The gas dual-dynamic solid state fermentation technique consists of
placing the solid materials to be fermented in an air environment with
pulsating pressure and cyclic flow to carry out fermentation, the
fermentation apparatus comprises a horizontal cylindrical tank with a
quick door mechanism, in the tank are axially disposed rectangular spacer
barrels of square cross-section constructed by four baffles, in the space
between baffles and the tank wall are provided cooler tubes in parallel
with the baffles, in the middle of the spacer barrels are provided
vertically many sets of cooler tubes, on the lower baffles in the tank is
provided axially an fixed track, on which are movable tray racks that can
roll on the track, the tray racks having thereon a plurality of layers of
trays, at the rear of the tank is provided a centrifugal blowers for
forcing gas cycling in the tank. The inventive technique and apparatus
allows microbial pure cultivation, is easy for scaling up and high in
fermentation virulence titre and produce no pollution. It is useful for
fermentation production of biological pesticides, enzyme preparations,
agricultural antibiotics and unicell albumen.