Skip to main content

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 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)