Effect of microwave/hydrothermal combined ionic liquid pretreatment on straw: Rumen anaerobic fermentation and enzyme hydrolysis

Ziqiang Yu; Hongzhi Ma; Emilia den Boer; Wenyu Wu; Qunhui Wang; Ming Gao; Dai-Viet N Vo; Ming Guo; Changlei Xia

doi:10.1016/j.envres.2021.112453

Effect of microwave/hydrothermal combined ionic liquid pretreatment on straw: Rumen anaerobic fermentation and enzyme hydrolysis

Environ Res. 2022 Apr 1:205:112453. doi: 10.1016/j.envres.2021.112453. Epub 2021 Nov 27.

Authors

Ziqiang Yu¹, Hongzhi Ma², Emilia den Boer³, Wenyu Wu¹, Qunhui Wang¹, Ming Gao¹, Dai-Viet N Vo⁴, Ming Guo⁵, Changlei Xia⁶

Affiliations

¹ Department of Environmental Science and Engineering, University of Science and Technology, Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China.
² Department of Environmental Science and Engineering, University of Science and Technology, Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, 100083, China. Electronic address: mahongzhi@ustb.edu.cn.
³ Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wroclaw, Poland.
⁴ Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, 755 414, Viet Nam.
⁵ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300, China.
⁶ Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China. Electronic address: changlei.xia@njfu.edu.cn.

PMID: 34843726
DOI: 10.1016/j.envres.2021.112453

Abstract

To explore green technology for wheat straw pretreatment, this study combined the microwave or hydrothermal with ionic liquid ([Bmim][OAc]) on wheat straw followed by rumen fermentation. The optimal conditions of microwave assisted ionic liquids pretreatment (M-I) and hydrothermal assisted ionic liquids pretreatment (H-I) treatment were 360 W and 200 °C, and the corresponding lignin removal rates reached 35.3% and 25.4%, respectively. Rumen fermentation showed that the highest volatile fatty acid (VFA) yield was found in M-I group, followed by H-I group at 234 and 180 mg/g, respectively. As for enzymatic hydrolysis, the saccharification rates at 3 days of M-I (360 W) and H-I (200 °C) were determined to be 393 and 320 mg/g. The optimal ionic liquid dosage was determined to be 30% in consideration of cost and VFA conversion rate. M-I pretreatment plus the rumen fermentation enjoyed the benefit of no enzyme addition and high product recovery, which was worth further investigating.

Keywords: Enzyme hydrolysis; Ionic liquids; Rumen fermentation; Straw pretreatment; Volatile fatty acid.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Anaerobiosis
Animals
Fermentation
Hydrolysis
Ionic Liquids*
Microwaves
Rumen

Substances

Ionic Liquids