ORCID Profile
0000-0002-8901-3814
Current Organisation
James Cook University
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Publisher: Springer Science and Business Media LLC
Date: 09-2006
Publisher: Elsevier BV
Date: 12-2010
DOI: 10.1016/J.APRADISO.2010.06.001
Abstract: This study is focused on the analysis of an accumulation of inorganic elements in muscles, liver and gonad of seven fish species from São Francisco River located in the Paraná state of Brazil. Concentrations of the elements were determined using the SR-TXRF technique. In the muscles of fish species, negative length dependent relationships were observed for chromium and zinc ion absorption. The obtained results showed that accumulated Cr ions values are above the limits defined in the Brazilian legislative norm on food.
Publisher: FapUNIFESP (SciELO)
Date: 09-2005
Publisher: Springer Science and Business Media LLC
Date: 05-07-2015
Publisher: Wiley
Date: 10-03-2023
Abstract: Biodiesel is produced on a large scale as an eco‐friendly substitute and additive to fossil fuels. Catalytic homogeneous processes using strong acids, alkalis, and natural oils have been realized in industry. However, these traditional methods have several disadvantages, such as the generation of large volumes of waste, high water and reagent needs, use of hazardous reagents, high operation costs, and utilization of valuable feedstocks and catalysis, respectively. Different solutions have subsequently been investigated, such as cheap alternative feedstocks, co‐solvents and catalysts, sustainable operational conditions, advanced reactor designs and scales, and advantageous pre‐ and post‐reaction treatments. This review explores and analyzes the main aspects of current biodiesel technologies and opportunities. It also describes some advanced improvement strategies.
Publisher: Wiley
Date: 28-04-2022
Abstract: Methyl oleate, an ex le of a FAME (fatty acid methyl ester), was produced by oleic acid (OA) photoesterification with TiO 2 and UVA light. Different parameters were evaluated and optimised: catalyst pretreatment, temperature (25–65 °C), catalyst loading (1–30 % w/w OA ) and oleic acid : alcohol molar ratio (1 : 3–1 : 55). Response surface quadratic methodology obtained by central composite rotational design (RSM‐CCRD) was used to evaluate the main operational conditions of the photoesterification process. A high conversion of 98 % (±0.8) at 55 °C, 20 % TiO 2 (w/w OA ), and 1(OA) : 55(methanol) molar ratio was achieved. The photoesterification mechanism is furthermore proposed. The Langmuir‐Hinshelwood kinetic model considered the forward and backward reaction as first‐order fits with the best accuracy (R 2 of 0.997). The thermodynamic results (ΔG 338.15K =−20.75 kJ/mol, ΔH=13.75 kJ/mol, and ΔS=0.47 kJ/mol.K) indicate that the operating conditions are important, both to supply the energy requirement of the reaction, but also to increase the miscibility of the reactants.
Publisher: FapUNIFESP (SciELO)
Date: 12-2007
DOI: 10.1590/S0100-69162007000400007
Abstract: O objetivo do presente trabalho foi avaliar o potencial de reduções de emissão de carbono, em tCO2 eq ano-1, e estimar o valor financeiro obtido anualmente para o total de suínos da granja e o valor médio anual por animal em suinocultura, em sistema de recria e engorda, com capacidade instalada para 600 animais. O sistema de tratamento dos dejetos é realizado de forma integrada, possibilitando a reciclagem dos nutrientes, em que o biodigestor anaeróbio tubular estabiliza a matéria orgânica, produzindo metano e biofertilizante no processo. A estimativa foi efetuada baseando-se na metodologia AM0006, aprovada pelo Conselho Executivo do Mecanismo de Desenvolvimento Limpo do IPCC. O potencial de redução de emissão de CO2 equivalente por ano foi de 325,16 t, correspondendo à redução de emissão de 0,54 tCO2 eq animal-1 ano-1, e a possibilidade de ganho financeiro com a comercialização desses créditos de carbono de aproximadamente R$ 5,31 animal-1 ano-1.
No related grants have been discovered for Rosilene Andrea Welter.