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Steam explosion pretreatment of rice straw to improve structural carbohydrates anaerobic digestibility for biomethanation

  • Muhammad Abdul Hanan Siddhu
  • Wanwu Li
  • Yanfeng He
  • Guangqing LiuEmail author
  • Chang ChenEmail author
Research Article
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Abstract

Effectiveness of steam explosion (SE) pretreatment for deconstructing the complex structural carbohydrates (SC) and lignin recalcitrance properties of rice straw (RS) for conjunctive improvement of biofuel yield and waste valorization was evaluated. This work exhibited successful pretreatment of RS at a different pressure (1.2, 1.5, and 1.8 MPa) and retention (3, 6, 9, and 12 min) for enhancement of SC contribution to biomethane production. Regression analysis demonstrated that SE pretreatment efficiency improved at high-temperature and short-retention time for biodegradation of RS. Maximum cumulative methane yield (EMY) achieved 254.8 mL/gvs at 1.2 MPa (3 min) of SE-treated RS with 62.7% of very significant improvement compared with untreated RS (156.6 mL/gvs). Furthermore, solid fraction of xylose, arabinose, cellobiose, glucose, and acid-soluble lignin in SE-treated RS of 1.2 MPa (3 min) were biodegraded by 27.4%, 46.4%, 100%, 48.8%, and 14.1%, respectively, after anaerobic digestion. Therefore, SE pretreatment was an encouraging approach for enhancing SC conversion to biomethane and waste resource to circular economy.

Keywords

Rice straw Anaerobic digestion Biodegradation Modeling Recalcitrance Steam explosion Treatment 

Abbreviations

AD

Anaerobic digestion

ASL

Acid-soluble lignin

Bd

Biodegradability

C/N

Carbon to nitrogen ratio

EMY

Maximum cumulative methane yield obtained by experiment

FA

Free ammonia nitrogen

MMY

Theoretical maximum methane potential

MPa

Megapascal

RS

Rice straw

SC

Structural carbohydrates

SE

Steam explosion

TA

Total alkalinity

TS

Total solid

VFA

Volatile fatty acids

VS

Volatile solid

Notes

Acknowledgments

This work was supported by the National Key Research and Development Program of China (2017YFD0800801) and China Scholarship Council.

Supplementary material

11356_2019_5382_MOESM1_ESM.docx (260 kb)
ESM 1 (DOCX 259 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Chemical EngineeringBeijing University of Chemical TechnologyBeijingChina
  2. 2.State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijingChina

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