Biomass processing system, saccharide solution production method using biomass feedstock, alcohol production method

A biomass processing system comprising:

• a hydrolysis processing unit that provides a first gas-liquid interface therein and comprises:
• a biomass providing unit that supplies biomass feedstock containing cellulose, hemicellulose, and lignin;
• a supply inlet that supplies pressurized hot water;
• an apparatus main body that brings the biomass feedstock and the pressurized hot water into countercurrent contact so as to hydrolyze the biomass feedstock;
• an outlet from which a hot water discharge liquid containing a biomass hot-water soluble element dissolved in the pressurized hot water is discharged;
• and
• a biomass solid content outlet from which a biomass solid content is discharged, the biomass solid content containing a hot water insoluble element of the biomass feedstock;
• a biomass solid content discharge unit that discharges the biomass solid content processed by the hydrolysis processing unit;
• a slurrying vessel that is in communication with the biomass solid content discharge unit and that subjects the discharged biomass solid content to slurrying;
• and
• a discharge liquid introducing line that introduces, into the slurrying vessel, the hot water discharge liquid containing the biomass hot-water soluble element discharged from the hydrolysis processing unit,
• wherein the biomass solid content is mixed with the hot water discharge liquid to be made into a mixture slurry,
• wherein a filter that separates a solid content including a lignin component from the hot water discharge liquid is interposed in the discharge liquid introducing line,
• wherein the biomass processing system further comprises:
• a saccharide-concentrating apparatus that is provided downstream of the slurrying vessel, that performs enzymatic saccharification on the mixture slurry to produce a saccharide solution, and that separates water from the saccharide solution so as to concentrate the saccharide solution;
• a water return line that returns the water to the slurrying vessel;
• and
• an organism processing apparatus that is provided in the water return line and that performs organism processing on a reaction inhibition substance in the water.