A horizontal fermenter for a continuous fermentation process comprises a horizontally elongated fermenter tank (101)and an agitator (104) for mixing biomass material in the fermenter tank. The fermenter tank comprises an inlet (102) at a first end of the fermenter tank for receiving biomass material and an outlet (103) at a second end of the fermenter tank for removing the biomass material flowed from the first end to the second end. The agitator comprises a rotatable shaft (105) parallel with the longitudinal direction of the fermenter tank. The agitator comprises agitator arms that are shaped to constitute blades angled with respect to the longitudinal direction for moving the biomass material in the longitudinal direction when the agitator is rotating. Thus, the agitator is suitable for not only mixing the biomass material but also for conveying the biomass material.
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