Simultaneous concentration and detoxification of lignocellulosic hydrolyzates by vacuum membrane distillation coupled with adsorption.
Low sugar concentration and the presence of various inhibitors are the major challenges associated with lignocellulosic hydrolyzates as a fermentation broth. Vacuum membrane distillation (VMD) process can be used to concentrate sugars and remove inhibitors (furans) efficiently, but it's not desirable for the removal of less volatile inhibitors such as acetic acid. In this study, a VMD-adsorption process was proposed to improve the removal of acetic acid, achieving simultaneous concentration and detoxification of lignocellulosic hydrolyzates by one step process. Results showed that sugars were concentrated with high rejections (>98%) and little sugar loss (<2%), with the significant reduction in nearly total furans (99.7%) and acetic acid (83.5%) under optimal operation conditions. Fermentation results showed the ethanol production of hydrolyzates concentrated and detoxified using the VMD-adsorption method were approximately 10-fold greater than from untreated hydrolyzates.
Key Laboratory of Biomass Chemical Engineering of MOE, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Yaqin
Y
Zhang
Xi'an High-Tech Institute, Xi'an 710025, China.
Ming
M
Li
Key Laboratory of Biomass Chemical Engineering of MOE, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Yafei
Y
Wang
Ocean College, Zhejiang University, Hangzhou 310058, China.
Xiaosheng
X
Ji
Key Laboratory of Biomass Chemical Engineering of MOE, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: linzhang@zju.edu.cn.
Lin
L
Zhang
Key Laboratory of Biomass Chemical Engineering of MOE, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China; Xi'an High-Tech Institute, Xi'an 710025, China.
Lian
L
Hou
D019342:Acetic Acid; D000327:Adsorption; D056804:Biofuels; D057168:Distillation / Q000379:methods*; D000431:Ethanol / Q000737:chemistry; D005285:Fermentation; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry*; D014618:Vacuum
D056804:Biofuels; D000431:Ethanol; D008031:Lignin; D019342:Acetic Acid
Adsorption; Concentration; Detoxification; Lignocellulosic hydrolyzate; Vacuum membrane distillation