Nídia Sá Caetano

Nídia Sá Caetano
Polytechnic Institute of Porto | IPP · Department of Chemical Engineering

PhD Chemical Engineering

About

146
Publications
70,718
Reads
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6,985
Citations
Additional affiliations
January 2013 - January 2017
Polytechnic Institute of Porto; LEPABE
Position
  • Coordinator Professor; Collaborator of CIETI and External Researcher with LEPABE
March 1998 - present
University of Porto
Position
  • Researcher
November 1992 - present
Polytechnic Institute of Porto
Position
  • Coordinator Professor

Publications

Publications (146)
Article
Full-text available
Increasing end-of-life material recovery and its application in new products is essential to reduce resource consumption. This paper assesses the cradle-to-gate life cycle energy and carbon dioxide (CO2) emissions of a new road safety barrier product to be installed around guardrails’ poles. To analyze the potential life cycle benefit of incorporat...
Article
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Rural farms are typically energy-intensive facilities with relatively low energy efficiency. In this sector, the introduction of renewable energies and integrated resource management technologies has been slower than in the domestic and industrial sector. The introduction of renewable energy sources was an important step in the past, but they are c...
Article
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Bioethanol is the most widely used biofuel in the world. Bioethanol production from biomass is a way to reduce crude oil consumption and the environmental pollution. This work aims to evaluate the potential environmental impacts of bioethanol production from corn stover obtained from phytoremediation, comparing four different acids (Sulfuric, Nitri...
Article
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Strategies to mitigate climate change have been developing and applying in the productive sector. Carbon capture and storage technologies might decrease the impact of CO2 emissions on the environment. Biological technologies are an important tool to mitigate CO2 emissions and microalgae cultivation emerges as a promising alternative, due to the imp...
Article
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To improve vehicles environmental performance, different strategies have been explored namely to reduce the use stage energy. In order to avoid problem shifting, a life cycle perspective should be used to compare alternative solutions. This paper aims to compare existing studies focused on life cycle energy (LCE) of vehicles to analyze the impacts...
Article
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Energy challenges are crucial issues to achieve Sustainable Development and its goals. Energy availability and affordability are pillars for ending poverty, giving access to commodities as well as water, etc. Modern lives rely on appliances and gadgets based on electric energy being its price a key issue making it worth to analyze and promote simpl...
Article
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The World pandemic situation that started in 2020 brought important limitations to live events. In spite of the fast response provided by the scientific community, with researchers from all over the World committed to the development of vaccines to prevent the dissemination and effects of the corona virus, in 2021 it was not yet possible to organiz...
Article
Ennoblement of carbon dioxide, particularly the one produced by anaerobic digestion or by biomass combustion, is a motivation to develop novel or improving already existing processes. In this context, an interesting idea is to use carbon dioxide combined together with methane and water. Therefore, bi-reforming of methane (BRM) for syngas production...
Article
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The huge demand for energy and products, mostly based on fossil fuels, have caused severe environmental impacts, that are based on pollution, greenhouse gas (GHG) emissions, and finally of climate changes. While energy can be supplied from different renewable sources, such as solar, wind or hydro energy, they are intrinsically impossible or hard to...
Article
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Urban waste production is increasing around the world. In the present Covid-19 context, an emergent flow of waste growth, as well as of pollution in general, stems from confinement and the use of protective masks. Although part of the waste is considered commingled, much is recyclable, if properly disposed off. Hence, recycling plays today, more th...
Article
Chlorella zofingiensis has been in the center of attention due to its viability of cultivation, capability to yield various products, and applicability in various industrial sectors. Several research studies have evaluated this microalga as a bio-factory for carotenoids and lipids production, which are interesting compounds for industrial applicati...
Article
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Adding value to agro-industrial residues is becoming increasingly important, satisfying needs to promote resources’ use efficiency and a more sustainable and circular economy. This work performs a parametric and kinetic study of enzymatic esterification of lard and tallow with high acidity, obtained by the rendering of slaughter by-products, allowi...
Conference Paper
Full-text available
Urban waste production is increasing around the world. In the present Covid-19 context, an emergent flow of waste growth, as well as of pollution in general, stems from confinement and the use of protective masks. Although part of the waste is considered commingled, much is recyclable, if properly disposed off. Hence, recycling plays today, more th...
Article
Full-text available
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 an...
Article
