19 documents found, page 1 of 2
Production of sustainable aviation fuel precursors using the oleaginous yeast R...
Saraiva Lopes da Silva, Maria Teresa; Dutra, Francisca; Gomes, Miguel; Costa, Paula; Paradela, Filipe; Ferreira, Frederico CasteloABSTRACT: Sustainable aviation fuels (SAF) obtained from renewable sources of carbon can reduce carbon dioxide emissions and contribute for mitigating climate changes. In the present study, the yeast Rhodotorula toruloides PYCC 5615 was found to be highly promising for the bioconversion of eucalyptus bark hydrolysate and the accumulation of intracellular lipids which were further thermochemically processed to b...
Improving bio-oil fractions through fractional condensation of pyrolysis vapors...
Vilas-Boas, A.C.M.; Tarelho, L.; Marques, C.C.; Moura, J.M.O.; Santos, M.C.; Paradela, Filipe; Nunes, M.I.; Silvestre, A.J.D.ABSTRACT: Bio-oil produced from the pyrolysis of lignocellulosic biomass has potential as a biofuel or chemical precursor. However, its valorization is hindered by its complex composition, high water concentration, and the presence of oxygenated compounds. Operational strategies are therefore required to improve its quality. This study evaluated the technical feasibility of fractional condensation as an alterna...
Biofuel from wastewater-grown microalgae: A biorefinery approach using hydrothe...
Silva, Thiago; de Aguiar do Couto, Eduardo; Assemany, Paula; Costa, Paula; Marques, Paula; Paradela, Filipe; Reis, Alberto; Calijuri, Maria LuciaABSTRACT: Third-generation biofuels from microalgae are becoming necessary for sustainable energy. In this context, this study explores the hydrothermal liquefaction (HTL) of microalgae biomass grown in wastewater, consisting of 30% Chlorella vulgaris, 69% Tetradesmus obliquus, and 1% cyanobacteria Limnothrix planctonica, and the subsequent upgrading of the produced bio-oil. The novelty of the work lies in inte...
Streamlining the biodesulfurization process: development of an integrated conti...
Silva, Tiago; Paixão, Susana M.; Tavares, João; Paradela, Filipe; Crujeira, Teresa; Roseiro, J. Carlos; Alves, LuísABSTRACT: Biodesulfurization is a biotechnological process that uses microorganisms as biocatalysts to actively remove sulfur from fuels. It has the potential to be cleaner and more efficient than the current industrial process, however several bottlenecks have prevented its implementation. Additionally, most works propose models based on direct cultivation on fuel, or batch production of biocatalysts followed ...
Pressurized pyrolysis of mattress residue: An alternative to landfill management
Serrano, Daniel; Horvat, Alen; Mata, Ricardo M.; Costa, Paula; Paradela, FilipeABSTRACT: Mattresses are a difficult waste to manage in landfills due to their large volume and low density. Pyrolysis treatment could reduce its volume while producing fuel or products valuable for the chemical industry. Pressurized pyrolysis at 400, 450, and 500 degrees C is carried out in a lab-scale autoclave at initial pressures 4.2, 8.4, and 16.8 bar. Product gas yield increases slightly along with elevat...
Hydrothermal Co-Liquefaction of Food and Plastic Waste for Biocrude Production
Feuerbach, Silvan; Toor, Saqib Sohail; Costa, Paula; Paradela, Filipe; Marques, Paula; Castello, DanieleABSTRACT: In this study, hydrothermal co-liquefaction of restaurant waste for biocrude production was conducted. The feedstock was resembled using the organic fraction of restaurant waste and low-density polyethylene, polypropylene, polystyrene, and polyethylene terephthalate, four plastic types commonly present in municipal solid waste. Using design of experiment and a face-centered central composite design, t...
Slow pyrolysis of cork granules under nitrogen atmosphere: by-products characte...
Costa, Paula; Barreiros, M. Alexandra; Mouquinho, Ana; Silva, P. Oliveira e; Paradela, Filipe; Oliveira, Fernando Almeida CostaABSTRACT: Cork granules (Quercus suber L.) were slowly pyrolyzed at temperatures between 400-700 degrees C and under N-2 flow. While preserving its structure, some cells of the cork biochar became interconnected, allowing such carbon residue to be used as templates for manufacturing ceria redox materials. The pyrolytic char morphology was similar to that of the natural precursor. The produced cork biochar belon...
Production of liquid compounds by co-pyrolysis of different pre-treated biomass...
Pinto, Filomena; Duarte, Luís C.; Carvalheiro, Florbela; Paradela, Filipe; Costa, Paula; Marques, Joana; Andre, Rui N.; Marques, Paula; Costa, DiogoABSTRACT: As an innovation to conventional biomass pyrolysis to produce liquid biofuels, different types of biomass wastes were pre-treated by autohydrolysis, prior to pyrolysis. Eucalyptus forestry waste, corn cobs agricultural residue, and miscanthus (an energy crop) were autohydrolysed. Autohydrolysis led to valuable sugar-rich stream that may be used in fermentation and to solids rich in lignin that were py...
Production of liquid compounds by co-pyrolysis of different pre-treated biomass...
Pinto, Filomena; Duarte, Luís C.; Carvalheiro, Florbela; Paradela, Filipe; Costa, Paula; Marques, Joana; Andre, Rui N.; Marques, Paula; Costa, DiogoABSTRACT: As an innovation to conventional biomass pyrolysis to produce liquid biofuels, different types of biomass wastes were pre-treated by autohydrolysis, prior to pyrolysis. Eucalyptus forestry waste, corn cobs agricultural residue, and miscanthus (an energy crop) were autohydrolysed. Autohydrolysis led to valuable sugar-rich stream that may be used in fermentation and to solids rich in lignin that were py...
Effect of experimental conditions on co-pyrolysis of pre-treated eucalyptus ble...
Pinto, Filomena; Paradela, Filipe; Carvalheiro, Florbela; Duarte, Luís C.; Costa, Paula; Andre, Rui N.ABSTRACT: Eucalyptus has been largely used in the pulp and paper industry in Iberian Peninsula, due to its fast growth and high productivity. This eucalyptus utilisation has generated high amounts of wastes, including leaves, branches and stumps. Hence, these wastes were selected for the co-pyrolysis studies to produce liquid fuels or raw materials. As an alternative to the conventional biomass pyrolysis, bioma...