Abstract: Some embodiments provide a process for the production of ethanol. The process includes performing liquefaction, saccharification, and fermentation steps to produce ethanol from an organic material. In one embodiment, the liquefaction step may include disposing a carbon-containing material within a first vessel, adding at least one enzyme to the first vessel, and incubating the first vessel at a first temperature for a predetermined time period. Next, the saccharification step can include adding at least one enzyme to the first vessel and then incubating the first vessel at a second temperature to form a liquefact in the first vessel. Then, in some embodiments, the fermentation step includes removing the liquefact from the first vessel and transferring the liquefact to a second vessel. Once in the second vessel, at least one additional enzyme, at least one nutrient, and a plurality of yeast cells can be added to the second vessel. Then, the second vessel is incubated to promote fermentation.