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The saccharification of sugarcane bagasse by enzymatic hydrolysis is one of the most promising processes for obtaining fermentable sugar to be used in the production of second-generation ethanol. The objective of this work was to study the immobilization and stabilization of two commercial enzymes: Endocellulase (E-CELBA) in dextran coated iron oxi...
Article
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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 compo...
Article
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Phycocyanin is a light-blue water-soluble natural pigment with wide application in fields including pharmaceutical, cosmetic and food industry. Arthrospira platensis is considered a natural bio-factory for obtaining phycocyanin, and although suitable cultivation conditions can enhance the pigment content, the importance of extraction and purificati...
Article
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The 7th International Conference on Energy and Environment Research (ICEER 2020) followed six previous successful editions hosted in three European Countries (Portugal, Spain, Czech Republic). This last edition was planned to be held in Italy first, and then in Portugal, due to the pandemic situation. Finally, for safety reasons, it was decided to...
Article
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Industrial production and commercialization of biodiesel from microalgae have become a good alternative to conventional feedstock. Microalgae show high growth rate and carbon sequestration and can be easily cultivate in fresh and/or marine water, using non-arable soil. This study aims to analyze the technical and economic feasibility of biodiesel p...
Article
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Fat from fleshings is an excellent source of energy since it is composed of glycerides, fatty acids and glycerol. The present work aims to optimize the operating conditions of fat extraction from fleshings. Animal fat was obtained after thermal treatment of fleshings in a stainless steel batch reactor using different operating conditions (100≤T≤155...
Article
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The objective of this work was to find the ideal pretreatment conditions with high efficiency to obtain a hydrolyzate rich in fermentable sugars and low possible inhibitors levels. Thus, it was applied diluted phosphoric acid to pretreat the sugarcane biomass. Through a Central Composite Design, it was evaluated the influence of temperature, operat...
Article
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 developmen...
Article
Full-text available
Correction for ‘Syngas production by bi-reforming methane on an Ni–K-promoted catalyst using hydrotalcites and filamentous carbon as a support material’ by Adelino F. Cunha et al. , RSC Adv. , 2020, 10 , 21158–21173, DOI: 10.1039/D0RA03264F.
Article
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Steam reforming of methane (SRM) and dry reforming of methane (DRM) are frequently used in the production of syngas; however, the bi-reforming of methane (BRM) is an interesting and alternative process. In this study, BRM was studied over MgO, a layered double hydroxide (LDH) phase that was destroyed between 600 °C and 900 °C during the reaction. I...
Article
In either unicellular or multi-cellular form, microalgae are photosynthetic microorganisms, mainly known for being part of the human diet in several world regions. More recently, they have been in the spotlight of researchers, not only because of their nutritional value, but also due to their high value-added components. This work reviews five micr...
Article
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 (LCA) of the industrial production of microalgal biodiesel, using an autochthonous Chilean Phaeodactylum tricornutum strain, considering 1 MJ of biodiesel as...
Article
Full-text available
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,...
Article
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 con...
Article
Full-text available
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...
Article
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Inefficient use of water represents a major source of direct cost of water production, but especially of excessive energy use to purify it. Greater efficiency could be achieved if management were supported by objective data in addition to the rules of good practice that have been disseminated. This work aims to contribute directly to the reduction...
Article
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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 cr...
Article
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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 pro...
Article
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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 m...
Article
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The 6th edition of the International Conference on Energy and Environment Research, ICEER 2019, took place in the end of July 2019, at the University of Aveiro, Portugal. With most of the participants coming from academia, and a few from the professional field, ICEER series is still growing and attracting increased interest. Energy production, dist...
Article
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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...
Article
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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...
Article
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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,...
Article
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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...
Conference Paper
