NOVELTY - A biomass fermenter for fermenting biomass such as livestock excrements on a small-scale dairy farm, is new.    USE - Biomass fermenter for fermenting biomass such as livestock excrements in small-scale dairy farm.    ADVANTAGE - Enables continuous and efficient fermentation of the biomass at low cost, by using simple biomass fermenter.    DETAILED DESCRIPTION - A biomass fermenter for fermenting biomass such as livestock excrements on a small-scale dairy farm, is new. An outflow port is arranged in position lower than an inflow port. A partition plate (10) divides a tank into primary and secondary tanks. The shape of the primary tank is narrow at top and wider at bottom and the shape of the secondary tank is narrow at bottom and wide at top. An inner wall surface in the outflow side, extends forwardly along the flowing direction. An inner bottom face is included rearwardly along the flowing direction. A stirring mechanism is arranged in the fermenter to stir the biomass. A collection portion collects biomass (B) precipitated in the bottom wall of the fermenter (1). The biomass is irradiated with electromagnetic wave, ultrasonic wave and far infrared radiation selectively.    An INDEPENDENT CLAIM is also included for installation configuration of biomass fermenter which has a cover (13) arranged upwards of the fermenter. An extraction opening (16) is formed in the surface of the cover, so as to extract fermentation gas. A heat insulation material is fixed to the cover. A ventilation opening (15) is formed in the cover to connect a perspiration room (14) with outer air.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the biomass fermenter. (Drawing includes non-English language text).    biomass fermenter (1)    discharge ports (9)    partition plates (10)    discharge pipes (12)    exits (12a)    cover (13)    perspiration room (14)    ventilating opening (15)    extraction opening (16)    circulation pump (20)    circulation pipe (21)    biomass (B)