Biomass processing system and saccharide-solution production method using biomass material

A biomass processing system comprising:

• a decomposition liquid supply unit that supplies a decomposition liquid for decomposing a biomass material;
• a pressurizing gas supply unit that supplies a pressurizing gas for pressurizing an inside of the processing vessel;
• a biomass processing unit that decomposes a biomass material containing cellulose, hemicellulose, and lignin under a high temperature and high pressure condition by a processing vessel having a first gas-liquid interface to remove a lignin component and a hemicellulose component, so as to obtain a biomass solid, wherein the biomass processing unit comprises:
• a biomass material inlet that is provided at a lower side of the processing vessel and introduces the biomass material into the processing vessel;
• a decomposition liquid inlet that is provided at an upper side of the processing vessel and introduces the decomposition liquid from the decomposition liquid supply unit;
• a pressurizing gas inlet that introduces the pressurizing gas into the processing vessel from the pressurizing gas supply unit;
• and
• a biomass solid outlet that is provided at an upper side of the processing vessel and from which the decomposed biomass material is discharged as the biomass solid;
• a biomass solid discharging unit that is connected to the biomass solid outlet and discharges the biomass solid;
• and
• a slurrying vessel communicating with the biomass solid discharging unit, into which water is injected and the discharged biomass solid is slurried as a slurried biomass, so as to obtain a second gas-liquid interface of the slurried biomass, wherein the slurrying vessel comprises:
• a biomass solid inlet that communicates with the biomass solid discharging unit and that introduces the biomass solid;
• and
• a slurried biomass outlet from which the slurried biomass is discharged,
• wherein the biomass processing unit is configured to provide the first gas-liquid interface between the biomass material inlet and the biomass solid outlet,
• wherein the slurrying vessel is configured to provide the second gas-liquid interface between the biomass solid inlet and the slurried biomass outlet, and
• wherein a liquid seal is provided between the first gas-liquid interface and the second gas-liquid interface to prevent leakage of the pressurized gas,
• wherein the biomass processing system further comprises:
• a discharge line that is connected to the slurried biomass outlet to discharge the slurried biomass as a slurried biomass solid;
• a solid-liquid separation device that is connected to the discharge line to separate the slurried biomass solid into a biomass solid and water, the water containing a reaction inhibiting substance;
• a return line that connects the solid-liquid separation device and the slurrying vessel to return the water to the slurrying vessel;
• a biological treatment vessel that is provided in the return line and performs biological treatment on the reaction inhibiting substance contained in the water to decompose and remove the reaction inhibiting substance from the water;
• a saccharification tank that is connected to the solid-liquid separation device to perform enzyme liquefaction on the slurried biomass solid by adding an enzyme therein and obtain a saccharide solution.