NOVELTY - A bioreactor (10) including a horizontal containing vessel (11) having a base (12) and at least one upstanding sidewall (13), inlet (14) located at a lower portion of containing vessel, at least one outlet (15) located at upper portion of containing vessel, at least one light source (17) and diffuser, where the bioreactor operable in a growth mode in which the inlet to the containing vessel and the outlet are closed, gas or other material beneficial to the growth of the biological material is bubbled through the liquid growth media contained in the containing vessel via the diffuser.    USE - As a bioreactor used for growing carbon dioxide sequestrating biological material, methane digestion, fuel production or water production.    ADVANTAGE - The bioreactor provides a low-cost bioreactor with simple, effective design capable of providing a continuous or reusable process.    DETAILED DESCRIPTION - A bioreactor (10) including a horizontal containing vessel (11) having a base (12) and at least one upstanding sidewall (13), at least one inlet (14) located at a lower portion of the containing vessel, at least one outlet (15) located at an upper portion of the containing vessel, at least one light source (17) and at least one diffuser, the bioreactor operable in a growth mode in which the inlet to the containing vessel and the outlet are closed, gas or other material beneficial to the growth of the biological material is bubbled through the liquid growth media contained in the containing vessel via the diffuser, where the biological material floats on the liquid growth media as it grows until a satisfactory amount of the biological material has accumulated in the floating layer, and the bioreactor is switched to the extraction mode in which the inlet is opened and liquid is pumped into the containing vessel to raise the level in the vessel such that as the biological material via reaches the level of the outlet, the biological material layer can be removed from the top of the liquid with minimal liquid removed.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional side view of bioreactor.    Bioreactor (10)    Horizontal containing vessel (11)    Base (12)    Upstanding sidewall (13)    Inlet (14)    Outlet (14)    Light source (17)