IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 340-347    Article in Press

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G. Najafpour, A. Farahi and A. A. Ghoreyshi
( Received: December 05, 2017 – Accepted: January 04, 2018 )

Abstract    Broomcorn seed (Sorghum vulgare) was used as raw material for bioethanol production. Optimum conditions obtained from response surface method. Broomcorn seed flour (45 g/l) was treated by alkaline treatment and dual enzymatic hydrolysis (0.7 g/l of α- amylase and 0.42 g/l of amyloglucosidase). The resulted total sugars of 25.5 g/L was used in conventional bioethanol production (8.1 g/l) using Saccharomyce scerevisiae. Enhanced bioethanol production was performed in membrane bioreactor (MBR) with integrated batch fermentation and membrane pervaporation process. Application of commercial PDMS/PET/PI membrane in MBR, resulted in ethanol concentration of 10.15 g/l in broth and 70.2 g/l in cold trap of MBR. Cell concentration in broth has increased from 7.2 in conventional fermentation to 9.05 g/l in MBR. In addition, ethanol production in MBR using fabricated membrane having ethanol separation factor of 8.7; ethanol concentration in broth and cold trap were 11.1 and 88.5 g/ l, respectively. Also the cell concentration of 10.2 g/l was obtained in MBR with fabricated membrane. In MBR, surface modified MWCNT coated on membrane having ethanol separation factor of 10.2, resulted ethanol concentration of 11.9 and 110 g/l in broth and cold trap, respectively. Finally, for MBR using modified membrane the cell concentration of 11.01 g/l was obtained.


Keywords    Bioethanol; MWCNT.PDMS/PES.PVP composite membrane; broomcorn seed


چکیده    We shall do it later for translations.

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