameters (M-bio_max and M-cap) that proved to be essential to provide realistic bacteria growth rates and dynamics. The aim of the current work was to determine the effect of these two parameters on the effluent pollutant concentrations predicted by the model. To that end, nine simulations, each with a different M-bio_max-M-cap pair, were launched on a high-end multi-processor computer and the effluent COD and ammonia nitrogen concentrations obtained on each simulation were qualitatively compared among them. Prior to this study, a finite element mesh optimization procedure was carried out to reduce computational cost. Results of the mesh optimization procedure indicated that among the 5 tested meshes of different element size, the mesh utilized for this model in previous studies represented a fair compromise between output accuracy and computation time. Results of the sensitivity analysis showed that the value of M-cap has a dramatic effect on the simulated effluent concentrations of COD and ammonia nitrogen, which clearly decreased for increasing values of this parameter. On the other hand, the model output was also sensitive to the values of M-bio_max, but its effects were less important and no clear relation could be established between its value and the simulated effluent concentration of COD and ammonia nitrogen. (C) 2014 Elsevier B.V. All rights reserved.Postprint (author’s final draft

ACS Style

Roger Samsó; Jordi Blázquez; Núria Agulló; Joan Boada Grau; Ricardo Da S Torres; Joan García. Effect of bacteria density and accumulated inert solids on the effluent pollutant concentrations predicted by the constructed wetlands model BIO_PORE. Ecological Engineering 2015, 80, 172 -180.

AMA Style

Roger Samsó, Jordi Blázquez, Núria Agulló, Joan Boada Grau, Ricardo Da S Torres, Joan García. Effect of bacteria density and accumulated inert solids on the effluent pollutant concentrations predicted by the constructed wetlands model BIO_PORE. Ecological Engineering. 2015; 80 ():172-180.

Chicago/Turabian Style

Roger Samsó; Jordi Blázquez; Núria Agulló; Joan Boada Grau; Ricardo Da S Torres; Joan García. 2015. "Effect of bacteria density and accumulated inert solids on the effluent pollutant concentrations predicted by the constructed wetlands model BIO_PORE." Ecological Engineering 80, no. : 172-180.

Journal article
Published: 14 January 2015 in Ecological Engineering
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During the last two decades a couple of models were developed for constructed wetlands with differing purposes. Meanwhile the usage of this kind of tool is generally accepted, but the misuse of the models still confirms the skepticism. Generally some groups of models can be distinguished: on one hand mechanistic models try to display the complex and diffuse interaction of occurring processes, on the other hand the same kind of models are used to investigate single processes. New kinds of ‘simplified’ approaches – well appreciated by engineers – try to display system performances without going to deep into details. All types of models are valuable – some more for scientific usage, others more for engineering. The given summary tries to support potential users in taking the right choice in model selection. Big differences can be found in the model availabilities. Whereas some of the compared software packages are purchasable without limitation, some others are only accessible on their platform level, and some can be seen as exclusive property. From the experience of the authors it can be summarized, that research groups starting modelling/simulation studies should be encouraged to use the given knowledge before starting from scratch again.

ACS Style

Daniel Meyer; Florent Chazarenc; Dominique Claveau-Mallet; Ulrich Dittmer; Nicolas Forquet; Pascal Molle; Ania Morvannou; Tamás Pálfy; Alain Petitjean; Anacleto Rizzo; Roger Samsó Campà; Miklas Scholz; Audrey Soric; Günter Langergraber. Modelling constructed wetlands: Scopes and aims – a comparative review. Ecological Engineering 2015, 80, 205 -213.

AMA Style

Daniel Meyer, Florent Chazarenc, Dominique Claveau-Mallet, Ulrich Dittmer, Nicolas Forquet, Pascal Molle, Ania Morvannou, Tamás Pálfy, Alain Petitjean, Anacleto Rizzo, Roger Samsó Campà, Miklas Scholz, Audrey Soric, Günter Langergraber. Modelling constructed wetlands: Scopes and aims – a comparative review. Ecological Engineering. 2015; 80 ():205-213.

