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Made available in DSpace on 2021-06-25T10:46:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Cassava waste has the potential to be used as an energy source. The aim of this study was to analyze the effects of pressure densification on the properties of cassava residue briquettes, especially on the strength of the briquettes. It was used three compaction pressures: 102, 153, and 204 MP A and three pressing hold times: without holding pressure time, 60s, and 120 s, to produce briquettes without heating and verify their formation concerning the compaction. The proximate analysis provided 72.50% to volatile, 13.10% to Fixed carbon, and 14.45% to ash; the higher heating value (HHV) was 17.12 MJ/kg. The cassava rhizome waste (bulk density) showed an energy density of 2.04 GJ/m3. With densification, it obtained an energy density of 15.7 GJ/m3, representing an increase of up to 7.7 times. We obtained higher durability (94,1%) for time pressing of 120s and pressure of 204 MP A. The briquette volumetric stabilization occurred 24 h after production, and we observed that the briquettes produced with a higher compaction pressure showed greater density and resistance. Cassava rhizome biomass showed good energy properties. The densification process can be an alternative to solving transportation, handling, and cassava rhizome residues. São Paulo State University (Unesp) Campus of Rosana Biomass Densification Laboratory Department of Energy Engineering, Av. Dos Barrageiros, 1881, Centro, Primavera/Rosana Federal University of São Carlos Biomass and Bioenergy Laboratory Department of Environmental Sciences, Rodovia João Leme Dos Santos, SP-264, Km 110 - Itinga São Paulo State University (Unesp) Campus of Rosana Biomass Densification Laboratory Department of Energy Engineering, Av. Dos Barrageiros, 1881, Centro, Primavera/Rosana FAPESP: #2018/11837–2 FAPESP: #2018/14827–8

The search for new alternatives in order to reuse residues is one way to minimize environmental impacts by promoting sustainable practices. This study analyzed the technical feasibility of briquettes production from urban pruning residue and sugarcane bagasse, turning them into a product with higher added value besides directing their use and reducing their improper disposal. Five treatments were studied from different ratios of the two residues: T1, T2, T3, T4 and T5, respectively made of 100% of urban pruning; 50% urban pruning and 50% sugarcane bagasse; 25% urban pruning and 75% sugarcane bagasse; 10% urban pruning and 90% sugarcane bagasse; 100% sugarcane bagasse. The materials were characterized physically, chemically and energetically. Briquettes were produced and evaluated for mechanical performance, with expansion tests, mechanical resistance and friability to verify the quality of the final product. The treatments 1 and 2 showed the best results, with lower friability and average values of mechanical resistance of 167.14 and 107.56 kgf, respectively. It is concluded that both residues (sugarcane bagasse and urban pruning) had potential for briquette production, as well as the mixture between both materials. RESUMO A busca de novas alternativas para reutilizar resíduos é uma maneira de minimizar impactos ambientais promovendo práticas sustentáveis. Este trabalho analisou a viabilidade técnica da produção de briquetes a partir de resíduos de poda urbana e bagaço de cana-de-açúcar, transformando-os em um produto com maior valor agregado, além de direcionar seu uso e reduzir a disposição inadequada. Foram estudados cinco tratamentos a partir de diferentes proporções dos dois resíduos: sendo T1, T2, T3, T4 e T5, respectivamente, 100% de resíduo de poda urbana; 50% de resíduo de poda urbana e 50% de bagaço de cana; 24% de resíduo de poda urbana e 75% de bagaço de cana; 10% de resíduo de poda urbana e 90% de bagaço de cana; e 100% de bagaço de cana. Os materiais foram caracterizados física, química e energeticamente. Foram produzidos briquetes e avaliados quanto ao desempenho mecânico, com testes de expansão, resistência mecânica e friabilidade para verificar a qualidade do produto final. Os tratamentos 1 e 2 apresentaram os melhores resultados, com menor friabilidade e valor médio de resistência mecânica de 167,14 e 107,56 kgf, respectivamente. Conclui-se que ambos os resíduos (bagaço de cana e poda urbana) apresentaram potencial para produção de briquete, bem como a mistura entre os dois materiais.

Reconstituted wood panels are widely used in various branches of the wood industry, such as in the furniture sectors and various segments of urban and rural construction. In Brazil, agricultural and forestry residues are abundantly generated, making feasible the study, development and application of alternative and sustainable materials, produced from the use of these wastes. The aim of this study was to produce high-density homogenous panels with wood residues of Pinus elliottii and oat hulls (Avena sativa), pressed with two types of adhesive, castor oil-based polyurethane and melamine formaldehyde, and to evaluate the physical performance of these panels. The physical performance of the panels was evaluated based on the ABNT NBR 14810: 2006, ANSI A208.1: 1999 and BS EN 312: 2003 standards. Analysis of variance (ANOVA) was performed to test the influence of the factors percentage of oat hull, percentage of adhesive and type of adhesive, and the interactions between these factors on the physical properties of the panels. The results indicated physical properties, in some treatments superior to the requirements stipulated by the consulted standards. It was concluded that the panels produced with the castor oil-based polyurethane adhesive showed better physical performance when compared with the panels produced with the melamine formaldehyde adhesive.