Abstract: The invention relates to a photobioreactor (1) for cultivating phototrophic microorganisms (such as microalgae for example), comprising a reactor element (2) which has a plurality of rising pipes (3a) and falling pipes (3b) for a liquid culture medium (4) containing the microorganisms and which has a distributing pipe (5). The upper ends (6) of each of the rising pipes (3a) and the falling pipes (3b) are connected to the distributing pipe (5) in a liquid-permeable manner. The invention is characterized in that both the culture medium (4) as well as a gas chamber (9) above the culture medium (4) for receiving gas bubbles (10) rising out of the culture medium (4) are provided in the distributing pipe (5) in the operating state, wherein a boundary surface (11) is arranged between the culture medium (4) and the gas chamber (9) in the distributing pipe (5).

Abstract: The present invention relates to a photobioreactor 1 for cultivating phototrophic microorganisms, comprising a reactor element 2, which has a tube 3, a maintenance device 4, and a drive system 5, which can move the maintenance device 4 in the tube 3. The photobioreactor is designed such that liquid culture medium 6 containing the microorganisms flows through at least some of the tube 3 when the photobioreactor 1 is in the operating state. The invention is characterised in that the photobioreactor 1 is designed such that the maintenance device 4 can be used in the tube 3 when the photobioreactor 1 is in operating state and can be moved in the tube 3 at least counter to the flow of the culture medium 6 by the drive system 5.

Abstract: The invention relates to a photobioreactor (1) for cultivating phototrophic microorganisms (such as microalgae for example), comprising a reactor element (2) which has a plurality of rising pipes (3a) and falling pipes (3b) for a liquid culture medium (4) containing the microorganisms and which has a distributing pipe (5). The upper ends (6) of each of the rising pipes (3a) and the falling pipes (3b) are connected to the distributing pipe (5) in a liquid-permeable manner. The invention is characterized in that both the culture medium (4) as well as a gas chamber (9) above the culture medium (4) for receiving gas bubbles (10) rising out of the culture medium (4) are provided in the distributing pipe (5) in the operating state, wherein a boundary surface (11) is arranged between the culture medium (4) and the gas chamber (9) in the distributing pipe (5).

Abstract: The present invention relates to a photobioreactor 1 for cultivating phototrophic microorganisms, comprising a reactor element 2, which has a tube 3, a maintenance device 4, and a drive system 5, which can move the maintenance device 4 in the tube 3. The photobioreactor is designed such that liquid culture medium 6 containing the microorganisms flows through at least some of the tube 3 when the photobioreactor 1 is in the operating state. The invention is characterised in that the photobioreactor 1 is designed such that the maintenance device 4 can be used in the tube 3 when the photobioreactor 1 is in operating state and can be moved in the tube 3 at least counter to the flow of the culture medium 6 by the drive system 5.