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Dr. António A. Martins
Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto (FEUP), R. Dr. Roberto Frias S/N, 4200-465 Porto, Portugal

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0 microalgae
0 Sustentability
0 Energy Storage Systems
0 sustainable energy systems

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Review
Published: 11 August 2021 in International Journal of Environmental Research and Public Health
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Low indoor air quality is an increasingly important problem due to the spread of urbanization. Because people spend most of their time inside, poor indoor air quality causes serious human health issues, resulting in significant economic losses. In this work, the current state of affairs is presented and analyzed, focusing on the current problems and the available solutions to improve the quality of indoor air, and the use of nature-based solutions. These involve the cultivation of microalgae in closed photobioreactors. In these systems, photosynthetic organisms can capture CO2 and other pollutants generated in indoor environments, which they use to grow and develop biomass. Several possible layouts for the implementation of microalgae-based indoor air cleaning systems are presented, taking into account the systems that are currently available at a commercial scale. A critical analysis of the microalgae indoor purification systems is presented, highlighting their advantages and disadvantages, and suggesting potential improvements and future lines of research and development in the area.

ACS Style

Teresa M. Mata; Gisela M. Oliveira; Helena Monteiro; Gabriela Ventura Silva; Nídia S. Caetano; António A. Martins. Indoor Air Quality Improvement Using Nature-Based Solutions: Design Proposals to Greener Cities. International Journal of Environmental Research and Public Health 2021, 18, 8472 .

AMA Style

Teresa M. Mata, Gisela M. Oliveira, Helena Monteiro, Gabriela Ventura Silva, Nídia S. Caetano, António A. Martins. Indoor Air Quality Improvement Using Nature-Based Solutions: Design Proposals to Greener Cities. International Journal of Environmental Research and Public Health. 2021; 18 (16):8472.

Chicago/Turabian Style

Teresa M. Mata; Gisela M. Oliveira; Helena Monteiro; Gabriela Ventura Silva; Nídia S. Caetano; António A. Martins. 2021. "Indoor Air Quality Improvement Using Nature-Based Solutions: Design Proposals to Greener Cities." International Journal of Environmental Research and Public Health 18, no. 16: 8472.

Review
Published: 22 December 2020 in Processes
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Several microalgae species have been exploited due to their great biotechnological potential for the production of a range of biomolecules that can be applied in a large variety of industrial sectors. However, the major challenge of biotechnological processes is to make them economically viable, through the production of commercially valuable compounds. Most of these compounds are accumulated inside the cells, requiring efficient technologies for their extraction, recovery and purification. Recent improvements approaching physicochemical treatments (e.g., supercritical fluid extraction, ultrasound-assisted extraction, pulsed electric fields, among others) and processes without solvents are seeking to establish sustainable and scalable technologies to obtain target products from microalgae with high efficiency and purity. This article reviews the currently available approaches reported in literature, highlighting some examples covering recent granted patents for the microalgae’s components extraction, recovery and purification, at small and large scales, in accordance with the worldwide trend of transition to bio-based products.

ACS Style

Priscila S. Corrêa; Wilson G. Morais Júnior; António A. Martins; Nídia S. Caetano; Teresa M. Mata. Microalgae Biomolecules: Extraction, Separation and Purification Methods. Processes 2020, 9, 10 .

AMA Style

Priscila S. Corrêa, Wilson G. Morais Júnior, António A. Martins, Nídia S. Caetano, Teresa M. Mata. Microalgae Biomolecules: Extraction, Separation and Purification Methods. Processes. 2020; 9 (1):10.

Chicago/Turabian Style

Priscila S. Corrêa; Wilson G. Morais Júnior; António A. Martins; Nídia S. Caetano; Teresa M. Mata. 2020. "Microalgae Biomolecules: Extraction, Separation and Purification Methods." Processes 9, no. 1: 10.

Journal article
Published: 07 August 2020 in The Electricity Journal
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Portugal has made great progress in implementing renewable energy systems (RES) to use its endogenous renewable resources. As the cost of renewable energy generation is decreasing, mainly for photovoltaic energy, a significant increase in its production is expected, in particular at the local and domestic levels. Yet, much investment and development is still needed to fulfil the goals for renewable energy generation defined by the Portuguese government and the European Union, in order to decarbonize energy generation and reduce energy dependence. Besides limitations in the installed capacity, the full potential of existing and future RES is not fulfilled, mainly due to imbalances in supply and demand, resulting from the varying climatic conditions and limited energy storage capacity. Although some investment was made in large scale Energy Storage Systems (ESS), especially pumped hydro, distributed energy storage (DES), in particular for stationary domestic storage appliances, have received little attention from decision makers. When properly defined, designed and implemented, they can contribute to increase the efficiency of existing and future RES and the capacity factor. Thus, in this work the questions regarding the implementation of DES are analysed. The main criteria that have to be considered when selecting the proper storage technology for DES are defined, taking into account information and data from current legislation and/or strategic plans and goals, and the technical and scientific literature, in order to support decision making and policy definition at different levels. The proposed application of the various criteria leads to the conclusion that for DES, electrochemical based ESS are the most adequate, among which Li ion batteries and redox flow batteries, particularly suited for local and/or household applications. The current policies sought out for Portugal are also examined in order to identify which aspects should be improved to promote and increase the relevance of DES in the Portuguese energy mix, and it is concluded that specific policies and support are needed to increase the relevance of decentralized electricity storage systems.

