Influence of aeration on bioethanol production from ozonized wheat straw hydrolysates using Pichia stipitis

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• 作者：Carolina Bellido ; Gerardo Gonzá ; lez-Benito ; Mó ; nica Coca ; Susana Lucas ; Marí ; a Teresa Garcí ; a-Cubero ; ^{maite@iq.uva.es} ; ^{mtgcubero@gmail.com}
• 关键词：Aeration ; Bioethanol ; Ozone pretreatment ; Pichia stipitis ; Wheat straw
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：133
• 期：Complete
• 页码：51-58
• 全文大小：389 K

文摘

The influence of aeration on ethanol production by Pichia stipitis was studied in wheat straw hydrolysates subjected to ozone pretreatment for the first time. In a first stage, different aeration rates ranging from 0.03 to 0.50 L air/min, which corresponds to a volumetric oxygen transfer coefficient from 1.1 to 9.6 h^?1, were applied to model glucose/xylose substrates. The most promising value was found to be 3.3 h^?1 (0.1 L air/min) leading to better xylose utilization, an ethanol yield of 0.40 g ethanol/g sugars and complete depletion of sugars at 72 h. In a second stage, the effect of aeration was analyzed in ozonized wheat straw hydrolysates. Sugars were completely depleted at 96 h and ethanol yield reached a value of 0.41 g ethanol/g sugars. The addition of controlled oxygen (K_La = 3.8 h^?1) enhances the efficiency of the process causing an increase of 29.1 % in ethanol production and a considerable reduction of 42.9 % in fermentation time as compared to non-aerated hydrolysates.