A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions

Phragmites australis straw (PAS) is an abundant and renewable wetland lignocellulose. Bacillus coagulans IPE22 is a robust thermophilic strain with pentose-utilizing capability and excellent resistance to growth inhibitors. This work is focused on the process study of lactic acid (LA) production fro...

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Bibliographic Details
Published in:Processes 2018-10, Vol.6 (10), p.175
Main Authors: Zhang, Yuming, Li, Mengran, Nie, Tian, Ni, Zhihua
Format: Article
Language:English
Subjects:
Acid production
Bacillus coagulans
Biodiesel fuels
Carbon
Cellulase
Cellulose
Enzymes
Ethanol
Experiments
Fermentation
Glucose
Hydrolysates
Lactic acid
Lignin
Lignocellulose
Pentose
Phragmites australis
Pretreatment
Raw materials
Straw
Sugar
Sulfuric acid
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Summary:Phragmites australis straw (PAS) is an abundant and renewable wetland lignocellulose. Bacillus coagulans IPE22 is a robust thermophilic strain with pentose-utilizing capability and excellent resistance to growth inhibitors. This work is focused on the process study of lactic acid (LA) production from P. australis lignocellulose which has not been attempted previously. By virtue of thermophilic feature of strain IPE22, two fermentation processes (i.e., separated process and integrated process), were developed and compared under non-sterilized conditions. The integrated process combined dilute-acid pretreatment, hemicellulosic hydrolysates fermentation, and cellulose utilization. Sugars derived from hemicellulosic hydrolysates and cellulose enzymatic hydrolysis were efficiently fermented to LA in a single vessel. Using the integrated process, 41.06 g LA was produced from 100 g dry PAS. The established integrated process results in great savings in terms of time and labor, and the fermentation process under non-sterilized conditions is easy to scale up for economical production of lactic acid from PAS.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr6100175