This matures the organic matter composted in rector 1, after the first grading.
The belt that comes from grading takes the organic matter along the reactor (168 m). A wheel with shovels pushes it into the reactor, always on the same side.
The reactor has one overhead traveling crane with augers that roll and transport the decomposing matter to the opposite side of the reactor (26 m). The organic matter takes 28 days to complete this journey. During this time it's sprinkled with leachates and aerated from below, to keep the optimal conditions for a rapid decomposition.
At the end of the journey, the auger drops the decomposed matter on another conveyor belt, that takes it to the second grading.