Lund University, Department of Chemical Engineering, P,O, Box 124, SE-221 00 Lund, Sweden.
Biotechnol Biofuels. 2010 Jul 2;3:16. doi: 10.1186/1754-6834-3-16.
Bioethanol can be produced from sugar-rich, starch-rich (first generation; 1G) or lignocellulosic (second generation; 2G) raw materials. Integration of 2G ethanol with 1G could facilitate the introduction of the 2G technology. The capital cost per ton of fuel produced would be diminished and better utilization of the biomass can be achieved. It would, furthermore, decrease the energy demand of 2G ethanol production and also provide both 1G and 2G plants with heat and electricity. In the current study, steam-pretreated wheat straw (SPWS) was mixed with presaccharified wheat meal (PWM) and converted to ethanol in simultaneous saccharification and fermentation (SSF).
Both the ethanol concentration and the ethanol yield increased with increasing amounts of PWM in mixtures with SPWS. The maximum ethanol yield (99% of the theoretical yield, based on the available C6 sugars) was obtained with a mixture of SPWS containing 2.5% water-insoluble solids (WIS) and PWM containing 2.5% WIS, resulting in an ethanol concentration of 56.5 g/L. This yield was higher than those obtained with SSF of either SPWS (68%) or PWM alone (91%).
Mixing wheat straw with wheat meal would be beneficial for both 1G and 2G ethanol production. However, increasing the proportion of WIS as wheat straw and the possibility of consuming the xylose fraction with a pentose-fermenting yeast should be further investigated.
生物乙醇可以由富含糖、富含淀粉的原料（第一代；1G）或木质纤维素（第二代；2G）生产。第二代乙醇与第一代乙醇的融合将有助于引入第二代技术。每生产一吨燃料的资本成本将会降低，并且可以更好地利用生物质。这将减少第二代乙醇生产的能源需求，同时为第一代和第二代工厂提供热能和电力。在本研究中，蒸汽预处理的小麦秸秆（SPWS）与预先糖化的小麦粉（PWM）混合，并在同步糖化发酵（SSF）中转化为乙醇。
随着混合物中 PWM 含量的增加，乙醇浓度和乙醇产量都有所增加。当 SPWS 中含有 2.5%水不溶性固体（WIS），PWM 中含有 2.5% WIS 的混合物中，获得了最大的乙醇产率（基于可用 C6 糖，理论产率的 99%），乙醇浓度为 56.5g/L。该产率高于单独进行 SSF 的 SPWS（68%）或 PWM（91%）的产率。
将小麦秸秆与小麦粉混合对第一代和第二代乙醇生产都将是有益的。然而，应进一步研究增加小麦秸秆中 WIS 的比例以及用戊糖发酵酵母消耗木糖部分的可能性。
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