ACS Style

António Martins; Marta G. Mota; Nídia S. Caetano; Teresa Mata. Decentralized electricity storage evaluation in the Portuguese context. The Electricity Journal 2020, 33, 106822 -106822.

AMA Style

António Martins, Marta G. Mota, Nídia S. Caetano, Teresa Mata. Decentralized electricity storage evaluation in the Portuguese context. The Electricity Journal. 2020; 33 (8):106822-106822.

Chicago/Turabian Style

António Martins; Marta G. Mota; Nídia S. Caetano; Teresa Mata. 2020. "Decentralized electricity storage evaluation in the Portuguese context." The Electricity Journal 33, no. 8: 106822-106822.

Paper
Published: 03 June 2020 in RSC Advances
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A Ni phase dispersed in CO2 is used with a K promoter in the BRM. The LDH support structure collapses at high temperatures, inducing large Ni crystal sizes, and disfavoring activity. The catalyst is compensated by the K promoter, and the formation of an Mg–Al-spinel.

ACS Style

Adelino F. Cunha; Sergio Morales-Torres; Luisa M. Pastrana-Martínez; António A. Martins; Teresa M. Mata; Nídia S. Caetano; José M. Loureiro. Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material. RSC Advances 2020, 10, 21158 -21173.

AMA Style

Adelino F. Cunha, Sergio Morales-Torres, Luisa M. Pastrana-Martínez, António A. Martins, Teresa M. Mata, Nídia S. Caetano, José M. Loureiro. Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material. RSC Advances. 2020; 10 (36):21158-21173.

Chicago/Turabian Style

Adelino F. Cunha; Sergio Morales-Torres; Luisa M. Pastrana-Martínez; António A. Martins; Teresa M. Mata; Nídia S. Caetano; José M. Loureiro. 2020. "Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material." RSC Advances 10, no. 36: 21158-21173.

Journal article
Published: 22 April 2020 in Journal of Cleaner Production
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Biofuels from microalgae have the potential to replace fossil fuels, without competing with other products derived from crops. This study aims to perform a cradle-to-gate Life Cycle Assessment of the industrial production of microalgal biodiesel, using an autochthonous Chilean Phaeodactylum tricornutum strain, considering 1 MJ of biodiesel as the functional unit. For the compilation of the Life Cycle Inventory, real experimental data were obtained from the pilot-scale cultivation in a photobioreactor (PBR) module located in the city of Concepción, in Chile. The scale-up to the industrial plant considers that PBR modules are of the same size as those used in the pilot-scale. The Life Cycle Impacts Analysis considered the ReCiPe 2016 Endpoint (H) V1.00 method. Results show that the whole process contributes to a total of 5.74 kgCO2eq per MJ of biodiesel produced. PBR construction materials and energy consumption are the main contributors to the life cycle environmental impacts. The sensitivity analysis shows that energy consumption, water reuse and transportation distance of seawater from ocean to the industrial plant are the critical parameters that most affect the overall environmental performance of the system. The rate of water reuse is particularly critical to the global warming potential. Results also show that the valorization of co-products is an important aspect to improve the environmental performance of microalgal biodiesel production. Therefore, this study supports the decision-making process in biofuel production to promote the development of sustainable pilot and large-scale algae-based industry.

ACS Style

Monique Branco-Vieira; Daniele Mesquita Bordalo da Costa; Teresa Mata; António Martins; Marcos A.V. Freitas; Nídia Caetano. Environmental assessment of industrial production of microalgal biodiesel in central-south Chile. Journal of Cleaner Production 2020, 266, 121756 .

AMA Style

Monique Branco-Vieira, Daniele Mesquita Bordalo da Costa, Teresa Mata, António Martins, Marcos A.V. Freitas, Nídia Caetano. Environmental assessment of industrial production of microalgal biodiesel in central-south Chile. Journal of Cleaner Production. 2020; 266 ():121756.