Linking the economic, social and environmental aspects of any plan, project or activity is fundamental to act according to the sustainable development goals. These three dimensions are interrelated and interconnected in such a way that it is sometimes very hard to discriminate what their individual effects are, or on the contrary, how their joint e...
Article
Full-text available
Similar to oil, biological origin feedstock can be converted into a number of products allowing to recover the maximum value from the raw biological material, within what is nowadays called a biorefinery. Among other biological materials, microalgae are a very interesting biomass due to the high economic value of certain cellular components, such a...
Article
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 emp...
Article
Full-text available
The environmental impacts associated with the burning of fossil fuels coupled with growing concerns about security of energy supply, motivated the search for more sustainable forms of energy production, among which came microalgae for biofuels production. However, the commercial production of microalgae biofuels is still not competitive compared to...
Article
The growing concern about decarbonization of the energy production system led to the use of Renewable Energy Sources (RES). However, RES has the drawback of being inherently intermittent and lack controllability, placing limitations on their use. To avoid such limitations, the exploitation of a wide range of energy storage strategies that allow the...
Article
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The use of fossil fuels as the main source of energy for most countries has caused several negative environmental impacts, such as global warming and air pollution. Air pollution causes many health problems, causing social and economic negative effects. Worldwide efforts are being made to avoid global warming consequences through the establishment...
Conference Paper
The production of synthetic gasoline and diesel fuel comes from reforming of either natural gas, biogas and LPG. [1,2]. Although this concept has many environmental and economic motivations, today it is not enforced in large plants. This study illustrates the potential of reforming of methane or propane for industrial applications by producing synt...
Article
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The treatment of nitrogen-deficient agriculture wastewater, arising from the vegetable and fruit processing, is a significant problem that limits the efficiency of its biological treatment. This study evaluates the effectiveness of the symbiotic co-culture of Azospirillum brasilense and Scenedesmus sp., under two nitrogen levels (8.23 mg L−1 and 41...
Chapter
Biodiesel is a renewable fuel, produced from waste cooking oils, animal fats, vegetable and algae oils. Its use is intended to replace diesel in conventional diesel engines, causing lower polluting emissions. To produce biodiesel, certain details must be carefully considered, namely feedstock composition, reaction parameters, process conditions, pr...
Article
Full-text available
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 w...
Article
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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 cycl...
Poster
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The harvesting of solar energy has increased the demand for efficient, durable and flexible storage technologies that are also environmentally sustainable. Vanadium Redox Flow Batteries (VRFB) are one of the most promising technologies in stationary storage systems due to their long charge-discharge cycles, high efficiencies and avoided cross-conta...
Conference Paper
Full-text available
Buildings are now complex systems that traditionally have been studied in an isolated mode, seeking to respond to a specific need and dealing with a restricted set of variables. The targets established for energy efficient buildings and energy sustainability imply that these new systems are now more comprehensive and combine various independent sys...
Conference Paper
Sustainable development has been linked to the ecological, economic and social dimensions, and it appears from the outset that it is a complex task to include several very different aspects while planning and projecting. This multi-dimensional feature migrates to education sustainable development that is, as expected, a complex task. Traditional ed...
Poster
Full-text available
In this work, a life cycle assessment of a Vanadium Redox Flow Battery is performed on a cradle-to-gate approach. The ILCD 2011 Midpoint+ method was used to estimate the potential environmental impacts. The results show that the environmental hotspots lie mostly in the battery’s structural components and materials, in particular the vanadium electr...
Article
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The European Commission has been developing efforts resulting in directives and programs to stimulate water saving. The lack of information about water usage in public bathing facilities is an obstacle to achieve an adequate management. This work proposes a monitoring system able to observe individual water consumption in public bathing facilities....
Article
Full-text available
The 5th edition of the International Conference on Energy and Environment Research, ICEER 2018, took place in the end of July. The maturity of this conference series has now been reached, with a large number of participants from academia, as well as a few coming from the professional field. Linking together energy and environment research is not an...
Article
Full-text available
This work evaluates the embodied carbon and energy of an industrial building construction with 6733 m² of built area, following a LCA methodology, on a gate-to-gate approach. For the LCI it was used primary data of electricity, water and diesel fuel, directly measured at the construction site, and information about the building materials used in th...