Review and perspectives of enhanced volatile fatty acids production from acidogenic fermentation of lignocellulosic biomass wastes

Sun, Jiachen; Zhang, Le; Loh, Kai-Chee

doi:10.1186/s40643-021-00420-3

Bioresources and Bioprocessing

Table 3 Pretreatment of lignocellulosic biomass

From: Review and perspectives of enhanced volatile fatty acids production from acidogenic fermentation of lignocellulosic biomass wastes

Pretreatment	Substrates	Conditions	Conclusion	Advantages and suggestion	References
Mill and liquid digestate soaking	Wheat husk	2–8 mm, soaked for 1–5 days	The yields were similar of different size-reduction for 5-day soaking	Co-pretreatment to off-set the cost for particle size reduction	Sun et al. (2019)
Microwave-alkali	Olive	200–700 W for 2 min, 4% NaOH for 4 h	Co-pretreatment shortened the hydrolysis, but not further enhanced VFA yield	Feasible for short HRT fermentation	Elalami et al. (2020)
Hydrothermal	Corn stover	170–230 °C for 5–60 min	Highly rely on temperature than duration time	Low temperature hydrothermal was feasible, but longer duration needed	Saha et al. (2013)
Hydrothermal	Rice straw	90–130 °C for 15 min	VFA yield improved by 38%; low temperature hydrothermal was effective		Xiang et al. (2021)
Hydrothermal	Corn stover	50 °C for 24 h	31% yield enhancement; low temperature hydrothermal was effective		Yuan et al. (2019)
Alkaline H₂O₂	Crop stalks	1–5% H₂O₂ at pH 11.5	Remove 30–40% lignin and increase 8% digested fraction	Clean pretreatment and Zero residues	Sun et al. (2015)
Microwave- H₂O₂	Forest waste	2.5 M H₂O₂ at 400 W	Increase 12% cellulose release compared to mono- H₂O₂ pretreatment		Camani et al. (2020)
UV-H₂O₂	Sisal waste	0.1 g H₂O₂/g Substrate, UV for 6 h	Led to delignification rate of 76.6%, increasing by 25% than mono-H₂O₂ pretreatment		Yang et al. (2018)
Liquid digestate soaking	Wheat husk	Soaked for 5 days, open air	Increased 30% yield	Cost-saving, digestate recycle	Sun et al. (2019)
Liquid digestate soaking	Wheat straw	Soaked for 5 days, open air	Ammonia in digestate functioned	Cost-saving, digestate recycle	Liu et al. (2019a)
Lignocellulose fractionization	Wood pellets	18% (w/w) alkali, 100psi O₂ for 6 h	Remove 52% lignin	Lignocellulose fractionization for valorization	Song et al. (2019a, b)
Deep eutectic solvents	Wood	120 °C for 2 h	Remove high to 78% lignin		Alvarez-Vasco et al. (2016)
Deep eutectic solvents	Wheat straw	110 °C for 2 h	Hydrolyzed 90% cellulose and 71% xylan		Liu et al. (2019b)
Deep eutectic solvents	Wood shavings	130 °C for 3 h	Remove 79% lignin		Tian et al. (2020)

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