Chicago/Turabian Style

Monique Branco-Vieira; Daniele Mesquita Bordalo da Costa; Teresa Mata; António Martins; Marcos A.V. Freitas; Nídia Caetano. 2020. "Environmental assessment of industrial production of microalgal biodiesel in central-south Chile." Journal of Cleaner Production 266, no. : 121756.

Journal article
Published: 14 February 2020 in Fuel
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Microalgae are a rich source of proteins, carbohydrates and lipids, among other components, and thus, are considered to be the next generation biomass. However, in order to enhance the economic viability of its industrial production, all biomass components need to be valorized, requiring a multi-product biorefinery. Thus, this work proposes and conceptually analyses biorefinery processes for valorizing Phaeodactylum tricornutum for biofuels and high-value compounds, based on real data from a pilot-scale process. The algal biomass was biochemically characterized and the production was scaled-up to an industrial approach to analyze three biorefinery configurations, based on a 18 ton·year−1 of microalga biomass. The biomass revealed a composition of 7.85 wt% carbohydrates, 38.40 wt% proteins, 9.08 wt% lipids, 0.86 wt% fucoxanthin and 5.19 wt% biosilica. The biorefinery process addressed for biofuels production has an estimated annual production of 1.72, 0.35 and 1361 m3·year−1 of respectively biodiesel, bioethanol and biomethane. The biorefinery addressed for high-value compounds yields 0.18, 0.93 and 6.95 ton·year−1 of respectively fucoxanthin, biosilica and protein. The biorefinery designed for valorizing full microalgae biomass, showed to be more beneficial for promoting a circular economy. Biorefinery approach is useful for making sound and profitable decisions regarding microalgae bioproducts.

ACS Style

Monique Branco-Vieira; Sergio San Martin; Cristian Agurto; Marcos A.V. Freitas; António Martins; Teresa Mata; Nídia Caetano. Biotechnological potential of Phaeodactylum tricornutum for biorefinery processes. Fuel 2020, 268, 117357 .

AMA Style

Monique Branco-Vieira, Sergio San Martin, Cristian Agurto, Marcos A.V. Freitas, António Martins, Teresa Mata, Nídia Caetano. Biotechnological potential of Phaeodactylum tricornutum for biorefinery processes. Fuel. 2020; 268 ():117357.

Chicago/Turabian Style

Monique Branco-Vieira; Sergio San Martin; Cristian Agurto; Marcos A.V. Freitas; António Martins; Teresa Mata; Nídia Caetano. 2020. "Biotechnological potential of Phaeodactylum tricornutum for biorefinery processes." Fuel 268, no. : 117357.

Conference info
Published: 01 February 2020 in Energy Reports
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Buildings are responsible for a significant part of the global energy consumption. Besides the need to improve their energy efficiency, new buildings also need to generate their own energy, preferably from renewable sources, to become more sustainable. As renewable energy generation is strongly dependent on the climatic conditions, energy storage must be considered when designing such a system. In this study, a cradle-to-grave life cycle assessment (LCA) study of a renewable energy generation system with a prototype Vanadium flow battery integrated in a Near Zero Energy Building (NZEB) is performed. A combined grid-connected PV and a solar thermal system generates the energy, and it was dimensioned to supply the annual energy needs of a household in Porto, Portugal considering the local climatic conditions. As an end of life scenario, it is assumed that the battery is dismantled and most of the materials are recycled. A functional unit of 1 kWh of supplied energy to the system was considered, and study results show that environmental impacts are reduced when the energy is produced onsite and the battery components are recycled or reused. A sensitivity analysis was conducted changing the household’s geographic location.

ACS Style

Joana Gouveia; E. Silva; Teresa Mata; A. Mendes; Nídia Caetano; A.A. Martins. Life cycle assessment of a renewable energy generation system with a vanadium redox flow battery in a NZEB household. Energy Reports 2020, 6, 87 -94.

AMA Style

Joana Gouveia, E. Silva, Teresa Mata, A. Mendes, Nídia Caetano, A.A. Martins. Life cycle assessment of a renewable energy generation system with a vanadium redox flow battery in a NZEB household. Energy Reports. 2020; 6 ():87-94.

Chicago/Turabian Style

Joana Gouveia; E. Silva; Teresa Mata; A. Mendes; Nídia Caetano; A.A. Martins. 2020. "Life cycle assessment of a renewable energy generation system with a vanadium redox flow battery in a NZEB household." Energy Reports 6, no. : 87-94.

