under atmospheric conditions after the separation
of the solids from the pretreatment hydrolysate using a
screen. The pretreatment hydrolysates were saved for chemical
composition analysis. The disk mill was equipped with plates of
pattern D2-B505 (Andritz Sprout-Bauer Atmospheric Refiner,
Springfield, OH). The disk plate gap was set at 1.02 mm. Water
was added during disk milling, which resulted in a solids discharge
consistency of approximately 10%. The energy consumption for
disk milling was recorded as described elsewhere [18,25]. The
size-reduced solids were directly dewatered by pressing using a
canvas bag to a solids content of approximately 30%, without a