Biological treatment of eucalypt spent sulphite liquors: A way to boost the production of second generation bioethanol
authors Pereira, SR; Ivanusa, S; Evtuguin, DV; Serafim, LS; Xavier, AMRB
nationality International
journal BIORESOURCE TECHNOLOGY
author keywords Biological treatment; Detoxification; Hardwood (eucalypt) spent sulphite liquor; Second generation bioethanol
keywords FUNGUS PAECILOMYCES-VARIOTII; PICHIA-STIPITIS; SYRINGIC ACID; ETHANOL; DEGRADATION; INHIBITION; SELECTION; XYLOSE
abstract The fermentation of reducing sugars from hardwood (eucalypt) spent sulphite liquor (HSSL) into ethanol by Pichia (Scheffersomyces) stipitis is hindered by concomitant inhibitors of microbial metabolism. The conditions for the HSSL biological treatment step by Paecilomyces variotii were evaluated and optimised. Two different strategies of reactor operation were compared using single batch (B) and sequential batch reactor (SBR). Biological treatment of HSSL in the SBR revealed the best results with respect to the removal of microbial inhibitors. Also, most of inhibitory compounds, acetic acid, gallic acid, pyrogallol, amongst others, were removed from HSSL by P. variotii before the ethanol fermentation. The bio-detoxified HSSL was subjected to a successful fermentation by P. stipitis, attaining a maximum ethanol concentration of 2.4 g L(-1) with a yield of 0.24 g ethanol g sugars(-1). (C) 2011 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0960-8524
year published 2012
volume 103
issue 1
beginning page 131
ending page 135
digital object identifier (doi) 10.1016/j.biortech.2011.09.095
web of science category Agricultural Engineering; Biotechnology & Applied Microbiology; Energy & Fuels
subject category Agriculture; Biotechnology & Applied Microbiology; Energy & Fuels
unique article identifier WOS:000298273600019
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