Conference info
Published: 01 February 2020 in Energy Reports
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In spite of raising awareness of the environmental impacts associated to the production and utilization of plastics, in many situations, the use of plastics is advantageous, and options are still unavailable or under development, representing an opportunity to develop more sustainable options, such as less energy intensive solutions. In this work, the LCA methodology is used to evaluate the environmental impacts of boxes, bowls and plates produced using Areca palm (Areca catechu) sheath, a waste material common in southern India. The inventory is a combination of primary data from a company in India, complemented with secondary data from the Ecoinvent v2.1 (Simapro V7.3). Results show that the main contributors to the potential environmental impact categories and the most energy intensive life cycle steps, are transportation, shipping and electricity generation. Carbon footprints of 1180, 1033 and 1090 kg CO2eq/ton were obtained for Areca boxes, plates and bowls, respectively. Plates made from Areca palm sheath have lower environmental impacts than plastic plates, except in the ozone layer depletion and terrestrial toxicity impact categories.

ACS Style

Anirudh Gautam; Teresa Mata; António A. Martins; Nídia Caetano. Evaluation of Areca palm renewable options to replace disposable plastic containers using life cycle assessment methodology. Energy Reports 2020, 6, 80 -86.

AMA Style

Anirudh Gautam, Teresa Mata, António A. Martins, Nídia Caetano. Evaluation of Areca palm renewable options to replace disposable plastic containers using life cycle assessment methodology. Energy Reports. 2020; 6 ():80-86.

Chicago/Turabian Style

Anirudh Gautam; Teresa Mata; António A. Martins; Nídia Caetano. 2020. "Evaluation of Areca palm renewable options to replace disposable plastic containers using life cycle assessment methodology." Energy Reports 6, no. : 80-86.

Conference info
Published: 01 February 2020 in Energy Reports
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New processes that may reduce the net carbon emissions and contribute to a more circular economy are needed. Bi-reforming of methane (BRM) is a promising method for syngas production, with a hydrogen-to-carbon monoxide ratio of two in the reaction products, relevant for example when the purpose is methanol synthesis. In this work, reaction studies were carried out over a nickel-based catalyst varying the temperature (798–1123 K). Three main temperature zones have been identified; a low temperature zone where the conversion of carbon dioxide is almost null, a middle temperature range where steam reforming of methane (SRM) is dominant while the conversion of carbon dioxide via dry reforming of methane (DRM) is low, and finally a high temperature range where DRM becomes more significant. The results show that syngas can be successfully produced using this process. For the range of operating conditions studied, the carbon dioxide and methane conversions increase with temperature, reaching 40% and 100%, respectively at the largest temperature studied. However, the production of syngas in a molar ratio of 1:2 for CO-to-H2 requires the use of high temperatures. Most probably the nickel agglomerates on top of the γ-alumina support are responsible for the poor catalyst performance.

ACS Style

Adelino F. Cunha; Teresa Mata; Nídia Caetano; António Martins; J.M. Loureiro. Catalytic bi-reforming of methane for carbon dioxide ennoblement. Energy Reports 2020, 6, 74 -79.

AMA Style

Adelino F. Cunha, Teresa Mata, Nídia Caetano, António Martins, J.M. Loureiro. Catalytic bi-reforming of methane for carbon dioxide ennoblement. Energy Reports. 2020; 6 ():74-79.

Chicago/Turabian Style

Adelino F. Cunha; Teresa Mata; Nídia Caetano; António Martins; J.M. Loureiro. 2020. "Catalytic bi-reforming of methane for carbon dioxide ennoblement." Energy Reports 6, no. : 74-79.

Conference info
Published: 01 February 2020 in Energy Reports
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Microalgae have been reported as a promising alternative for biofuels production. However, the use of microalgae for biofuels is still a challenge due to the intense energy use and the generation of a significant amount of biomass residues in the process. In order to analyze the environmental impacts of different technological processes for the production of biodiesel from microalgae, several studies have been published making use of the Life Cycle Assessment (LCA) methodology, which allows the recognition of the process bottlenecks and supports the identification of alternatives for a more efficient use of the feedstock. Therefore, in this study, a Life Cycle Inventory (LCI) is compiled, based on real pilot-scale process data, which was scaled-up to a microalgae biomass industrial plant for biofuel production. Values of energy, nutrients, water, and materials consumption are used to create an inventory of inputs and outputs for biomass cultivation and biodiesel production, in order to acquire data to conduct a complete LCA modeling in future studies. According to this model, to produce 1 kg of biodiesel it is necessary about 12 kg of dried algae biomass. This study supports the decision-making process in biofuel production to promote the development of sustainable pilot and large-scale algae-based industry, through the identification of critical factors.

ACS Style

M. Branco-Vieira; Daniele Mesquita Bordalo da Costa; Teresa Mata; António Martins; M.A.V. Freitas; Nídia Caetano. A life cycle inventory of microalgae-based biofuels production in an industrial plant concept. Energy Reports 2020, 6, 397 -402.

AMA Style

M. Branco-Vieira, Daniele Mesquita Bordalo da Costa, Teresa Mata, António Martins, M.A.V. Freitas, Nídia Caetano. A life cycle inventory of microalgae-based biofuels production in an industrial plant concept. Energy Reports. 2020; 6 ():397-402.

