Utilization of carbohydrates content of paper tube residuals for ethanol production |
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| Authors: | Farid Talebnia Mohammad J Taherzadeh |
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| Institution: | a School of Engineering, University of Borås, 501 90 Borås, Sweden
b Faculty of Chemical Engineering, Noshirvani University of Technology, Babol, Iran |
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| Abstract: | Paper tube residual was utilized as a raw material for ethanol production. The effects of two pretreatment methods namely dilute acid steam explosion (DASE) and concentrate phosphoric acid (CPA) on enzymatic hydrolysis and SSF were studied. Cellulose, lignin, glue (PVA), and xylan were the main components of paper tube accounting for 52%, 20%, 9% and 7% of dry matter, respectively. Presence of PVA delayed the growth of yeast cells but showed no effect on ultimate yield of ethanol. Higher cellulase concentration as well as pretreatments increased hydrolysis rate and ultimate yield of ethanol. Enzymatic hydrolysis of native paper tube for 72 h resulted in 49% of theoretical glucose conversion while pretreatments by DASE and CPA increased this value to 67% and 93%, respectively. The best result of SSF process was from the CPA-pretreated paper tubes with an ethanol yield of 0.42 g/g after 48 h. Under optimal condition, 308 ml ethanol per kg paper tube could be produced. |
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| Keywords: | DM dry matter FPU Filter Paper Units DASE dilute acid steam explosion CPA concentrate phosphoric acid IU international units PVA polyvinyl alcohol SSF simultaneous saccharification and fermentation AIR acid insoluble residue AIL acid insoluble lignin |
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