26 documents found, page 1 of 3
Upgrading of refuse derived fuel through torrefaction and carbonization: evalua...
Nobre, Catarina; Vilarinho, Cândida; Alves, Octávio; Mendes, Benilde; Gonçalves, MargaridaRefuse derived fuel (RDF) is produced in large amounts but its heterogeneous nature and low calorific value reduce the potential for energetic valorization of this material. In this work, the torrefaction and carbonization of RDF was studied in a temperature range of 200–400 °C and residence times from 15 to 60 min, yielding chars with increased density, high heating value (HHV), carbon content, ash content and...
Production of bio-hydrocarbons by hydrotreating of pomace oil
Pinto, Filomena; Varela, Francisco; Gonçalves, Maria Margarida; Andre, Rui N.; Costa, Paula; Mendes, BenildeOlive pomace oil is a by-product from the olive oil industry that is still being used in the food industry as a low value vegetable oil. Crude olive pomace oil needs to be refined and is blended with virgin olive oils before being used as edible oil. The detection of toxic compounds led to more restricted legislation and to the search of alternative valorisation processes, such as hydrotreating to obtain bio-hy...
Production of bio-hydrocarbons by hydrotreating of pomace oil
Pinto, Filomena; Varela, Francisco; Gonçalves, Maria Margarida; Andre, Rui N.; Costa, Paula; Mendes, BenildeOlive pomace oil is a by-product from the olive oil industry that is still being used in the food industry as a low value vegetable oil. Crude olive pomace oil needs to be refined and is blended with virgin olive oils before being used as edible oil. The detection of toxic compounds led to more restricted legislation and to the search of alternative valorisation processes, such as hydrotreating to obtain bio-hy...
Leaching behaviour and ecotoxicity evaluation of chars from the pyrolysis of fo...
Bernardo, Maria; Mendes, S.; Lapa, Nuno; Gonçalves, Maria Margarida; Mendes, Benilde; Pinto, Filomena; Lopes, HelenaThe main objective of this study was to assess the environmental risk of chars derived from the pyrolysis of mixtures of pine, plastics, and scrap tires, by studying their leaching potential and ecotoxicity. Relationships between chemical composition and ecotoxicity were established to identify contaminants responsible for toxicity. Since metallic contaminants were the focus of the present study, an EDTA washin...
Biomass fly ashes as low-cost chemical agents for Pb removal from synthetic and...
Barbosa, Rui; Lapa, Nuno; Lopes, Helena; Gunther, Annika; Dias, Diogo; Mendes, BenildeThe main aim of this work was to study the removal efficiency of Pb from synthetic and industrial wastewaters by using biomass fly ashes. The biomass fly ashes were produced in a biomass boiler of a pulp and paper industry. Three concentrations of Pb2+ were tested in the synthetic wastewater (1, 10 and 1000 mg Pb/L). Moreover, two different wastewaters were collected in an industrial wastewater treatment plant ...
Hydrogenation of rapeseed oil for production of liquid bio-chemicals
Pinto, Filomena; Martins, Susana; Gonçalves, Maria Margarida; Costa, Paula; Gulyurtlu, Ibrahim; Alves, Andreia; Mendes, BenildeThe main objective of rapeseed oil hydrogenation tests was the production of liquid bio-chemicals to be used as renewable raw material for the production of several chemicals and in chemical synthesis to substitute petroleum derived stuff. As, hydrogenation of vegetable oils is already applied for the production of biofuels, the work done focused in producing aromatic compounds, due to their economic value. The...
Hydrogenation of rapeseed oil for production of liquid bio-chemicals
Pinto, Filomena; Martins, Susana; Gonçalves, Maria Margarida; Costa, Paula; Gulyurtlu, Ibrahim; Alves, Andreia; Mendes, BenildeThe main objective of rapeseed oil hydrogenation tests was the production of liquid bio-chemicals to be used as renewable raw material for the production of several chemicals and in chemical synthesis to substitute petroleum derived stuff. As, hydrogenation of vegetable oils is already applied for the production of biofuels, the work done focused in producing aromatic compounds, due to their economic value. The...
Sorption of lead (Pb2+) from aqueous solutions using chars obtained in the pyro...
Bernardo, Maria; Mendes, S.; Lapa, Nuno; Gonçalves, Maria Margarida; Mendes, Benilde; Pinto, Filomena; Fonseca, Isabel MariaCarbonaceous solid products resulting from thermochemical processes (pyrolysis, gasification), commonly known as chars, are emerging as low-cost sorbents of metallic contaminants, being their effectiveness already demonstrated in several studies (Inyang et al., 2012; Fuente-Cuesta et al., 2012; Ko³odyñska et al., 2012; Quek and Balasubramanian, 2009; Devecia and Kar, 2013). Given the fact that the commercial vi...
Própolis: um "medicamento" fabricado pelas abelhas?
Alves, Andreia; Lopes, Ana Catarina; Gonçalves, Margarida; Duarte, Paula; Figueiredo, Paulo; Mendes, BenildeO própolis é um produto escuro e pegajoso, fabricado pelas abelhas a partir de materiais vegetais resinosos e a partir de fluido segregado pelas próprias abelhas. As propriedades antioxidantes, antimicrobianas e antimutagénicas do própolis são frequentemente referidas na chamada medicina popular, mas a sua capacidade de reforço do sistema imunitário é talvez a propriedade mais explorada comercialmente em formul...
Fruit and honey yogurts: sources of antioxidant compounds
Marletta, Agustín; Tavares, Ana Catarina; Alves, Andreia; Gonçalves, Margarida; Figueiredo, Paulo; Mendes, BenildeYogurt is a functional food mainly known by its prebiotic and probiotic properties. On the other hand, the addition of fruit rich jams or honey to yogurts has been widely used to improve the organoleptic and nutritional value of this food product. These components also allow obtaining a different range of products that can gain the consumer preference. Fruits and honey are themselves functional products rich in...