Cotton ginning trash (CGT) collected from Australian cotton gins was evaluated for bioethanol
production.
CGT composition varied between ginning operations and contained high levels of extractives
(26–28%), acid-insoluble material (17–22%) and holocellulose (42–50%). Pretreatment conditions of time
(4–20 min), temperature (160–220 ํC) and sulfuric acid concentration (0–2%) were optimised using a
central composite design.
Response surface modelling revealed that CGT fibre pretreated at 180 ํC in
0.8% H2SO4 for 12 min was optimal for maximising enzymatic glucose recoveries and achieved yields
of 89% theoretical, whilst the total accumulated levels of furans and acetic acid remained relatively
low at <1 and 2 g/L respectively. Response surface modelling also estimated maximum xylose recovery
in pretreated liquors (87% theoretical) under the set conditions of 150 ํC in 1.9% H2SO4 for 23.8 min. Yeast
fermentations yielded high ethanol titres of 85%, 88% and 70% theoretical from glucose generated from:
(a) enzymatic hydrolysis of washed pretreated fibres, (b) enzymatic hydrolysis of whole pretreated
slurries and (c) simultaneous saccharification fermentations, respectively.
Crown Copyright 2014 Published by Elsevier Ltd. All rights reserved.
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