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Advisor(s)
Abstract(s)
Os biocombustíveis apresentam um interessante potencial de redução da dependência
energética relativamente aos combustíveis fósseis. A produção de microalgas apresenta
vários benefícios ambientais como sejam a utilização mais efetiva de terrenos, a captura de
dióxido de carbono, a purificação de águas quando associada a um processo de tratamento
de águas residuais e não provoca a disputa entre a produção de matéria-prima para
alimentação e combustíveis. A cultura de microalgas para a produção de biodiesel tem
recebido uma grande atenção nos últimos anos devido ao seu potencial. Neste trabalho
pretende-se criar as etapas de processamento das microalgas em biodiesel onde são
implementadas medidas de eficiência energética e aproveitamento de fontes poluidoras
como o CO2. Para isso, formulou-se um modelo no programa Aspen Plus para simulação
do processo desde a produção, colheita até à extração de óleo das microalgas e posterior
avaliação económica do mesmo. Concluiu-se que para o projeto fosse pago no tempo de
vida útil seria preciso vender o óleo a 13 $/kg. Aos preços atuais do óleo o projeto não é
economicamente viável.
Biofuels today present an interesting potential for reducing energy dependence on fossil fuels. They offer several environmental benefits, such as effective land utilization, CO2 sequestration, self-purification when coupled with waste-water treatment, and they also do not trigger opposition between food and fuel production. Microalgae cultivation for biodiesel production has received in the last years a lot of attention due to its potential. However, having all ‘theoretical’ advantages, a revision of the problems related with the energy balance is not being clearly addressed. This work aims to establish the steps of biodiesel production from microalgae where energy saving measures are implemented and taking advantage of polluting sources like CO2. For this purpose, a model was developed in Aspen Plus software for process simulation of the culture, followed by harvest and ending in oil extraction from microalgae and subsequent economic assessment. It was concluded in this work that the breakeven of the project was accomplished selling the oil at 13€/kg. At the present oil prices this project is not economically viable.
Biofuels today present an interesting potential for reducing energy dependence on fossil fuels. They offer several environmental benefits, such as effective land utilization, CO2 sequestration, self-purification when coupled with waste-water treatment, and they also do not trigger opposition between food and fuel production. Microalgae cultivation for biodiesel production has received in the last years a lot of attention due to its potential. However, having all ‘theoretical’ advantages, a revision of the problems related with the energy balance is not being clearly addressed. This work aims to establish the steps of biodiesel production from microalgae where energy saving measures are implemented and taking advantage of polluting sources like CO2. For this purpose, a model was developed in Aspen Plus software for process simulation of the culture, followed by harvest and ending in oil extraction from microalgae and subsequent economic assessment. It was concluded in this work that the breakeven of the project was accomplished selling the oil at 13€/kg. At the present oil prices this project is not economically viable.
Description
Keywords
Microalgas Biodiesel Simulação Aspen Plus Chlorella Vulgaris Óleo Microalgae Aspen Plus simulation Oil