College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Bioresour Technol. 2018 Jan;247:147-156. doi: 10.1016/j.biortech.2017.09.065. Epub 2017 Sep 11.
The rumen digested residue of rice straw contains high residual carbohydrates, which makes it a potential cellulosic ethanol feedstock. This study evaluated the feasibility and effectiveness of applying microwave assisted alkali (MAP), ultrasound assisted alkali (UAP), and ball milling pretreatment (BMP) to enhance ethanol production from two digested residues (2.5%-DR and 10%-DR) after rumen fluid digestion of rice straw at 2.5% and 10.0% solid content. Results revealed that 2.5%-DR and 10%-DR had a cellulose content of 36.4% and 41.7%, respectively. MAP and UAP improved enzymatic hydrolysis of digested residue by removing the lignin and hemicellulose, while BMP by decreasing the particle size and crystallinity. BMP was concluded as the suitable pretreatment, resulting in an ethanol yield of 116.65 and 147.42mgg for 2.5%-DR and 10%-DR, respectively. The integrated system including BMP for digested residue at 2.5% solid content achieved a maximum energy output of 7010kJkg.
稻草瘤胃消化残渣含有高残留碳水化合物，使其成为潜在的纤维素乙醇原料。本研究评估了微波辅助碱（MAP）、超声辅助碱（UAP）和球磨预处理（BMP）在 2.5%和 10.0%固含量下瘤胃液消化稻草后两种消化残渣（2.5%-DR 和 10%-DR）中提高乙醇产量的可行性和效果。结果表明，2.5%-DR 和 10%-DR 的纤维素含量分别为 36.4%和 41.7%。MAP 和 UAP 通过去除木质素和半纤维素来提高消化残渣的酶解效率，而 BMP 通过减小粒径和结晶度来提高酶解效率。BMP 被认为是合适的预处理方法，2.5%-DR 和 10%-DR 的乙醇得率分别为 116.65 和 147.42mgg。对于 2.5%固含量的消化残渣，包括 BMP 的集成系统实现了 7010kJkg 的最大能量输出。
