Utilisation of microwave-NaOH pretreatment technology to improve performance and l-lactic acid yield from vinasse

Jianguo Liu, Qunhui Wang, Shuang Wang, Dexun Zou, Kenji Sonomoto

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Pretreatment of vinasse is necessary to break down its complex wooden structure, improve the efficiency of enzymolysis, and provide an adequate substrate for fermentation during l-lactic acid production. Independent microwave and NaOH pretreatment processes were carried out in an earlier study. Here a two-way microwave-NaOH coupled method, was investigated to determine the effects of simultaneous saccharification and fermentation (SSF) of vinasse on l-lactic acid production. Compared with the former individual microwave and NaOH pretreatment methods, hemicellulose and lignin in vinasse were more significantly reduced using microwave-NaOH coupled pretreatments, reducing crystallinity to 14.77%. l-lactic acid yield was also higher in the coupled method than the sum of the yields from the independent pretreatment processes. The optimal conditions for the coupled pretreatment method were: 0.06 g g -1 (vinasse dry weight) NaOH; 523 W microwave power; 1:2 solid-liquid ratio; and 8 min microwave pretreatment time. These conditions resulted in an 86.0 mg g -1 l-lactic acid yield. The microwave power and the amount of alkali used were approximately 25% lower than those used prior to the optimisation process. The reduced values indicate that optimisation can significantly decrease energy and reagent consumptions. Thus, microwave-NaOH coupled pretreatment exhibits a synergistic effect for improving l-lactic acid production.

Original languageEnglish
Pages (from-to)6-13
Number of pages8
JournalBiosystems Engineering
Volume112
Issue number1
DOIs
Publication statusPublished - May 1 2012

Fingerprint

vinasse
Lactic acid
Microwaves
lactic acid
Lactic Acid
pretreatment
Technology
acid
Fermentation
fermentation
Saccharification
saccharification
microwave
Lignin
Alkalies
crystallinity
methodology
hemicellulose
alkalis
lignin

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Food Science
  • Animal Science and Zoology
  • Agronomy and Crop Science
  • Soil Science

Cite this

Utilisation of microwave-NaOH pretreatment technology to improve performance and l-lactic acid yield from vinasse. / Liu, Jianguo; Wang, Qunhui; Wang, Shuang; Zou, Dexun; Sonomoto, Kenji.

In: Biosystems Engineering, Vol. 112, No. 1, 01.05.2012, p. 6-13.

Research output: Contribution to journalArticle

Liu, Jianguo ; Wang, Qunhui ; Wang, Shuang ; Zou, Dexun ; Sonomoto, Kenji. / Utilisation of microwave-NaOH pretreatment technology to improve performance and l-lactic acid yield from vinasse. In: Biosystems Engineering. 2012 ; Vol. 112, No. 1. pp. 6-13.
@article{01689e6b6613459690b9bc3554dc322e,
title = "Utilisation of microwave-NaOH pretreatment technology to improve performance and l-lactic acid yield from vinasse",
abstract = "Pretreatment of vinasse is necessary to break down its complex wooden structure, improve the efficiency of enzymolysis, and provide an adequate substrate for fermentation during l-lactic acid production. Independent microwave and NaOH pretreatment processes were carried out in an earlier study. Here a two-way microwave-NaOH coupled method, was investigated to determine the effects of simultaneous saccharification and fermentation (SSF) of vinasse on l-lactic acid production. Compared with the former individual microwave and NaOH pretreatment methods, hemicellulose and lignin in vinasse were more significantly reduced using microwave-NaOH coupled pretreatments, reducing crystallinity to 14.77{\%}. l-lactic acid yield was also higher in the coupled method than the sum of the yields from the independent pretreatment processes. The optimal conditions for the coupled pretreatment method were: 0.06 g g -1 (vinasse dry weight) NaOH; 523 W microwave power; 1:2 solid-liquid ratio; and 8 min microwave pretreatment time. These conditions resulted in an 86.0 mg g -1 l-lactic acid yield. The microwave power and the amount of alkali used were approximately 25{\%} lower than those used prior to the optimisation process. The reduced values indicate that optimisation can significantly decrease energy and reagent consumptions. Thus, microwave-NaOH coupled pretreatment exhibits a synergistic effect for improving l-lactic acid production.",
author = "Jianguo Liu and Qunhui Wang and Shuang Wang and Dexun Zou and Kenji Sonomoto",
year = "2012",
month = "5",
day = "1",
doi = "10.1016/j.biosystemseng.2012.01.004",
language = "English",
volume = "112",
pages = "6--13",
journal = "Biosystems Engineering",
issn = "1537-5110",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Utilisation of microwave-NaOH pretreatment technology to improve performance and l-lactic acid yield from vinasse

