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Input CO2 Concentration
Data in Table 7.1 present the effect of CO2 concentration of the input gas on biomass concentration and CO2 removal of cyanobacterium Synechococcus sp. (Takano et al. 1992). When the CO2 concentration of the input gas increased from 0.03 to 0.55 %, the biomass concentration rose by 1.5-fold and the CO2 removal rate more than doubled. However, when the input gas concentration further increased from 0.55 to 1.10 %, only a slight increase in CO2 removal occurred (Takano et al. 1992). Furthermore, Fig. 7.4 shows the influence of the input CO2 content on S. obliquus WUST4 (Li et al. 2011) in the range of 6-18 %. The highest CO2 fixation efficiency (67 %) was achieved at 12-14 % CO2, indicating higher CO2 concentration is an inhibitory factor to CO2 fixation, and is an species — dependent variable tolerance.
|
PBR |
Microalgae |
T |
Supplied |
Gas flow |
Cell |
Biomass |
Light intensity |
CO2 fixation |
Ref. |
|
|
Type |
Vol (L) |
(°С) |
co2 % |
rate—^ min |
density (|) |
concentration (|) |
(Lux) |
rate (l~d) |
||
|
V ertical bubble column |
40 |
(17.) |
40 |
5 |
10 |
1 |
— |
1500 |
0.0124 |
Ong et al. (2010) |
|
Vertical bubble column |
40 |
(17.) |
40 |
5 |
10 |
2 |
— |
1500 |
0.0144 |
Ong et al. (2010) |
|
Vertical bubble column |
40 |
(17.) |
40 |
5 |
10 |
3 |
— |
1500 |
0.016S |
Ong et al. (2010) |
|
Vertical bubble column |
40 |
(IS.) |
40 |
5 |
10 |
1 |
— |
1500 |
0.0109 |
Ong et al. (2010) |
|
Vertical bubble column |
40 |
(IS.) |
40 |
5 |
10 |
2 |
— |
1500 |
0.0148 |
Ong et al. (2010) |
|
Vertical bubble column |
40 |
(IS.) |
40 |
5 |
10 |
3 |
— |
1500 |
0.0177 |
Ong et al. (2010) |
|
— |
2.5 |
(7.) |
— |
0.55 |
soo |
1.4 |
1.92 |
1250 |
1.06 |
Takano et al. (1992) |
|
— |
2.5 |
(7.) |
— |
0.55 |
soo |
2.4 |
3 |
1250 |
1.52 |
Takano et al. (1992) |
|
— |
2.5 |
(7.) |
— |
0.55 |
soo |
5.5 |
6.28 |
1250 |
1.9S |
Takano et al. (1992) |
|
— |
2.5 |
(7.) |
— |
0.55 |
soo |
6.76 |
7.76 |
1250 |
2.22 |
Takano et al. (1992) |
|
Table 7.5 Effect of initial cell concentrations on C02 removal rates |
|
Chlorella sp. MT-7 (17), Chlorella sp. MT-15 (18), and Synechoccus sp. (7) |
|
C02 Environmental Bioremediation by Microalgae |