Abstract
In recent years, algal bioethanol production comes into prominence as a trend towards sustainable development. Due to being sustainable energy source and environmental friendly, bioethanol production from algae is becoming increasingly popular all over the world. However, yield of bioethanol production from algae is lower than first generation feedstock's currently, and needs to be improved. In order to increase bioethanol yield, pre-treatments should be performed as cell disruption process on algal biomass. For this reason, researchers investigate the most appropriate pre-treatment method and its parameters for high yield bioethanol production from algae. In this study, cultivated Chlorella minutissima was utilized for bioethanol production. Effects of pre-treatment method (dilute acid and alkaline), chemical concentration, pre-treatment temperature and pre-treatment time on bioethanol yield were investigated. It was found that, the highest bioethanol yield was obtained as 18.52% with acid pre-treatment at pre-treatment temperature of 100 °C and pre-treatment time of 60 minutes.
Highlights
Increase in the world population and emerging industry cause an increase in energy demand which are met by fossil fuels
Fossil fuel resources are exhausting from day to day, and this decline in the reserves increases the price of petroleum fuels because of political impacts
Lignocellulosic biomass is an alternative source for first generation bioethanol feedstocks, it requires intensive labor and a high capital cost for processing.[5]
Summary
Increase in the world population and emerging industry cause an increase in energy demand which are met by fossil fuels. These properties make ethanol more efficient as a pure fuel.[3] Currently, bioethanol production is mostly carried out with sugarcane and corn as first generation bioethanol feedstock Still, it is merely meet the current demand, and there are many conflicts and debates about their sustainability due to the depletion of water sources and the use of arable land to produce biomass for bioethanol production.[4,5] lignocellulosic biomass is an alternative source for first generation bioethanol feedstocks, it requires intensive labor and a high capital cost for processing.[5] Algae are considered as third generation biofuel feedstock and capable of generating more organic carbon per hectare than terrestrial plants.
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