AU - Liu, Jianguo

AU - Wang, Qunhui

AU - Wang, Shuang

AU - Zou, Dexun

AU - Sonomoto, Kenji

PY - 2012/5/1

Y1 - 2012/5/1

N2 - Pretreatment of vinasse is necessary to break down its complex wooden structure, improve the efficiency of enzymolysis, and provide an adequate substrate for fermentation during l-lactic acid production. Independent microwave and NaOH pretreatment processes were carried out in an earlier study. Here a two-way microwave-NaOH coupled method, was investigated to determine the effects of simultaneous saccharification and fermentation (SSF) of vinasse on l-lactic acid production. Compared with the former individual microwave and NaOH pretreatment methods, hemicellulose and lignin in vinasse were more significantly reduced using microwave-NaOH coupled pretreatments, reducing crystallinity to 14.77%. l-lactic acid yield was also higher in the coupled method than the sum of the yields from the independent pretreatment processes. The optimal conditions for the coupled pretreatment method were: 0.06 g g -1 (vinasse dry weight) NaOH; 523 W microwave power; 1:2 solid-liquid ratio; and 8 min microwave pretreatment time. These conditions resulted in an 86.0 mg g -1 l-lactic acid yield. The microwave power and the amount of alkali used were approximately 25% lower than those used prior to the optimisation process. The reduced values indicate that optimisation can significantly decrease energy and reagent consumptions. Thus, microwave-NaOH coupled pretreatment exhibits a synergistic effect for improving l-lactic acid production.

AB - Pretreatment of vinasse is necessary to break down its complex wooden structure, improve the efficiency of enzymolysis, and provide an adequate substrate for fermentation during l-lactic acid production. Independent microwave and NaOH pretreatment processes were carried out in an earlier study. Here a two-way microwave-NaOH coupled method, was investigated to determine the effects of simultaneous saccharification and fermentation (SSF) of vinasse on l-lactic acid production. Compared with the former individual microwave and NaOH pretreatment methods, hemicellulose and lignin in vinasse were more significantly reduced using microwave-NaOH coupled pretreatments, reducing crystallinity to 14.77%. l-lactic acid yield was also higher in the coupled method than the sum of the yields from the independent pretreatment processes. The optimal conditions for the coupled pretreatment method were: 0.06 g g -1 (vinasse dry weight) NaOH; 523 W microwave power; 1:2 solid-liquid ratio; and 8 min microwave pretreatment time. These conditions resulted in an 86.0 mg g -1 l-lactic acid yield. The microwave power and the amount of alkali used were approximately 25% lower than those used prior to the optimisation process. The reduced values indicate that optimisation can significantly decrease energy and reagent consumptions. Thus, microwave-NaOH coupled pretreatment exhibits a synergistic effect for improving l-lactic acid production.

UR - http://www.scopus.com/inward/record.url?scp=84862812474&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84862812474&partnerID=8YFLogxK

U2 - 10.1016/j.biosystemseng.2012.01.004

DO - 10.1016/j.biosystemseng.2012.01.004

M3 - Article

AN - SCOPUS:84862812474

VL - 112

SP - 6

EP - 13

JO - Biosystems Engineering

JF - Biosystems Engineering

SN - 1537-5110

IS - 1

ER -