Maria Isabel Nunes

Maria Isabel Nunes
University of Aveiro | UA · Centre for Environmental and Marine Studies (CESAM)

PhD

About

50
Publications
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890
Citations

Publications

Publications (50)
Article
This work reviewed the application of life cycle assessment (LCA) to the treatment of wastewaters by Fenton processes. The goal was to identify the major environmental hotspots of the different Fenton processes-conventional homogeneous, intensified homogeneous, and heterogeneous-and assess how LCA can contribute to help industries select the most s...
Article
The raw materials for the tanning industry, namely hides and skins, are preserved (curing stage) and carried with common salt, i.e., sodium chloride (NaCl). Proceeding to conversion into leather, pickling is a key stage of the tannery process, which entails high demand of water and salt. In this work, the salt-derived brine (SdB) generated from the...
Article
The work describes the combination of granulated biomass fly ash (GBFA) with Fenton process to enhance the removal of adsorbable organic halides (AOX) from pulp bleaching wastewater. At optimal operating conditions, wastewater's chemical and biochemical oxygen demand (COD and BOD5, respectively) and colour was also quantified, and operating cost of...
Article
In this work, the performance of residual iron dust (RID) from metallurgic industry was assessed as Fenton catalyst for the treatment of real pulp bleaching wastewater. The focus was on the removal of recalcitrant pollutants AOX (adsorbable organic halides), by a novel, cleaner, and cost-effective circular solution based on a waste-derived catalyst...
Article
Full-text available
This work aimed to test and optimise reactive Planar Laser-Induced Fluorescence (PLIF) methods for the visualisation of the micromixing regions in chemical reactors using standard PLIF and Particle Image Velocimetry (PIV) equipment with the laser source 512 nm. Two methods were tested: (i) an acid–base reaction with fluorescein as the reaction-sens...
Article
This work studied the incorporation of Co²⁺, Cu²⁺, and Mn²⁺ as Fenton co-catalysts, seeking synergetic effect that could allow for overall reduction of chemical demand. Focus was on removing recalcitrant pollutants AOX from pulp bleaching wastewater, but side effect on wastewater COD and colour was also assessed, and operating cost of treatment was...
Article
The present work is framed in the methods and techniques of disaster risk assessment and management used in various territorial contexts to understand the social, natural and socio-natural processes that determine the risk of the occurrence of a disaster. This work aims to apply the methodologies of the Oregon Emergency Management of the United Sta...
Article
Hydrogen sulfide (H2S) emissions from municipal solid waste (MSW) management facilities have been linked to odor nuisance and human health effects both for workers and people living in the surrounding areas. Two field campaigns were conducted to characterize H2S concentrations in the ambient air of MSW management facilities in Portugal: a mechanica...
Article
Circularity in the resources usage is one of the current challenges in the development of our civilization. At the same time, there is an imperative need for cleaner and competitive energy sources, alternatives to those of fossil origin. In this context, the present work aimed to optimize a continuous process for fatty acid methyl esters (FAME) pro...
Article
This study reviews the recent developments in the application of Fenton processes in real industrial wastewater treatment, focusing on heterogeneous catalysts and catalyst regeneration/reuse. This article presents the features, inherent advantages or drawbacks, and primary experimental results obtained on established and emerging Fenton processes,...
Article
One of the problems associated with biomass combustion is the amount of fly ashes generated and its subsequent management. The search for ways of valorizing these ashes has been a challenge for the academic and industrial community. On the other hand, used cooking oils are wastes which management is quite difficult, by they have a very important en...
Article
AOX emissions to water are a key environmental aspect in the pulp and paper industry being limited by EU Ecolabel criteria. In this work, response surface methodology was used to optimise Fenton and photo-Fenton processes for AOX removal from a kraft pulp mill bleaching wastewater. Focus on the specific stream where AOX is higher reduces the wastew...
Article
Full-text available
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
Full-text available
This work aimed to: (i) assess the performance of Novozyme® 435 for FAME production from waste cooking oil (WCO) under different oil acid values and enzyme-to-oil ratios; (ii) test different regeneration methods and assess the regenerated enzyme’s performance; and (iii) determine FAME yield in continuous operation regime. Oil acid values up to 104...
Article
Full-text available
D0bleaching wastewater from E. globulus Kraft pulping industry was treated by Fenton and photo-Fenton processes. The aim was to optimize the operational conditions for adsorbable organic halides (AOX) removal, namely oxidant concentration, [H2O2], catalyst concentration, [Fe2+], and treatment time, using the central composite experimental design (C...
Article
Full-text available
