MINERAL UPTAKE RATES AND YIELD
COEFFICIENTS OF THE GREEN MICROALGAE
SCENEDESMUS DIMORPHUS
GRACE N. MAHFOUZ
Bachelor of Science in Chemistry
John Carroll University
May 2011
Submitted in Partial Fulfillment of the Requirements for the Degree of
MASTER OF SCIENCE IN CHEMICAL ENGINEERING
at the
CLEVELAND STATE UNIVERSITY
December 2014
© COPYRIGHT BY GRACE N. MAHFOUZ 2014
We hereby approve this thesis for
Grace N. Mahfouz
Candidate for the Master of Science in Chemical Engineering degree for the
Department of Chemical and Biomedical Engineering
and the CLEVELAND STATE UNIVERSITY
College of Graduate Studies
______Thesis Chairperson, Dr. Joanne M. Belovich
______Chemical and Biomedical Engineering Department______Department & Date
______Thesis Committee Member, Dr. Jorge E. Gatica
______Chemical and Biomedical Engineering Department______Department & Date
______Thesis Committee Member, Dr. Orhan Talu
______Chemical and Biomedical Engineering Department______Department & Date
______Thesis Committee Member, Dr. Xiang Zhou
______Chemistry Department ______Department & Date
Student’s Date of Defense: December 5, 2014 ACKNOWLEDGEMENTS
I am deeply thankful to my research advisor, Dr. Joanne Belovich, for her feedback when writing my thesis. Her continuous help and advice throughout my journey in graduate school is wholeheartedly cherished. I am grateful for Dr. Jorge Gatica’s help with statistical analysis. I am very appreciative to the algae team members who provided training and help. Cleveland State University’s Chemical and Biomedical Engineering
Department is greatly acknowledged for the purchase of supplies. I am sincerely thankful for Cleveland State University’s Chemistry Department and Dr. Xiang Zhou for letting me use the Inductively Coupled Plasma. NASA Glenn Research Center is also recognized for allowing me to borrow light meters and well as some lab supplies.
A significant amount of credit is attributed to my parents, Nabil and Takla
Mahfouz, for supporting and helping me in various ways throughout my educational career. They are the reason behind my passion, hard work, and drive to succeed. I could not have been blessed with better parents. Thank you for all your sacrifices; I would not be where I am today without your unconditional love and caring. Last but not least I would like to thank my sister and brother, Dalia and Wassim for their love and support and for bearing with me in the hard times.
Mineral Uptake Rates and Yield Coefficients of the Green Microalgae Scenedesmus Dimorphus
Grace N. Mahfouz
ABSTRACT
The need for renewable sources of energy has become critical as fossil fuel resources, which include oil, coal, and natural gas, are known to contribute to climate change and will eventually be depleted. Biofuels that originate from the fat of plants, animals, microalgae, and bacteria are an attractive alternative. Microalgae, in particular, are strong candidates for biofuel production since they have a high growth rate and lipid content (up to 50% in some species). The goal of this research was to optimize 3N-
BBM+V recipe (Bold Basal Medium with 3-fold Nitrogen and Vitamins) in an effort of reducing the amount of nutrients used in growing the green microalgae Scenedesmus dimorphus, and hence lower the cost of cultivation. Three runs were carried out on a 5L bioreactor in batch mode. The average growth rate of S. dimorphus was 0.17 ± 0.03 days-1.
Inductively Coupled Plasma was utilized to monitor substrate concentration with time in the bioreactor which allowed the determination of yield coefficien