A Steam-Explosion-Based Hydrolysis and Acidification Technology for Cornstalk Bioconversion
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Acidification is a potential solution to lignocellulose conversion. In this work, steam explosion was proposed to pretreat cornstalk and improve acidification bioconversion efficiency. Results showed that steam explosion improved the conversion ratio by 17% compared with the control group. The optimum temperature of the hydrolysis and acidification system was 50 °C and the microbial community showed higher hydrolysis and acidification efficiency at pH 8.0–9.0, which were 66.0% (pH 8.0) and 68.0% (pH 9.0), respectively. An organic nitrogen source was more preferred by the microbial community than an inorganic nitrogen source. The highest conversion ratio (67.0%) was observed when the yeast extract dose was 1.0 g/L. Steam-exploded cornstalk was degraded by the microbial community, and organic acids in hydrolysis and acidification liquid was effectively reused by R. eutropha H16 (The utilization ratios of acetic acid, propionic acid and butyric acid were 53.38, 12.27 and 20.95%, respectively.). Based on this study, steam-explosion-based conversion technology is proposed and has great potential in future application of lignocellulose conversion.
KeywordsSteam explosion Hydrolysis and acidification Process regulation Cornstalk
The authors gratefully acknowledge the financial support from the Transformational Technologies for Clean Energy and Demonstration (Strategic Priority Research Program of the Chinese Academy of Sciences, grant no. XDA 21060300), the Special Project of Cultivation and Development of Innovation Base of Beijing (grant no. Z171100002217003), and the Equipment Project of the State Key Laboratory of Biochemical Engineering (grant no. Y826051101) in this work.
- 1.Chen HZ (2014) Biotechnology of lignocellulose. Springer, Netherlands, pp 403–510Google Scholar
- 2.Bosch SVD, Schutyser W, Vanholme R, Driessen T, Koelewijn SF, Renders T, Meester BD, Huijgen WJJ, Dehaen W, Courtin MC (2015) Reductive lignocellulose fractionation into soluble lignin-derived phenolic monomers and dimers and processable carbohydrate pulps. Energy Environ Sci 8(6):1748–1763CrossRefGoogle Scholar
- 18.Scarlata C, Sluiter J, Templeton D, Crocker D (2011) Determination of structural carbohydrates and lignin in biomass. National Renewable Energy Laboratory-NREL/TP-510-42618 Laboratory Analytical Procedure (LAP) Golden, COGoogle Scholar
- 20.Chen HZ (2013) Technology of steam explosion and biorefining. Springer, Netherlands, pp 35–37Google Scholar