The previous reactor of the group was constructed during the Interdisciplinary Bachelor Project by the first members of the team. The system consists of two redundant cuboid chambers, inside of which obstacles for the current are placed.
A mixture of carbon dioxide and pressurized air is introduced on the bottom of each chamber, which is flowing around the obstacles and mixes up the water with the algae inside. Further mixing is achieved by a pump inside a bypass, powering a countercurrent inside the chamber.
Illumination is being realized by strips of LED lights that are attached to the outsides of the reactor chambers. The mirroring position of the halves relative to each other enables the parts to light each other.
Problems with this concept lay in the high heat influx from the pumps, which circulate the system. An active cooling system would greatly improve performance in the reactor.