Microalgae Capture of CO₂ from Actual Flue Gas Discharged from a Combustion Chamber

Fixation CO 2 with microalgae is a potential promising technique to reduce CO 2 emission for its various advantages. In this work, we develop a microalgal fixation CO 2 system to capture CO 2 from actual flue gas. At first, we evolved a strain Scenedesmus obliquus, named S. obliquus WUST4, with a UV mutagenesis technique, which can endure actual flue gas. The S. obliquus WUST4 can tolerate high concentration CO 2, and possesses high CO 2 fixation ability. Then, we developed a pilot scale microalgal fixation CO 2 system to capture CO 2 from actual flue gas with the evolved S. obliquus WUST4. The flue gas was discharged from the combustion chamber in a coke oven. A 100 L air-lift photobioreactor was built in this system. In the pilot scale system, CO 2 can be captured from the actual flue gas by the S. obliquus WUST4. The CO 2 removal ratio can reach 67% with the optimal operation conditions. This provides an efficient technique for CO 2 capture.