In this study, production of cellul

In this study, production of cellulosic ethanol from two cotton processing residues was investigated afterpretreatment with dilute sodium hydroxide. Pretreatment performance was investigated using a 22.fac-torial design and the highest glucan conversion was achieved at the most severe alkaline conditions (0.4 gNaOH g1.of dry biomass and 120°C), reaching 51.6% and 38.8% for cotton gin waste (CGW) and cottongin dust (CGD), respectively. The susceptibility of pretreated substrates to enzymatic hydrolysis was alsoinvestigated and the best condition was achieved at the lowest total solids (5 wt%) and the highestenzyme loading (85 mg of Cellic CTec2 g1.of dry substrate). However, the highest concentration of fer-mentable sugars – 47.8 and 42.5 g L1.for CGD and CGW, respectively – was obtained at 15 wt% totalsolids using this same enzyme loading. Substrate hydrolysates had no inhibitory effects on the ferment

In, this study production of cellulosic ethanol from two cotton processing residues was investigated after
pretreatment. With dilute sodium hydroxide. Pretreatment performance was investigated using a 2

-
2 fac torial design and the highest glucan. Conversion was achieved at the most severe alkaline conditions (0.4 g



NaOH g  1 of dry biomass and 120
°
C), reaching 51.6% and 38.8% for cotton gin waste (CGW) and cotton
gin dust (CGD), respectively. The susceptibility of pretreated substrates to enzymatic. Hydrolysis was also
investigated and the best condition was achieved at the lowest total solids (5 wt%) and the highest
enzyme. Loading (85 mg of Cellic CTec2 G


 1 of dry substrate). However the highest, concentration of fer -
mentable sugars - 47.8 and 42.5 G. L


. 1 For CGD, and CGW respectively - was obtained at 15 wt% total
solids using this same enzyme loading. Substrate hydrolysates. Had no inhibitory effects on the ferment.