43 documents found, page 1 of 5
Forest waste composting—operational management, environmental impacts, and appl...
Ferreira Silva, Maria Elisabete; Saetta, Raffaella; Raimondo, Roberta; Costa, José Manuel; Ferreira, José; Brás, IsabelIn Portugal, the number of fres and the size of burnt areas are rising dramatically every year, increasing with improper management of agroforestry wastes (AFRs). This work aims to study the composting of these wastes with minimal operational costs and understand the environmental impact and the compost application on burnt soil. Thus, a study of life cycle assessment (LCA) was carried out based on windrow comp...
Influence of Different Agro-Food Waste on Ammonia and Greenhouse Gas Emissions ...
Pereira, José; Costa, Telma; Figueiredo, Vítor; Marques, Francisco; Perdigão, Adelaide; Brás, Isabel; Ferreira Silva, Maria ElisabeteComposting is one of the best organic waste management techniques, with zero waste; however, it generates environmental impacts. The objective of this study was to evaluate the emission of NH3, N2O, CO2, and CH4 from the composting of olive, elderberry, and grape agro-food waste. The experiment was carried out using reactors receiving straw as control and three treatments receiving mixtures of straw and olive, ...
Life Cycle Assessment of Green Space Irrigation Using Treated Wastewater: A Cas...
Santos, Lenise; Brás, Isabel; Ferreira, Miguel; Domingos, Idalina; Ferreira, JoséWater scarcity is a pressing issue that makes it essential to manage this resource efficiently and sustainably. One solution to combat this issue is the use of treated wastewater (TWW) to irrigate green spaces in cities. However, it is crucial to evaluate the environmental impacts associated with this practice. To this end, life cycle assessment (LCA) is the most advanced tool available. The objective of this s...
Risk assessment of reusing treated water from the Viseu Sul WWTP for irrigation...
Santos, Lenise; Ferreira, José; Silva, Maria; Simões, Luis; Ferreira, Miguel; Brás, IsabelDue to the growing water scarcity, the reuse of treated wastewater arises as a possibility for sustainable water management. However, it is necessary to evaluate the possible risks associated with its activity. This study aims to develop a risk assessment of water for reuse, in terms of public health and water resources, for production and internal use by the Viseu Sul Wastewater Treatment Plant (WWTP) and exte...
Valorisation of Forest and Agriculture Residual Biomass—The Application of Life...
Brás, Isabel; Ferreira Silva, Maria Elisabete; Raimondo, Roberta; Saetta, Raffaella; Mignano, Vincenzo; Fabbricino, Massimiliano; Ferreira, JoséThe treatment of agricultural and forest residues (AFRs) has become an important issue nowadays, both to avoid improper management and for their enhancement. In the study area of Viseu (Portugal), the AFRs are taken to a Residual Biomass Collection Centre. These are valorised in a Biomass Power Plant to produce electricity. Two further processes could be implemented to valorise this biomass: mulching and compos...
Local waste agroforestry managment - biomass to energy analysis with LCA
Brás, Isabel; Ferreira Silva, Maria Elisabete; Ferreira, José; Raimondo, Roberta; Saetta, Rafaella; Fabricino, MassimilainoTo enable the protection of forests against rural fires are foreseen a set of measures for plan-ning and intervention, reduction their risk and impacts. Forest residues collecting centers are being created in Portugal, to reduce undesired thermal charge in nature and for biomass further valorization. Keeping this in mind, one of the strategies is the energy recovery from these residues in bi-omass power plants ...
An approach to the stability of reset switched systems using dynamics without r...
Carapito, Ana C.; Brás, Isabel; Rocha, PaulaIn this paper, we consider switched linear systems that have jumps in the state (determined by a reset rule) at each switching instant. Those systems are called switched systems with state reset. We show that it is possible to analyze the state trajectories of a switched system with state reset by considering suitable switched systems without state resets, i.e., with continuous state trajectories. We establish ...
Carbon footprint of tourism sector in Portugal: Calculator self-validation
Fernandes, Marco; Neves, Pedro; Araújo, Patricia; Brás, Isabel; Silva, Maria Elisabete FereiraIn this work, a Carbon Footprint (CF) calculator developed to the tourism sector in Portugal, was validated. The CF calculator self-validation was based on the comparison of the results obtained with two tools available online (Carbon Footprint Ltd-CFL and Climate Care-CC) and with a Life Cycle Assessment (LCA) performed using the SimaPro PhD software. The calculator is based in the CO2e emissions of 6 componen...
2nd International Workshop: Zero Pollution – Make it Real
Cruz-Lopes, Luísa; Brás, Isabel; Silva, Maria; Rodrigues, Nuno; Lopes, SérgioThe large share of energy consumed at the industrial level is derived from fossil, nuclear and renewable sources. Fossil fuels are identified as one of the main sources of carbon emissions and cause of climate change. Global carbon dioxide (CO2) emissions from fossil fuels and industry have increased considerably since 2000, and in 2019 reached a record high of 36.7 billion metric tons of CO2. Environmental iss...
Selective collection of bio-waste in a non-intensive urban region – Producers’ ...
Brás, Isabel; Maia, S.; Simões, Luís; Rabaça, Teresa; Ferreira Silva, Maria ElisabeteThe European circular economy targets and waste policies have gradually focused on bio-waste, which is considered one of several key waste streams and is urgently needed to develop strategies for their selective collection. In non-intensive urban regions, a selective collection is a challenge due to the dispersion of bio-waste producers. This work intended to characterize the bio-waste producers, in Planalto Be...