Políticas ótimas de alimentação de substrato e enzima em reator de hidrólise operado em batelada alimentada: uma abordagem de controle ótimo com validação automatizada

• Autor(a) principal: Borges, Alex de Souza
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/10085
• topic: Fuzzy; Dosador; Controle ótimo; Biorreator; Hidrólise; Fuzzy; Feeder; Optimal control; Bioreactor; Hydrolysis; ENGENHARIAS::ENGENHARIA QUIMICA

The use of fossil fuels contributes to the increase in the amount of free carbon in the atmosphere, because most of the released carbon does not return to the Earth's surface, boosting the global temperature increase. Biofuels are a renewable and environmentally safe alternative, inasmuch as in its production depends that the carbon present in the atmosphere be captured through photosynthesis forming a cycle of production and consumption of carbon. The use of cellulosic leavings is a Muito promising alternative for the production of biofuels as 2G ethanol. The main reason is the fact that these leavings do not enter the competition "food vs fuels " what happens with 1G ethanol. For the consolidation of the industrial production of 2G bioethanol, the economic improvement of the process is necessary. For this reason, there are several researches that seek to make feasible the technique, in this project, a way is presented to improve the feeding of bioreactors, in order to increase the efficiency of cellulose hydrolysis by releasing reducing sugars, which could be converted into second generation alcohol. The use of fed-batch reactors reduces production costs and increases yields, enjoying of rational feed policies of substrates and biocatalysts. Then, this project intends to determine by means of a computational study, the optimized feeding profiles of cellulosic substrate and fed batch enzyme. For this, a semi- mechanistic model is developed, and the optimal control theory for the development of feed profiles is used. For the application of the feed profiles, a system was designed and built, able to automate the feed for both bioreactors and reactors, which alBaixo s to operate with different feeding profiles. The prototype used 3D printing technology to manufacture the mechanical devices, the entire control is done by two microcontrollers in half duplex network, in charge of acting on a helical conveyor. Due to the ability to work with nonlinear systems, the fuzzy nebulous logic was established as the base of the system, being responsible for carrying out the operations necessary to keep the feeder fully operational.