Chicago/Turabian Style

M. Branco-Vieira; Daniele Mesquita Bordalo da Costa; Teresa Mata; António Martins; M.A.V. Freitas; Nídia Caetano. 2020. "A life cycle inventory of microalgae-based biofuels production in an industrial plant concept." Energy Reports 6, no. : 397-402.

Conference info
Published: 01 February 2020 in Energy Reports
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The growing impacts of climate change mainly due to the increasing emissions of GHG, especially carbon dioxide, has led to the development and implementation of specific strategies and policies to reduce them. Carbon capture and utilization (CCU) is currently seen as a good option, as it contributes to reduce the net carbon emissions and fulfil the goals of the Paris Agreement. This work analyses the economic potential of CO2 biofixation by microalgae from the exhaust gas of a Portuguese Natural Gas Combined Cycle (NGCC) power plant. Literature and real operational data are used, collected from reports of Portuguese power generation companies. A preliminary design and economic analysis of the carbon biofixation system was done. Results show that, although requiring a very large investment, the process is economically viable. In further studies a more in depth approach and detailed project combined with a sensitivity analysis, and a comparison with the chemical based CO2 fixation will be done.

ACS Style

Gisela M. Oliveira; Nídia Caetano; Teresa Mata; António A. Martins. Biofixation of CO2 emissions from natural gas combined cycle power plant. Energy Reports 2020, 6, 140 -146.

AMA Style

Gisela M. Oliveira, Nídia Caetano, Teresa Mata, António A. Martins. Biofixation of CO2 emissions from natural gas combined cycle power plant. Energy Reports. 2020; 6 ():140-146.

Chicago/Turabian Style

Gisela M. Oliveira; Nídia Caetano; Teresa Mata; António A. Martins. 2020. "Biofixation of CO2 emissions from natural gas combined cycle power plant." Energy Reports 6, no. : 140-146.

Conference info
Published: 01 February 2020 in Energy Reports
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Battery storage technologies have been showing great potential to address the vulnerability of renewable electricity generation systems. Among the various options, vanadium redox flow batteries are one of the most promising in the energy storage market. In this work, a life cycle assessment of a 5 kW vanadium redox flow battery is performed on a cradle-to-gate approach with focus on the vanadium electrolytes, since they determine the battery’s storage capacity and can be readjusted and reused indefinitely. The functional unit is 1 kWh stored by the battery. The initial results show that the environmental hotspots reside mainly in the structural and material components of the battery, evidencing the need for alternative or recycled materials, preferably produced locally. Since the quantity of electrolytes determine the amount of storable electricity, an analysis was conducted on the variation of the impacts with the increase of storage capacity. An alternative scenario with reused electrolytes was also performed. Results show that with the increase of storage capacity, the contribution of the electrolytes to the impacts decrease significantly by stored kWh. In the reused electrolytes scenario, impacts were reduced mainly for the Acidification and Mineral, fossil and renewable resource depletion categories.

ACS Style

Joana Gouveia; A. Mendes; R. Monteiro; Teresa Mata; Nídia Caetano; A.A. Martins. Life cycle assessment of a vanadium flow battery. Energy Reports 2020, 6, 95 -101.

AMA Style

Joana Gouveia, A. Mendes, R. Monteiro, Teresa Mata, Nídia Caetano, A.A. Martins. Life cycle assessment of a vanadium flow battery. Energy Reports. 2020; 6 ():95-101.

Chicago/Turabian Style

Joana Gouveia; A. Mendes; R. Monteiro; Teresa Mata; Nídia Caetano; A.A. Martins. 2020. "Life cycle assessment of a vanadium flow battery." Energy Reports 6, no. : 95-101.

Conference info
Published: 01 February 2020 in Energy Reports
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The increase in the world’s energy demand has contributed to the emergence of new sustainable energy sources, such as microalgae, with their great potential to provide biofuels and other high value co-products for the food and health’s markets. However, current biorefinery methodologies are either too complex to extract the targeted components such as high-value products, or require solvents with toxicity for humans and the environment. This work aims to evaluate different lipid extraction approaches applied to three microalgal species: Chlorella zofingiensis, Phaeodactylum tricornutum, and Arthrospira platensis, while employing less toxic and more economical solvents for the lipids extraction. Experimental results showed a promising outcome to tune current biorefinery methodologies, enhancing product yield as well as decreasing potential hazards.

ACS Style

M. Gorgich; T.M. Mata; A.A. Martins; Monique Branco Vieira; N.S. Caetano. Comparison of different lipid extraction procedures applied to three microalgal species. Energy Reports 2020, 6, 477 -482.