Chicago/Turabian Style

Daniel Meyer; Florent Chazarenc; Dominique Claveau-Mallet; Ulrich Dittmer; Nicolas Forquet; Pascal Molle; Ania Morvannou; Tamás Pálfy; Alain Petitjean; Anacleto Rizzo; Roger Samsó Campà; Miklas Scholz; Audrey Soric; Günter Langergraber. 2015. "Modelling constructed wetlands: Scopes and aims – a comparative review." Ecological Engineering 80, no. : 205-213.

Book chapter
Published: 19 July 2014 in The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape
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Numerical models are recognized nowadays as a powerful tool to increase the understanding of the internals of constructed wetlands and to help improve their design. Over the last decade many models have been developed, and many simulation studies have been published. Despite diversity is generally a positive thing, having so many different models can be confusing for potential users and may also hinder further development of the existing ones. The aim of this paper is to summarize the state of the art of this discipline, focussing the attention on the most feature-rich process-based models for constructed wetlands for urban wastewater treatment. Their description is combined with a feature comparison in a tabular format to facilitate the selection of one or another based on the specific needs of the potential user. Moreover, a discussion is made regarding the advantages of each reviewed model regarding features, licencing and expected evolution of each of them. Later in the document, we describe the essential phenomena, parameters and processes that we believe that future generation of constructed wetlands models should incorporate, to guide further research on this discipline. Although this paper is focused on models used in academic circles, a model developed to optimize the design of combined sewer overflow wetlands is presented as an example of the potential of design-focused wetlands. At the end of the paper we provide an overview of the past, present and future of constructed wetlands models and analyse were we stand and which is the way to go and the main goals in the near future.

ACS Style

Roger Samsó; Daniel Meyer; Joan García. Subsurface Flow Constructed Wetland Models: Review and Prospects. The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape 2014, 149 -174.

AMA Style

Roger Samsó, Daniel Meyer, Joan García. Subsurface Flow Constructed Wetland Models: Review and Prospects. The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape. 2014; ():149-174.

Chicago/Turabian Style

Roger Samsó; Daniel Meyer; Joan García. 2014. "Subsurface Flow Constructed Wetland Models: Review and Prospects." The Role of Natural and Constructed Wetlands in Nutrient Cycling and Retention on the Landscape , no. : 149-174.

Journal article
Published: 01 March 2014 in Science of The Total Environment
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Despite the fact that horizontal subsurface flow constructed wetlands have been in operation for several decades now, there is still no clear understanding of some of their most basic internal functioning patterns. To fill this knowledge gap, on this paper we present what we callPostprint (published version

ACS Style

Roger Samsó; Joan García. The Cartridge Theory: A description of the functioning of horizontal subsurface flow constructed wetlands for wastewater treatment, based on modelling results. Science of The Total Environment 2014, 473-474, 651 -658.

AMA Style

Roger Samsó, Joan García. The Cartridge Theory: A description of the functioning of horizontal subsurface flow constructed wetlands for wastewater treatment, based on modelling results. Science of The Total Environment. 2014; 473-474 ():651-658.

Chicago/Turabian Style

Roger Samsó; Joan García. 2014. "The Cartridge Theory: A description of the functioning of horizontal subsurface flow constructed wetlands for wastewater treatment, based on modelling results." Science of The Total Environment 473-474, no. : 651-658.

