Another significant water stream occurs in the enzymatic hydrolysis with the dilution of cellulose fibers and the washing of
hydrolysis lignin. However, this stream could be reduced by the recirculation of the bottom stream from the CO2 scrubber and lutter water from the ethanol recovery. Due to a high ethanol
recovery rate of more than 99% in the solvent recovery and the recycling of purified ethanol from the ethanol recovery process,