Design and operation of a bench-scale process development unit for the production of ethanol from lignocellulosics
(1996) In Bioresource Technology 58(2). p.171-179- Abstract
- A bench-scale unit for the development of an enzymatic process for the bioconversion of lignocellulosics to ethanol has been used to study the recycling of waste-water streams to minimize fresh-water requirements and reduce effluent streams. Willow, after impregnation with sulphur dioxide, was steam-pretreated, enzymatically hydrolysed, and the sugars produced were fermented using S. cerevisiae. The fermentation broth was distilled and the stillage was fractionated by evaporation into six separate condensate fractions and a residue. The overall yield of ethanol from willow was 65% of the theoretical yield based on total fermentable sugars. The inhibitory effect of the evaporation condensates was assessed by fermentation using S.... (More)
- A bench-scale unit for the development of an enzymatic process for the bioconversion of lignocellulosics to ethanol has been used to study the recycling of waste-water streams to minimize fresh-water requirements and reduce effluent streams. Willow, after impregnation with sulphur dioxide, was steam-pretreated, enzymatically hydrolysed, and the sugars produced were fermented using S. cerevisiae. The fermentation broth was distilled and the stillage was fractionated by evaporation into six separate condensate fractions and a residue. The overall yield of ethanol from willow was 65% of the theoretical yield based on total fermentable sugars. The inhibitory effect of the evaporation condensates was assessed by fermentation using S. cerevisiae. The non-volatile residue of the stillage was found to be inhibitory to fermentation. The ethanol yield decreased from 0.37 g/g in a pure sugar reference to 0.31 g/g in the residue and the average ethanol fermentation rate decreased fi om 6.3 g/(l h) to 2.7 g/(l h), respectively. The evaporation condensates, containing the volatile components, showed no negative effects on fermentation. The intermediate evaporation condensate fractions, fractions 4 and 5, had the lowest chemical oxygen demand (GOD), 1560 and 1120 mg/l, compared with 33 300 mg/l for the stillage. Therefore, these fractions can be released directly into the effluent without further treatment. Copyright (C) 1997 Elsevier Science Ltd. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3911499
- author
- Palmqvist, E ; Hahn-Hägerdal, Bärbel LU ; Galbe, Mats LU ; Larsson, M ; Stenberg, K ; Szengyel, Z ; Tengborg, C and Zacchi, Guido LU
- organization
- publishing date
- 1996
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ethanol production, enzymatic process, lignocellulosics, willow, steam, treatment, inhibitors, waste-water recycling
- in
- Bioresource Technology
- volume
- 58
- issue
- 2
- pages
- 171 - 179
- publisher
- Elsevier
- external identifiers
-
- wos:A1996WG39800009
- scopus:0030295096
- ISSN
- 1873-2976
- DOI
- 10.1016/S0960-8524(96)00096-X
- language
- English
- LU publication?
- yes
- id
- d2c81a58-a61d-42c1-ad93-72ba7895eb31 (old id 3911499)
- date added to LUP
- 2016-04-01 15:21:01
- date last changed
- 2023-11-13 17:40:51
@article{d2c81a58-a61d-42c1-ad93-72ba7895eb31,
abstract = {{A bench-scale unit for the development of an enzymatic process for the bioconversion of lignocellulosics to ethanol has been used to study the recycling of waste-water streams to minimize fresh-water requirements and reduce effluent streams. Willow, after impregnation with sulphur dioxide, was steam-pretreated, enzymatically hydrolysed, and the sugars produced were fermented using S. cerevisiae. The fermentation broth was distilled and the stillage was fractionated by evaporation into six separate condensate fractions and a residue. The overall yield of ethanol from willow was 65% of the theoretical yield based on total fermentable sugars. The inhibitory effect of the evaporation condensates was assessed by fermentation using S. cerevisiae. The non-volatile residue of the stillage was found to be inhibitory to fermentation. The ethanol yield decreased from 0.37 g/g in a pure sugar reference to 0.31 g/g in the residue and the average ethanol fermentation rate decreased fi om 6.3 g/(l h) to 2.7 g/(l h), respectively. The evaporation condensates, containing the volatile components, showed no negative effects on fermentation. The intermediate evaporation condensate fractions, fractions 4 and 5, had the lowest chemical oxygen demand (GOD), 1560 and 1120 mg/l, compared with 33 300 mg/l for the stillage. Therefore, these fractions can be released directly into the effluent without further treatment. Copyright (C) 1997 Elsevier Science Ltd.}},
author = {{Palmqvist, E and Hahn-Hägerdal, Bärbel and Galbe, Mats and Larsson, M and Stenberg, K and Szengyel, Z and Tengborg, C and Zacchi, Guido}},
issn = {{1873-2976}},
keywords = {{ethanol production; enzymatic process; lignocellulosics; willow; steam; treatment; inhibitors; waste-water recycling}},
language = {{eng}},
number = {{2}},
pages = {{171--179}},
publisher = {{Elsevier}},
series = {{Bioresource Technology}},
title = {{Design and operation of a bench-scale process development unit for the production of ethanol from lignocellulosics}},
url = {{http://dx.doi.org/10.1016/S0960-8524(96)00096-X}},
doi = {{10.1016/S0960-8524(96)00096-X}},
volume = {{58}},
year = {{1996}},
}