AMA Style

M. Gorgich, T.M. Mata, A.A. Martins, Monique Branco Vieira, N.S. Caetano. Comparison of different lipid extraction procedures applied to three microalgal species. Energy Reports. 2020; 6 ():477-482.

Chicago/Turabian Style

M. Gorgich; T.M. Mata; A.A. Martins; Monique Branco Vieira; N.S. Caetano. 2020. "Comparison of different lipid extraction procedures applied to three microalgal species." Energy Reports 6, no. : 477-482.

Conference info
Published: 20 November 2019 in Energy Reports
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The decline in annual rainfall, coupled with the growing demand for water in agricultural fields, triggered a new crisis in today’s world. Thus, the focus is on finding solutions to new water resources. Taking a look at the normal daily life, most of the households’ effluents can be ranked into a less-polluted category, called greywater. Excluding human dejects, greywater comprises the outflow from washing machines, dishwashers and bathtubs. It is considered an effluent with a more economic treatment, because it contains less microbial pollution. Hence, this work revises the effects of greywater irrigation on the quality of crops, and provides a comprehensive study of the effects of greywater on the quality of soil. Furthermore, a comprehensive discussion is carried out to evaluate the energy consumption of facilities for both greywater and wastewater treatment to provide water used in irrigation. It also addresses current methodologies for treating greywater and evaluates the effects of crops irrigation with treated and untreated greywater, indicating the type of treatment chosen depending on the type of crop to be irrigated.

ACS Style

M. Gorgich; T.M. Mata; A Martins; N.S. Caetano; N. Formigo. Application of domestic greywater for irrigating agricultural products: A brief study. Energy Reports 2019, 6, 811 -817.

AMA Style

M. Gorgich, T.M. Mata, A Martins, N.S. Caetano, N. Formigo. Application of domestic greywater for irrigating agricultural products: A brief study. Energy Reports. 2019; 6 ():811-817.

Chicago/Turabian Style

M. Gorgich; T.M. Mata; A Martins; N.S. Caetano; N. Formigo. 2019. "Application of domestic greywater for irrigating agricultural products: A brief study." Energy Reports 6, no. : 811-817.

Conference info
Published: 12 September 2019 in Energy Reports
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This study aims to evaluate the influence of cultivation conditions on the bioenergy and high value biocompounds contents of Chlorella vulgaris. Results show that the use of nitrate rich media, from 170.7 mg/L, favors a faster biomass growth, reaching values above 800 mg/L biomass. In addition, it favors higher pigments concentrations with more emphasis for the cultures with a nitrate concentration of 569 mg/L, where chlorophyll-a and carotenoids reached maximum concentrations of 6 and 2 mg/L, respectively. As regards the lipid content, nitrate deprivation (<28.4 mg/L) favors the accumulation of lipid content by microalgae (around 42%). The use of media with lower iron concentrations (0.5 mg/L) was favorable for obtaining biomass with higher concentrations of chlorophyll-a, at an initial stage, with values varying from 0.2 to 0.6 mg/L. In the tests carried out under mixotrophic conditions (addition of glucose), it was observed that contamination occurred in all the cultures, possibly due to the high concentration of carbon source that had values between 0.5 and 1.5 g/L of glucose, and consequently, growth decreased.

ACS Style

N. Caetano; A.R. Melo; Malihe Gorgich; Monique Branco Vieira; António Martins; Teresa Mata. Influence of cultivation conditions on the bioenergy potential and bio-compounds of Chlorella vulgaris. Energy Reports 2019, 6, 378 -384.

AMA Style

N. Caetano, A.R. Melo, Malihe Gorgich, Monique Branco Vieira, António Martins, Teresa Mata. Influence of cultivation conditions on the bioenergy potential and bio-compounds of Chlorella vulgaris. Energy Reports. 2019; 6 ():378-384.

Chicago/Turabian Style

N. Caetano; A.R. Melo; Malihe Gorgich; Monique Branco Vieira; António Martins; Teresa Mata. 2019. "Influence of cultivation conditions on the bioenergy potential and bio-compounds of Chlorella vulgaris." Energy Reports 6, no. : 378-384.

Conference paper
Published: 19 February 2019 in BIO Web of Conferences
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The challenges of sustainability are transversal to all human activities, and the wine sector has its own role to play in the march for a more sustainable development. The proper definition of the most adequate measures and/or policies must be based on an objective and quantitative evaluation of the sustainability of a product or process. In this work the sustainability of a “terroir” wine is assessed taking into account its life cycle and using the following indicators: carbon and water footprint, material intensity, solid waste generated, worker turnover rate, investment in H&S training and EBITDA. All indicators are expressed per functional unit of 0.75 L of wine. The evaluation used data from the company complemented with data/information from the literature or life cycle inventory databases. To account for climatic variability, data from three consecutive years was used. Average values of 3.51 kgCO2eq and 481.4 L per functional unit were obtained for the carbon and water footprint respectively, both values within the range of values reported in the literature.

