NOVELTY - Static solid state bioreactor (100) (I), comprises: a vessel (10) having an upper end (14) and a lower end (12), where the upper end has a sealable opening (16); a gas distribution system in communication with the upper end and the lower end of the vessel; a liquid distribution system in communication with the upper end of the vessel; a liquid recovery system in communication with the lower end of the vessel; and a material removal system disposed at the lower end of the vessel for removing biomass residue from the vessel.    USE - (I) is useful: to perform a static solid state fermentation of biomass; and for producing a gaseous fuel from a biomass material (all claimed). (I) is useful for saccharification of complex carbohydrates in biomass.    ADVANTAGE - (I) maintains the temperature within the bioreactor within acceptable process limits during the conversion process. (I): provides high product yield, low cost, ease of use, and scalability; and has increased hydraulic conductivity, hence eliminates channeling and also prevents the biomass from dramatically reducing in volume as the saccharification and/or fermentation processes occur, which prevents the biomass from pulling away from the walls of the bioreactor, another common cause of channeling.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a method of performing static solid state fermentation, comprising: mixing a bulking agent with a biomass to form a mixture; adding the mixture to a static solid state bioreactor (100); irrigating the mixture with an aqueous solution; flowing a gas through the mixture; and maintaining a microorganism supporting environment within the mixture by calculating a specific heat of an aqueous solution flow, calculating a specific heat of a gas flow, and balancing the aqueous solution flow with the gas flow;    (2) a non-stirred solid state bioreactor, comprising: a hollow body for stacking biomass in it, where the stacked biomass is stored within the hollow body under conditions suitable for fermentation, the hollow body has a lower end (12) and an upper end (14), in which the lower end is perforated to allow the a flow of gas and a liquid through the stacked biomass, and the upper end has at least one sealable opening (16) for the stacking of biomass within the hollow body; a passageway for removal of decomposed biomass material at the lower end of the hollow body; a material removal system operatively provided within the hollow body at the lower end, where the material removal system is configured to direct the flow of decomposed biomass material toward the passageway during unloading of the hollow body; a gas delivery system coupled to the upper end and the lower end of the hollow body and configured to flow gas through the stacked biomass from the lower end to the upper end and from the upper end to the lower end; an irrigation system disposed within the hollow body proximate to the upper end of the vessel (10) and configured to irrigate the stacked biomass from above; and a system for collecting liquid effluent that drains from the stacked biomass operatively provided proximate to the perforated lower end;    (3) a bioreactor-1 for performing static solid state fermentation of biomass, comprising: a vessel having an upper end and a lower end, where the lower end has many openings and a material removal port; many gas ports in communication with a gas distribution system and in communication with the openings in the lower end of the vessel; many liquid ports in communication with a liquid collection system and in communication with the openings in the lower end of the vessel; and at least one screen disposed in the lower end of the vessel covering the openings;    (4) a bioreactor for producing a gaseous fuel from a biomass material, comprising: a gas tight vessel having an upper end and a lower end, where the upper end has a sealable opening; at least one fan; a duct, where the duct is disposed on the upper end of the vessel, the lower end of the vessel, and the at least one fan, and the vessel is in communication with the fan through the duct; at least one valve, disposed along a length of the duct, where the valve can change a gas flow direction and cause the gas to flow in a direction from the lower end of the vessel to the upper end of the vessel and in a direction from the upper end of the vessel to the lower end of the vessel;    (5) a bioreactor for producing a gaseous fuel from a biomass material, comprising: many gas tight vessels having an upper end and a lower end, where the upper end has a sealable opening; and a gas distribution system in communication with the upper end and the lower end of the vessels, where a gas can be recycled from a first vessel of the vessels to a second vessel of the vessels;    (6) a method of producing a gaseous fuel from a biomass material, comprising: preparing a first volume of biomass for reaction; and flowing a gas from a second volume of reacting biomass through the first volume of biomass; and    (7) a bioreactor for producing a gaseous fuel from a biomass material, comprising: a gas tight volume having an upper end and a lower end; a mixture of biomass and bulking agent disposed within the gas tight volume; a gas distribution system in communication with the upper end and lower end of the gas tight volume; a liquid distribution system in communication with the upper end of the gas tight volume; and a liquid recovery system in communication with the lower end of the gas tight volume, where a microorganism supporting environment is maintained by balancing a counter-current flow of gas through the mixture from the gas distribution system with a counter-current flow of fluid through the mixture from the liquid distribution system to the liquid recovery system.    DESCRIPTION OF DRAWING(S) - The figure illustrates a bioreactor for performing static solid state saccharification and/or fermentation of biomass.    Vessel (10)    Lower end (12)    Upper end (14)    Sealable opening (16)    Bioreactor (100)