CO2 Sequestration through Deep Saline Injection and ...

Figure 9
Fixation Rate vs Cellular Concentration Under Optimal Conditions
Using the estimated data in the previous section and the method discussed above, the optimal
conditions were identified to be: d=0.70 cm, C=0.844 g dry weight/L, and a light intensity input
of 35.56 W/m 2 . This results in a volume specific rate of 13.30 g CO2/L/day, an area specific rate
of 93.11 g CO2/m 2 /day, and a light utilization efficiency of 99.5%. A pct of 95% was used. At
this rate, a total volume of 4.43 x 10 5 m 3 and a luminous plate area of 6.20 x 10 7 m 2 is needed to
sequester 2.325 MtCO2/year (~half of the output from a 500MWe plant). A PAR light
requirement of 4.41 x 10 6 kW is required which results in a total sunlight requirement of 8.82 x
10 6 kW. A greater amount of light will have to be collected due to transmission and collection
losses. These will be discussed in following sections.
20