The production of an alternative form of fuel that replaces fossil fuels has been increasingly studied due to the environmental impacts generated by its excessive use, as well as the depletion of these fossil energy sources. Ethanol obtained from the crushing of sugar cane has been used as a substitute for these fuels, mainly in the automotive area. However, alternative sources are being studied to produce the so called second generation bioethanol. This would avoid competition for food producing agricultural areas and agroindustrial waste is a great source for obtaining it. In general, these residues are not always completely reused and are disposed of inappropriately in the environment, becoming contaminants. Therefore, the use of agroindustrial waste can become a renewable source of energy, in addition to reducing environmental impacts. The objective of this work is to produce second generation bioethanol as an alternative to the one currently used, using the rice husk hydrolyzate by the consortium formed by Saccharomyces cerevisiae and Pachysolen tannophilus. For this, an acid hydrolysis was performed with 2% sulfuric acid during 10 minutes of heating in an autoclave, after which the hydrolyzate was detoxified with the use of activated carbon. The crude and detoxified hydrolysates were used as a substrate for the fermentation medium with an initial concentration of 50 mg/mL of reducing sugars. The fermentation process with the use of both yeasts in the crude hydrolyzate medium, in the detoxified medium and in a synthetic medium composed of glucose, was carried out for 24 h, 30º C, 0 rpm and pH 6.5. The best results for the ethanol production of Saccharomyces cerevisiae was the synthetic medium with 20.6 mg/mL. For the yeast Pachysolen tannophilus, its highest production was in a synthetic medium with 11.67 mg/mL. The intercropping of the two yeasts proved to be efficient with a greater ethanol production reaching 21.5 mg/mL, the hydrolyzed and detoxified media showed great potential for ethanol production both in intercropping and in monoculture.
The production of an alternative form of fuel that replaces fossil fuels has been increasingly studied due to the environmental impacts generated by its excessive use, as well as the depletion of these fossil energy sources. Ethanol obtained from the crushing of sugar cane has been used as a substitute for these fuels, mainly in the automotive area. However, alternative sources are being studied to produce the so called second generation bioethanol. This would avoid competition for food producing agricultural areas and agroindustrial waste is a great source for obtaining it. In general, these residues are not always completely reused and are disposed of inappropriately in the environment, becoming contaminants. Therefore, the use of agroindustrial waste can become a renewable source of energy, in addition to reducing environmental impacts. The objective of this work is to produce second generation bioethanol as an alternative to the one currently used, using the rice husk hydrolyzate by the consortium formed by Saccharomyces cerevisiae and Pachysolen tannophilus . For this, an acid hydrolysis was performed with 2% sulfuric acid during 10 minutes of heating in an autoclave, after which the hydrolyzate was detoxified with the use of activated carbon. The crude and detoxified hydrolysates were used as a substrate for the fermentation medium with an initial concentration of 50 mg/mL of reducing sugars. The fermentation process with the use of both yeasts in the crude hydrolyzate medium, in the detoxified medium and in a synthetic medium composed of glucose, was carried out for 24 h, 30º C, 0 rpm and pH 6.5.The best results for the ethanol production of Saccharomyces cerevisiae was the synthetic medium with 20.6 mg/mL. For the yeast Pachysolen tannophilus , its highest production was in a synthetic medium with 11.67 mg/mL. The intercropping of the two yeasts proved to be efficient with a greater ethanol production reaching 21.5 mg/mL, the hydrolyzed and detoxified media showed great potential for ethanol production both in intercropping and in monoculture
Para execução dos ensaios, o efluente foi coletado na saída do decantador de uma indústria de parboilização de arroz localizada na região Noroeste do Paraná, sendo armazenado em galões plásticos e transportados para o Laboratório de Qualidade de Água do Campus do Arenito/UEM.
-MACRÓFITA AQUÁTICA UTILIZADA NOS EXPERIMENTOSA macrófita flutuante Pístia sp. (álface d'água) foi coletada em uma lagoa próxima ao Campus do Arenito/UEM e acondicionada em um reservatório com água e nutrientes (Figura 1) por um período de 30 dias, para promover a adaptação da planta. Após este tempo a planta foi utilizada nos ensaios.
A produção de embalagens oriundas de matérias primas sintéticas vem aumentando exponencialmente, com isso tem ocasionado graves problemas ambientais devido a alta longevidade desses materiais. Surge então a necessidade da substituição de produtos de origem sintética por produtos de fontes renováveis, e o desenvolvimento de novos produtos a partir de processos mais limpos de fabricação. Os nanocristais de celulose são materiais que tem chamado atenção de pesquisadores, devido à suas características físicas e químicas e sua aplicação como reforço em outras matrizes poliméricas. Neste contexto o objetivo deste trabalho foi a obtenção de nanocristais de celulose, a partir da palha do milho (Zea mays) e incorporação dos nanocristais em matrizes poliméricas de quitosana e proteína isolada de soja, com o intuito de traçar o melhor parâmetro a extração dos nanocristais e sua caracterização, como também a biodegradabilidade deste filmes. Observou-se que nos filmes de quitosana e SPI, não houve alteração no processo de degradação pelo processo de adição dos nanocristais em comparação com o controle, sugerindo que os nanocristais não interferem na biodegradabilidade das matrizes a qual são inseridos.
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