ACS Style

António Martins; Maria Costa; A.R. Araújo; A. Morgado; J.M. Pereira; N. Fontes; A. Graça; N.S. Caetano; Teresa Mata. Sustainability evaluation of a Portuguese “terroir” wine. BIO Web of Conferences 2019, 12, 03017 .

AMA Style

António Martins, Maria Costa, A.R. Araújo, A. Morgado, J.M. Pereira, N. Fontes, A. Graça, N.S. Caetano, Teresa Mata. Sustainability evaluation of a Portuguese “terroir” wine. BIO Web of Conferences. 2019; 12 ():03017.

Chicago/Turabian Style

António Martins; Maria Costa; A.R. Araújo; A. Morgado; J.M. Pereira; N. Fontes; A. Graça; N.S. Caetano; Teresa Mata. 2019. "Sustainability evaluation of a Portuguese “terroir” wine." BIO Web of Conferences 12, no. : 03017.

Journal article
Published: 01 October 2018 in Energy Procedia
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This work aims to evaluate the water footprint of microalgae cultivation in a closed pilot-scale multi-tubular photobioreactor, taking into account the life cycle stages of reactor construction and its operation for microalgae cultivation, on a gate-to-gate approach. The data was obtained from real production conditions complemented with data from the literature and life cycle inventory databases. Results indicate that the total water footprint lies in the range of 2.4-6.8 m3/kg dry biomass, being the PBR operation stage responsible for the largest contribution (> 60 %), mainly due to water consumption associated to electricity and nutrients production for the PBR operation.

ACS Style

António A. Martins; Francisca Marques; Madalena Cameira; Edgar Santos; Sara Badenes; Luís Costa; Vitor Verdelho Vieira; Nídia S. Caetano; Teresa M. Mata. Water footprint of microalgae cultivation in photobioreactor. Energy Procedia 2018, 153, 426 -431.

AMA Style

António A. Martins, Francisca Marques, Madalena Cameira, Edgar Santos, Sara Badenes, Luís Costa, Vitor Verdelho Vieira, Nídia S. Caetano, Teresa M. Mata. Water footprint of microalgae cultivation in photobioreactor. Energy Procedia. 2018; 153 ():426-431.

Chicago/Turabian Style

António A. Martins; Francisca Marques; Madalena Cameira; Edgar Santos; Sara Badenes; Luís Costa; Vitor Verdelho Vieira; Nídia S. Caetano; Teresa M. Mata. 2018. "Water footprint of microalgae cultivation in photobioreactor." Energy Procedia 153, no. : 426-431.

Journal article
Published: 01 October 2018 in Energy Procedia
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This work aims to evaluate the carbon footprint (CF) of microalgae production in a closed pilot-scale multi-tubular photobioreactor (PBR), on a gate-to-gate approach. Primary data from real production conditions complemented with data from the literature and life cycle inventory databases was used. The carbon embedded in the PBR’s construction materials and nutrients necessary for the microalgae growth were considered. A global CF of 68.34 kg CO2-eq/kg dry biomass was obtained. A CF of 1.72 kg CO2-eq/kg dry biomass was calculated for the PBR construction stage, contributing to 3 % of the overall value. For 74 kg of dry biomass/year produced with this PBR, the CF for this stage was 66.62 kg CO2-eq/kg dry biomass, corresponding to 97 % of the total global CF. In this study, electricity production for the reactor operation is the major contributor (79 %) to the overall CF, followed by the production of nutrients used to prepare the culture medium (21 %). CO2 fixation by microalgae reduces the global value by 3 %.

ACS Style

Teresa M. Mata; Madalena Cameira; Francisca Marques; Edgar Santos; Sara Badenes; Luis Costa; Vitor Verdelho Vieira; Nídia Caetano; António Martins. Carbon footprint of microalgae production in photobioreactor. Energy Procedia 2018, 153, 432 -437.

AMA Style

Teresa M. Mata, Madalena Cameira, Francisca Marques, Edgar Santos, Sara Badenes, Luis Costa, Vitor Verdelho Vieira, Nídia Caetano, António Martins. Carbon footprint of microalgae production in photobioreactor. Energy Procedia. 2018; 153 ():432-437.

Chicago/Turabian Style

Teresa M. Mata; Madalena Cameira; Francisca Marques; Edgar Santos; Sara Badenes; Luis Costa; Vitor Verdelho Vieira; Nídia Caetano; António Martins. 2018. "Carbon footprint of microalgae production in photobioreactor." Energy Procedia 153, no. : 432-437.

