Abstract: A scrubber unit for removal of carbon dioxide from flue gas, including a first chamber, a second chamber, a partition dividing the first chamber and the second chamber, a first weir to distribute flow across of aqueous absorbent across the chamber, and a second weir in the second chamber. The partition is positioned to allow fluid to flow from the first chamber to the second chamber beneath a lower edge of the partition. The scrubber may be used in an algae growing system, along with an algae bioreactor, with the aqueous absorbent solution flowing in a continuous circuit through the wet scrubber and the algae bioreactor to absorb carbon dioxide in the wet scrubber and to provide the absorbed carbon dioxide to algae.