Journal article
Published: 01 September 2013 in Science of The Total Environment
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Bacteria communities growing in constructed wetlands play a major role on the removal of pollutants from wastewater and the presence of a stable community is a critical factor affecting their performance. With this work we aimed at finding how long it takes for bacterial communities to stabilise in constructed wetlands and at answering specific questions regarding their abundance, spatial distribution and their relative importance on the treatment processes. To this end the numerical model BIO_PORE was used to simulate the dynamics of 6 functional bacteria groups (heterotrophic, autotrophic nitrifying, fermenting, acetotrophic methanogenic, acetotrophic sulphate reducing and sulphide oxidising bacteria) within a wetland for a period of 3 years. Three indicators of bacterial stabilisation were used: 1) total biomass; b) effluent pollutant concentrations and c) Shannon's diversity index. Results indicate that aerobic bacteria dominated the wetland until the 80th day of operation. Anaerobic bacteria dominated the wetland from that moment and until the end of the studied period. Bacteria stability was reached between 400 and 700 days after starting operation. Once the wetland reached stability, sulphate reducing bacteria accounted for the highest biomass of all bacterial groups (46%). The distribution of bacterial communities obtained after bacterial stability is consistent with available experimental results, and was clearly controlled by dissolved oxygen (SO) concentrations and H2S toxicity. After stability, the progressive accumulation of inert solids pushed the location of the active bacteria zone towards the outlet section.

ACS Style

Roger Samsó; Joan García. Bacteria distribution and dynamics in constructed wetlands based on modelling results. Science of The Total Environment 2013, 461-462, 430 -440.

AMA Style

Roger Samsó, Joan García. Bacteria distribution and dynamics in constructed wetlands based on modelling results. Science of The Total Environment. 2013; 461-462 ():430-440.

Chicago/Turabian Style

Roger Samsó; Joan García. 2013. "Bacteria distribution and dynamics in constructed wetlands based on modelling results." Science of The Total Environment 461-462, no. : 430-440.

Journal article
Published: 01 May 2013 in Ecological Engineering
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ACS Style

Roger Samsó; Joan Garcia. BIO_PORE, a mathematical model to simulate biofilm growth and water quality improvement in porous media: Application and calibration for constructed wetlands. Ecological Engineering 2013, 54, 116 -127.

AMA Style

Roger Samsó, Joan Garcia. BIO_PORE, a mathematical model to simulate biofilm growth and water quality improvement in porous media: Application and calibration for constructed wetlands. Ecological Engineering. 2013; 54 ():116-127.

Chicago/Turabian Style

Roger Samsó; Joan Garcia. 2013. "BIO_PORE, a mathematical model to simulate biofilm growth and water quality improvement in porous media: Application and calibration for constructed wetlands." Ecological Engineering 54, no. : 116-127.

Journal article
Published: 31 May 2011 in Ecological Engineering
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The aim of this study was to verify under lab conditions the reliability, repeatability and accuracy of the falling head method (FHM) for hydraulic conductivity measurements. The FHM is a reliable procedure that has slight variations (less than 10%) in repeated measurements and turns out to be a reliable technique to record the hydraulic conductivities typically described for clogged and unclogged subsurface-flow constructed wetlands (from 4 to ca. 360 m/day). The accuracy of the method is acceptable considering difficulties in the measurement of hydraulic conductivity in highly conductive media. Accordingly, results show measurement deviations of 20% when compared with a laboratory constant head method for highly conductive media (higher than 250 m/day), and 80% for media with low hydraulic conductivity (lower than 50 m/day). The main conclusion of the present paper is that of the FHM is a reliable and repeatable technique for hydraulic conductivity measurements and it is accurate enough for on-site clogging assessment in full-scale constructed wetlands.

ACS Style

Anna Pedescoll; Roger Samsó; Enrique Romero; Jaume Puigagut; Joan García. Reliability, repeatability and accuracy of the falling head method for hydraulic conductivity measurements under laboratory conditions. Ecological Engineering 2011, 37, 754 -757.

AMA Style

Anna Pedescoll, Roger Samsó, Enrique Romero, Jaume Puigagut, Joan García. Reliability, repeatability and accuracy of the falling head method for hydraulic conductivity measurements under laboratory conditions. Ecological Engineering. 2011; 37 (5):754-757.

Chicago/Turabian Style

Anna Pedescoll; Roger Samsó; Enrique Romero; Jaume Puigagut; Joan García. 2011. "Reliability, repeatability and accuracy of the falling head method for hydraulic conductivity measurements under laboratory conditions." Ecological Engineering 37, no. 5: 754-757.