Original paper
Published: 05 June 2018 in Waste and Biomass Valorization
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The reduction of the fish oil acidity is a significant problem in the rendering industry, as the oil’s range of applications and market value strongly depend on this parameter. In particular, the lower the acidity, the larger the oil’s market value. This work aims to study the potential of enzymatic esterification for reducing the fish oil acidity, by converting the free fatty acids into esters. Thus, four commercial lipases were used and a parametric study was performed to identify the best operating conditions, varying the reaction temperature, enzyme/oil mass ratio and alcohol/FFA mass ratio. All experiments were performed in duplicate with a very good reproducibility of results. Results showed that Lipozyme TL 100L contributed to greater acidity reduction (75% from an initial acid value of 10–14 mg KOH/g oil) for esterification at 40 °C, using ethanol 96% v/v, enzyme/oil and alcohol/FFA mass ratios of 0.01 and 3.24 w/w, respectively, reaching 3.13 mg KOH/g oil of final acid value or 1.57% FFA content. The reaction kinetics were also studied and it was found that a second order rate law as a function of the alcohol and oil concentrations is more adequate, with 35.44 kJ/mol of activation energy and 1.94 × 103 L mol− 1 min− 1 of pre-exponential factor. In conclusion, this work shows that the enzymatic esterification to reduce the fish oil acidity is technically feasible, increasing its market value.

ACS Style

Teresa M. Mata; Daniela Correia; Soraia Andrade; Susana Casal; Isabel M. P. L. V. O. Ferreira; Elisabete Matos; António A. Martins; Nídia S. Caetano. Fish Oil Enzymatic Esterification for Acidity Reduction. Waste and Biomass Valorization 2018, 11, 1131 -1141.

AMA Style

Teresa M. Mata, Daniela Correia, Soraia Andrade, Susana Casal, Isabel M. P. L. V. O. Ferreira, Elisabete Matos, António A. Martins, Nídia S. Caetano. Fish Oil Enzymatic Esterification for Acidity Reduction. Waste and Biomass Valorization. 2018; 11 (3):1131-1141.

Chicago/Turabian Style

Teresa M. Mata; Daniela Correia; Soraia Andrade; Susana Casal; Isabel M. P. L. V. O. Ferreira; Elisabete Matos; António A. Martins; Nídia S. Caetano. 2018. "Fish Oil Enzymatic Esterification for Acidity Reduction." Waste and Biomass Valorization 11, no. 3: 1131-1141.

Article
Published: 31 May 2018 in Environment, Development and Sustainability
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This article presents and describes the LCA4Power tool, developed in this work to assess the potential environmental impacts, as, for example, the contribution to global warming, of electricity generation in continental Portugal, not considering the Madeira and Azores archipelagos. Based on a life cycle perspective, the tool considers the life cycles of various available technologies for producing electricity, on a cradle-to-gate perspective, excluding distribution and final use. It was implemented in MS Excel™ using emission factors obtained from the literature and other sources, instead of raw life cycle inventory data. The current version of the tool includes wind and hydroelectric power as renewable energy sources, and thermal and combined heat and power generation from fossil fuels as non-renewable energy sources. The combination of the aforementioned electricity generation technologies is responsible for more than 90% of the electricity generated in continental Portugal. Results were validated comparing the tool’s predictions with data from other LCA studies of electricity production, showing a good agreement, in particular for the greenhouse gas emissions. As added value, this tool provides a user-friendly way of simulating the potential environmental impacts of different endogenous energy mixes in Portugal, thus support decision making and communication. Future developments of the tool will include other technologies for electricity generation and its application to support decision making through the analysis of future scenarios for electricity generation in Portugal.

ACS Style

António A. Martins; Marta Simaria; Joaquim Barbosa; Ricardo Barbosa; Daniela T. Silva; Cristina S. Rocha; Teresa M. Mata; Nídia S. Caetano. Life cycle assessment tool of electricity generation in Portugal. Environment, Development and Sustainability 2018, 20, 129 -143.

AMA Style

António A. Martins, Marta Simaria, Joaquim Barbosa, Ricardo Barbosa, Daniela T. Silva, Cristina S. Rocha, Teresa M. Mata, Nídia S. Caetano. Life cycle assessment tool of electricity generation in Portugal. Environment, Development and Sustainability. 2018; 20 (S1):129-143.

Chicago/Turabian Style

António A. Martins; Marta Simaria; Joaquim Barbosa; Ricardo Barbosa; Daniela T. Silva; Cristina S. Rocha; Teresa M. Mata; Nídia S. Caetano. 2018. "Life cycle assessment tool of electricity generation in Portugal." Environment, Development and Sustainability 20, no. S1: 129-143.