Fermentation system

The utility model discloses a fermentation system. The system is suitable for the technical field of synthesis gas biological fermentation, a discharging port of a fermentation tank of the fermentation system is connected with a feeding port of a disc centrifugal machine through a first pipeline, a heavy phase liquid outlet of the disc centrifugal machine is connected with a heavy phase liquid inlet of the fermentation tank through a second pipeline, and an inlet of a third pipeline is communicated with the second pipeline. An outlet of the third pipeline is connected with a heavy-phase liquid inlet of the lifting tank, a light-phase liquid outlet of the disc centrifuge is connected with a light-phase liquid inlet of the pervaporation alcohol-permeable membrane group through a fifth pipeline, and a retentate outlet of the pervaporation alcohol-permeable membrane group is connected with a retentate inlet of the fermentation tank through a sixth pipeline; a penetrating fluid outlet of the pervaporation alcohol-