Enhanced ethanol fermentation in a pervaporation membrane bioreactor with the convenient permeate vapor recovery.
A continuous and closed-circulating fermentation (CCCF) system with a pervaporation membrane bioreactor was built for ethanol fermentation without a refrigeration unit to condense the permeate vapor. Two runs of experiment with a feature of complete and continuous coupling of fermentation and pervaporation were carried out, lasting for 192h and 264h, respectively. The experimental measurement indicated that the enhanced fermentation could be achieved with additional advantages of convenient permeate recovery and energy saving of the process. During the second experiment, the average cell concentration, glucose consumption rate, ethanol productivity, ethanol yield and total ethanol amount produced reached 19.8gL(-1), 6.06gL(-1)h(-1), 2.31gL(-1)h(-1), 0.38, and 609.8gL(-1), respectively. During the continuous fermentation process, ethanol removal in situ promoted the cell second growth obviously, but the accumulation of the secondary metabolites in the broth became the main inhibitor against the cell growth and fermentation.
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
Senqing
S
Fan
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China. Electronic address: mgch@scu.edu.cn.
Zeyi
Z
Xiao
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
Yan
Y
Zhang
Biogas Institute of Ministry of Agriculture, 610041 Chengdu, China.
Xiaoyu
X
Tang
College of Chemistry and Chemical Engineering, Southwest Petroleum University, 610500 Chengdu, China.
Chunyan
C
Chen
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
Weijia
W
Li
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
Qing
Q
Deng
School of Chemical Engineering, Sichuan University, 610065 Chengdu, China.
Peina
P
Yao
D056804:Biofuels; D019149:Bioreactors; D004129:Dimethylpolysiloxanes; D000431:Ethanol / Q000302:isolation & purification* / Q000378:metabolism; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D008567:Membranes, Artificial; D013997:Time Factors
D056804:Biofuels; D004129:Dimethylpolysiloxanes; D008567:Membranes, Artificial; D000431:Ethanol; C013830:baysilon; D005947:Glucose
CCCF system; Ethanol fermentation; Permeate vapor recovery; Pervaporation membrane bioreactor