• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Fermenta??o alco?lica utilizando l?quido da casca de coco verde como fonte de nutrientes / Fermenta??o alco?lica utilizando l?quido da casca de coco verde como fonte de nutrientes

Teixeira, Renata Beltr?o 15 June 2007 (has links)
Made available in DSpace on 2014-12-17T15:01:12Z (GMT). No. of bitstreams: 1 RenataBT.pdf: 1220401 bytes, checksum: a52c88053d4d3cde9e007821b799d056 (MD5) Previous issue date: 2007-06-15 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The liquid of the rind of green coconut (LCCV), an effluent stream from the industrial processing of green coconut rind, is rich in sugars and is a suitable feedstock for fermentation. The first step of this study was to evaluate the potential of natural fermentation of LCCV. As the literature did not provide any information about LCCV and due to the difficulty of working with such an organic effluent, the second step was to characterize the LCCV and to develop a synthetic medium to explore its potential as a bioprocess diluent. The third step was to evaluate the influence of initial condensed and hydrolysable tannins on alcoholic fermentation. The last step of this work was divided into several stages: in particular to evaluate (1) the influence of the inoculum, temperature and agitation on the fermentation process, (2) the carbon source and the use of LCCV as diluent, (3) the differences between natural and synthetic fermentation of LCCV, in order to determine the best process conditions. Characterization of LCCV included analyses of the physico-chemical properties as well as the content of DQO, DBO and series of solids. Fermentation was carried out in bench-scale bioreactors using Saccharomyces cerevisiae as inoculum, at a working volume of 5L and using 0.30% of soy oil as antifoam. During fermentations, the effects of different initial sugars concentrations (10 - 20%), yeast concentrations (5 and 7.5%), temperatures (30 - 50?C) and agitation rates (400 and 500 rpm) on pH/sugars profiles and ethanol production were evaluated. The characterization of LCCV demonstrated the complexity and variability of the liquid. The best conditions for ethanol conversion were (1) media containing 15% of sugar; (2) 7.5% yeast inoculum; (3) temperature set point of 40?C and (4) an agitation rate of 500 rpm, which resulted in an ethanol conversion rate of 98% after 6 hours of process. A statistical comparison of results from natural and synthetic fermentation of LCCV showed that both processes are similar / A utiliza??o do l?quido da casca de coco verde (LCCV) em fermenta??o surgiu como uma alternativa ao aproveitamento de um efluente, rico em a??cares ferment?veis, liberado pelas usinas de beneficiamento da casca de coco verde. A primeira fase deste trabalho foi avaliar o potencial fermentativo do l?quido da casca de coco verde atrav?s da fermenta??o natural do l?quido. Por n?o possuir informa??o dispon?vel na literatura e pela dificuldade de se trabalhar com um efluente org?nico, a segunda fase foi realizar a caracteriza??o do l?quido e a elabora??o de um meio sint?tico, para melhor explorar seu potencial como diluente em bioprocessos. A terceira fase, estudar a influ?ncia de taninos iniciais condensados e hidrolis?veis em fermenta??o alco?lica. A ?ltima fase foi dividida em tr?s etapas, na qual se avaliou a influ?ncia da quantidade de in?culo no processo fermentativo; a influ?ncia da fonte de carbono e do uso de LCCV como diluente; a temperatura; a agita??o e, finalmente, o estudo comparativo entre o LCCV in natura e sint?tico, nas condi??es ?timas de processo. Para a caracteriza??o foram realizadas an?lises f?sico-qu?micas do LCCV, bem como os teores de DQO, DBO e s?rie de s?lidos. As fermenta??es foram realizadas em biorreator de bancada, com volume de trabalho de 5L, Saccharomyces cerevisiae e 0,30% de ?leo de soja como antiespumante. Nas fermenta??es foram avaliadas diferentes concentra??es de a??cares iniciais (10 a 20%) e de levedura (5 e 7,5%), e diferentes temperaturas (30 a 50?C) e agita??es (400 e 500rpm). Durante o processo foram analisados o perfil de pH e de a??cares, e a produ??o de etanol. A caracteriza??o do LCCV demonstrou a complexidade e variabilidade do l?quido. As melhores condi??es foram alcan?adas nos meios contendo 7,5% de levedura, 15% de a??cares, 40?C, sob agita??o de 500rpm, sendo obtida uma efici?ncia de convers?o em etanol de 98% ap?s 6 horas de processo. Durante o estudo comparativo do LCCV in natura e sint?tico, atrav?s dos par?metros avaliados durante a fermenta??o, um estudo estat?stico revelou a similaridade do meio sint?tico com o meio natural

Page generated in 0.0795 seconds