(105f) Maximizing the Biofuel Production Form Algae Using Four Element Strategy and Ultimate Economic Benefits
AIChE Annual Meeting
2023
2023 AIChE Annual Meeting
Sustainable Engineering Forum
Advances in Algae Cultivation, Conversion and Products
Monday, November 6, 2023 - 9:40am to 10:00am
The Four Element Strategy (FES) was used to maximize biofuel production from algae strains and assess the associated economic benefits. The FES is based on considering the type of algal strains, concentration of input CO2 (Cc,g), light intensity (LI) energy, and nutrients requirements (Nitrogen (N) to phosphorus (P) ratio, RN/P) achieve the maximum benefits . Two algal strains was used in the current study, encompassing slain algae Nannochloropsis sp. (Ns), and fresh water strain chlorella vulgaris (Cv). Response Surface Methodology (RSM) and Box Behnkin Design (BBD) combined with the biokinetic model was used to investigate the relation between Cc,g in the range0.03-20 %, RN/P in the 1- 11) and LI 100-400 µE m-2 s-1) and the corresponding CO2 gas fixation rate (RCO2, g L-1 d-1), biomass accumulation (X, g L-1), and algal growth rate (µ, d-1). The results revealed that the optimum productivity conditions are; LI 100-270 µE m-2 s-1, Cc,g 0.03-15%, RN/P 3.5 -11. The corresponding to a maximum RCO2 , X and µ were 1 g L-1 d-1,.6 g L-1, and 1.6 d-1, respectively. The optimized conditions using the desirability function support that a RCO2 of 1.2 g L-1 d-1, X of 1.8 g L-1and µ of 1.7 d-1, when the RN/P,Cc,g , and LI were 11, 4.5% and 200 µE m-2 s-1respectively. The N and P uptake rates for NS were reported at 85 mg L-1 d-1 and 17.1 mg L-1 d-1 compared with only 60.15 mg L-1 d-1 and 2.1 mg L-1 d-1 for Cv, respectively. The maximum BYP of 1.47 g L-1 d-1 was achieved based on the optimum MCT conditions of Cc,g in the range 4-16%); LI in the range 200-250 µE m-2 s-1, and RN/P in the range 8-11 respectively. The total cost required to produce 1 L of biofuel was found to be 0.629 $, and the required cost to cover this cost is 0.138 $ and 0.375 $ for NS and Cv, respectively. The current study provide the guide way for large-scale process for MCT.