GRAVITY FLOW TUBULAR PHOTOBIOREACTOR AND PHOTOBIOREACTOR FARM
A gravity flow photobioreactor core (10) comprised of a support means (3); a tube (5) that continuously runs and curls with declination about a vertical axis to form a stack (7) of levels (9) and having an inlet sparge (11); a gas exchange tank (13) and a central feed pipe (15) with a sparge (17). A gravity flow photobioreactor farm comprised of a bottom tank (19); a pump (21); a plurality of bioreactor cores (10) connected in series at decreasing elevations and a return pipe (23).