Renewable Bio-Oil from Pyrolysis of Synechocystis and Scenedesmus Wild-Type Microalgae Biomass
Abstract
In this study, biomasses of microalgae Scenedesmus and Synechocystis species were thermochemically converted to biofuel in a
fast pyrolysis process. The effect of pyrolysis temperature on the products yield was investigated. The optimal pyrolysis
temperature for Scenedesmus and Synechocystis biomass was 500 °C and 600 °C, respectively, resulting in higher bio-oil yield
of 35.3 wt% and 21.1 wt%. The produced bio-oil had higher high heating value (HHV) (35–40 MJ/kg) than that of beech wood
source bio-oil (23–35 MJ/kg). The obtained biochar had low surface area but with considerable nitrogen, phosphorus, and other
mineral content was suggested as fertilizer. It was concluded that the microalgae type and its cultivation and harvesting method
affects the characteristics of the products and final energy efficiency as well. Energy efficiency assessment showed that the
technology needs to be improved substantially to reduce the energy demand in cultivation, harvest, and pyrolysis step to be
energy efficient.
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