Aqueous phase reforming (APR) of powdered Chlorella vulgaris biomass was done at the University of Zaragoza, Spain to produce hydrogen with or without Ni catalyst with two pressure 30 or 35 bars at 227 o C.
The maximum H2 yield was 0.427 x 10-3 and 0.542 x 10-3 moles of H2 per 3 g of dry algal biomass, with Ni as catalyst at both pressure conditions.
Oil extraction from the feedstock is one of the most energy intensive parts of the process in the production chain.
Oil extraction methods are influenced by the operational physical parameters or chemical characteristics, and their selection greatly impacts the final oil yields.
The bio-oil content yield was found higher at 350 o C with 30 as compared to 60 min holding times and the GC-MS analysis showed the presence of fatty acids (C14-C18).
The aqueous phase contained TOC, TN and TP, which are useful nutrients for microalgae cultivation.
This thesis investigates and compares different oil extraction methods and tries to fill the research gaps in the oil extraction processing, for example, utilising new techniques such as ultrasonic or microwave assisted solvent extraction.
A detailed energy analysis for the extraction processes was conducted for each method to investigate the process feasibility to produce biodiesel more economically.
Microalgae species Nannochloropsis oculata, was cultivated and harvested in the School of Engineering, University of Glasgow.
The lipids were extracted to investigate their potential to produce algal biodiesel.