Reaction casing for a photosynthetic reactor and associated photosynthetic reactor

A reaction casing for a photosynthetic reactor suitable for cultivating photosynthetic microorganisms said reaction casing being designed to float on an expanse of water and to delimit a two-phase flow pathway for a gas/liquid culture medium between a first and second opening of said reaction casing, said reaction casing comprising, an upper membrane and a lower membrane made at least partially from a material that is flexible, watertight and transparent to light radiation, said membranes being hermetically connected along junction lines delimiting adjacent inflatable cells and, on the other hand, junction elbows pairwise joining said cells to define said flow path of generally sinuous shape, one of the cells being in fluid connection with the first opening and another cell being in fluid connection with the second opening,

• wherein the junction elbows are inflatable junction elbows and are made at least partially from a flexible and watertight material,
• wherein the casing is composed of three distinct portions comprising an upstream portion, a downstream portion and a central portion interposed between the upstream and downstream portions, wherein:
• the upstream portion is composed of an assembly of an upper skin and a lower skin hermetically connected to each other along junction lines in order to delimit both upstream portions of the cells and upstream inflatable junction elbows, the two openings being provided in this upstream portion;
• the downstream portion is composed of an assembly of an upper skin and a lower skin hermetically connected to each other along junction lines in order to delimit both downstream portions of the cells and downstream inflatable junction elbows;
• and
• the central portion is composed of an assembly of an upper skin and a lower skin hermetically connected to each other along junction lines in order to delimit only the central portions of the cells.