Shockwave and alkali treatment were combined to enhance the digestibility of corn stover. Initial shock pressure, hydroxide concentration, alkali treatment temperature, and alkali treatment time were investigated to determine their effects on digestibility. Orthogonal experiments were conducted to find the optimal conditions for digestibility. After performing shock and alkali pretreatment adding 2 mg/g （enzyme/straw） cellulase and hemicellulase respectively, the corn stover was enzymatically hydrolyzed for 5 days, and then the sugar concentration were measured with HPLC for calculating the digestibility. The results show that alkali treatment temperature has the greatest effect on digestibility followed by hydroxide concentration, alkali treatment time and initial shock pressure. A maximum digestibility of 0.643 is found under the following conditions： 550 kPa of initial shock pressure, 8% OH-, 100 ℃ of alkali treatment temperature, and 60 minutes of caustic treatment time. The digestibility of corn stover treated with shockwave and alkali can be increased by 8%-12% compared with that treated with alkali alone.
Key words
biomass energy /
shockwave treatment /
alkaline pretreatment /
enzymatic hydrolysis /
digestibility /
lignocellulose /
corn stover
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References
[1] DALE B, HOLTZAPPLE M.The need for biofuels[J]. Chemical engineering progress, 2015, 111(3): 36-40, 35.
[2] 杨为华, 李凤和. 常压法秸秆预处理技术研究进展[J].化工进展, 2017, 36(3): 873-880.
YANG W H, LI F H.Research progress on pretreatment techniques of straw at atmospherics pressure[J]. Chemical industry and engineering progress, 2017, 36(3): 873-880.
[3] KUMAR P, BARRETT D M, DELWICHE M J, et al.Methods for pretreatment of lignocellulosic biomass for efficient hydrolysis and biofuel production[J]. Industrial and engineering chemistry research, 2009, 48(8): 3713-3729.
[4] PATRICIA F A, MARCUS B S, FORTER G.Evaluation of the chemical composition of a mixture of sugarcane bagasse and straw after different pretreatments and their effects on commercial enzyme combinations for the production of fermentable sugars[J]. Biomass and bioenergy, 2018, 116: 180-188.
[5] PABLO A, ELIA T P, MERCEDES B, et al.Pretreatment technologies for an efficient bioethanol product on process based on enzymatic hydrolysis:a review[J]. Bioresource technology, 2010, 101(13): 4851-4861.
[6] 熊代余, 汪旭光, 田瑞齐, 等. 木质纤维物料的爆炸冲击裂解预处理新方法[J]. 纤维素科学与技术, 1998, 6(4): 21-27.
XIONG D Y, WANG X G, TIAN R Q, et al.A new method for pretreatment of ligocellulose material by explosive shock[J]. Journal of cellulose science and technology, 1998, 6(4): 21-27.
[7] BOND A, RUGHOONUNDUN H, PEERSEN E, et al.Shock treatment of corn stover[J]. Biotechnol progress, 2017, 33: 815-827.
[8] FALLS M, MADISON M, LIANG C, et al, Mechanical pretreatment of biomass-part II: shock treatment[J]. Biomass and bioenergy, 2019, 126: 47-56.
[9] LIANG C, LONKAR S, DARVEKAR P,et al.Countercurrent enzymatic saccharification of pretreated corn stover. part 2: lime+shock pretreated corn stover and commercial approach[J]. Biomass and bioenergy, 2017, 97: 43-52.
[10] VOCHOZKA M, MAROUSKOVA A.Assessment of shockwave pretreatment in biomass processing[J]. Energy sources, 2017, 39(11): 1195-1199.
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