In the worldwide more than 95% of biodiesel production feedstocks come from edible oils. The waste cooking oils (WCO) are an alternative feedstock for biodiesel production; its usage reduces significantly the cost of biodiesel production and has environmental benefits, e.g., a waste recovery instead of its elimination. This work aimed to optimize t...
Article
More than 95% of biodiesel production feedstocks come from edible oils, however it may cause some problems such as the competition of land use between food production and biodiesel production. The waste cooking oils (WCO) are an alternative feedstock for biodiesel production; its usage reduces significantly the cost of biodiesel production and has...
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...
Conference Paper
This work aimed to study and improve two test reactions used in some mixing studies, based on optical methods of quantification. The test reactions were: an acid-base reaction with uranine as a fluorophore, and Fenton reaction, with quenching of Rhodamine-B's emission as probe for reaction recording. Laboratory tests were conducted in a stopped-flo...
Article
Full-text available
Unfortunately, the name of the third author was incorrectly captured in the published online paper.
Article
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Climate change has been causing the increase in frequency, severity, and duration of harmful algal blooms, which makes the establishment of water management strategies indispensable. For cyanobacteria, several methods are currently used in monitoring programs. However, these methods are time-consuming and require specialists, and results are usuall...
Article
Full-text available
An experimental study was conducted at field conditions in order to evaluate the effect of application of ash from biomass combustion on some soil fertility characteristics and plant growth. Application of 7.5 Mg ha(-1) industrial fly ash (IA), domestic ash (DA), and a 50:50 mix of domestic ash (DA) and spent coffee grounds (SCG) was made in differ...
Article
Full-text available
The growth kinetics of nanosized ZnO was studied considering the influence of different parameters (mixing degree, temperature, alcohol chain length, reactant concentration and Zn/OH ratios) on the synthesis reaction and modelling the outputs using typical kinetic growth models, which were then evaluated by means of a sensitivity analysis. The Zn/O...
Article
Full-text available
In vivo phycocyanin (PC) fluorescence allows assessing cyanobacterial abundance in an easy, fast and cost-effective way. However, the establishment of PC thresholds is necessary for its use in routine monitoring programmes and there has been no consensus regarding their definition. This work aimed: (1) to assess the potential species-specific varia...
Article
To assess micromixing in T-jet mixers, having various geometries and flow rates, a set of test reactions was employed. This consisted of the reactions between 1-naphthol/2-naphthol and diazotized sulfanilic acid in aqueous solution. The results showed that the Reynolds number has a large effect on the rate of mixing. Furthermore, the geometrical pa...
Article
Full-text available
Purpose In Portugal, the management of end-of-life vehicles (ELV) is set out in targets of the European Union policy for the year 2015, including 85 % recycling, 95 % recovery, and maximum of 5 % landfilling. These goals will be attained only through more efficient technologies for waste separation and recycling of shredder residues or higher rates...
Article
The influence of geometrical and design parameters of T-jets mixers on flow dynamics and mixing patterns is studied by means of two-dimensional computational fluid dynamics simulations, planar laser-induced fluorescence, and test chemical reactions. The ratios between injector width and mixing chamber width and between width and depth of the mixing...
Article
The product distribution of a fast chemical reaction system was used for the characterization of micromixing in T-jets mixers; several geometries were assessed under different operational conditions (Reynolds number and jets flow rate ratio). The micromixing test system was the reaction between 1-naphthol and diazotized sulfanilic acid in an aqueou...
Article
Full-text available
The simultaneous azo couplings of 1- and 2-naphthols with diazotized sulfanilic acid have been widely used to study the influence of mixing on the product distribution of fast chemical reactions with fluids of low viscosities. The aim of this work is to assess the micromixing performance of the mixing chamber of a RIM (Reaction Injection Molding) m...
Article
In a previous article (Laranjeira et al.), a network model was developed to describe and predict the behavior and performance of NETmix®, a new type of static mixer consisting of a network of interconnected chambers and channels. This work reports experimental results on a transparent prototype NETmix® unit constructed to enable the characterizatio...
Article
Tese de doutoramento. Engenharia Química. Faculdade de Engenharia. Universidade do Porto. 2007
Article
A novel control scheme for assessing mixing on reaction injection moulding is introduced and the results of its implementation are presented. The control scheme is based on the dynamic measurement of static pressure in the feeding lines to the mixing chamber injectors. The pressure signal oscillates with a frequency which allows assessing the flow...
Article
Dissertação apresentada para obtenção do grau de Mestre em Engenharia dos Processos Químicos, na Faculdade de Engenharia da Universidade do Porto, sob a oientação do Prof. Doutor José Carlos Brito Lopes

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