Department of Environmental Engineering, Building 113, Technical University of Denmark, Lyngby 2800, Denmark.
Bioresour Technol. 2010 Jul;101(13):4744-53. doi: 10.1016/j.biortech.2009.11.080. Epub 2009 Dec 23.
Wheat straw is an abundant agricultural residue with low commercial value. An attractive alternative is utilization of wheat straw for bioethanol production. However, production costs based on the current technology are still too high, preventing commercialization of the process. In recent years, progress has been made in developing more effective pretreatment and hydrolysis processes leading to higher yield of sugars. The focus of this paper is to review the most recent advances in pretreatment, hydrolysis and fermentation of wheat straw. Based on the type of pretreatment method applied, a sugar yield of 74-99.6% of maximum theoretical was achieved after enzymatic hydrolysis of wheat straw. Various bacteria, yeasts and fungi have been investigated with the ethanol yield ranging from 65% to 99% of theoretical value. So far, the best results with respect to ethanol yield, final ethanol concentration and productivity were obtained with the native non-adapted Saccharomyses cerevisiae. Some recombinant bacteria and yeasts have shown promising results and are being considered for commercial scale-up. Wheat straw biorefinery could be the near-term solution for clean, efficient and economically-feasible production of bioethanol as well as high value-added products.
麦草是一种丰富的农业废弃物，商业价值低。一个有吸引力的选择是利用麦草生产生物乙醇。然而，基于当前技术的生产成本仍然过高，阻碍了该工艺的商业化。近年来，在开发更有效的预处理和水解工艺方面取得了进展，从而提高了糖的产量。本文的重点是综述麦草预处理、水解和发酵的最新进展。根据所应用的预处理方法的类型，在麦草的酶解后，可获得 74-99.6%的最大理论糖产量。已经研究了各种细菌、酵母和真菌，其乙醇得率范围为理论值的 65%至 99%。到目前为止，在乙醇产量、最终乙醇浓度和生产力方面，具有本土非适应酿酒酵母的效果最好。一些重组细菌和酵母显示出有前途的结果，并被考虑用于商业规模扩大。麦草生物炼制可以作为一种近期的解决方案，用于清洁、高效和经济可行的生物乙醇生产以及高附加值产品的生产。
