Xylose recovery and bioethanol production from sugarcane bagasse pretreated by mild two-stage ultrasonic assisted dilute acid

Sheng-Jie Chen; Xiong Chen; Ming-Jun Zhu

doi:10.1016/j.biortech.2021.126463

Xylose recovery and bioethanol production from sugarcane bagasse pretreated by mild two-stage ultrasonic assisted dilute acid

Bioresour Technol. 2022 Feb:345:126463. doi: 10.1016/j.biortech.2021.126463. Epub 2021 Dec 8.

Authors

Sheng-Jie Chen¹, Xiong Chen², Ming-Jun Zhu³

Affiliations

¹ School of Biology and Biological Engineering, Guangdong Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China.
² Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan 430068, Hubei, People's Republic of China.
³ School of Biology and Biological Engineering, Guangdong Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Panyu, Guangzhou 510006, People's Republic of China; Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan 430068, Hubei, People's Republic of China; The Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang Uygur Autonomous Region, The Key Laboratory of Ecology and Biological Resources in Yark and Oasis at Colleges & Universities under the Department of Education of Xinjiang Uygur Autonomous Region, College of Life and Geographic Sciences, Kashi University, Kashi 844006, People's Republic of China. Electronic address: mjzhu@scut.edu.cn.

PMID: 34896260
DOI: 10.1016/j.biortech.2021.126463

Abstract

Pretreatment can improve biomass biodegradability. Here, a novel sugarcane bagasse (SCB) pretreatment process based on two-stage ultrasonic assisted dilute H₂SO₄ (TUDA) under mild conditions was reported. After optimization, the pretreatment was shown to significantly degrade hemicellulose (92.40%) and remove lignin (57.41%) of SCB, leading to reduction of inhibitors and an ethanol fermentation efficiency of 93.37% by SSCF under cellulase 10 FPU/g SCB and 30% pretreated SCB loading. Physical characterization revealed that two-stage ultrasonic could better disrupt SCB than traditional ultrasonic by amplifying the collapse effect and synergistically promoting lignin removal through dilute H₂SO₄. Furthermore, xylose was also effectively recovered from pretreatment supernatant by biochar derived from bagasse. This study established a simple and efficient pretreatment process for high value-added recycling of SCB from solid residue to pretreatment liquid.

Keywords: Dilute acid pretreatment; Ethanol fermentation; Sugarcane bagasse; Two-stage ultrasonic; Xylose recovery.

MeSH terms

Cellulose / metabolism
Fermentation
Hydrolysis
Lignin
Saccharum* / metabolism
Ultrasonics
Xylose

Substances

Cellulose
Lignin
bagasse
Xylose