Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology, Tsinghua University, Beijing 100084, PR China; Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China.
Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology, Tsinghua University, Beijing 100084, PR China; Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, PR China.
Bioresour Technol. 2019 Mar;275:10-18. doi: 10.1016/j.biortech.2018.12.013. Epub 2018 Dec 7.
In this study, the dilute acid pretreatment combined with ultrasound was applied to improve fermentative hydrogen production from grass. The experimental results indicated that SCOD and soluble carbohydrate contents of grass was improved by 98.6% and 236.9% after the combined treatment, respectively. Surface morphology (SEM and AFM) and crystallinity analysis revealed that the combined pretreatment process could effectively destroyed the biomass structure and increased their surface area. Owing to the increased soluble organics proportion and better enzymatic accessibility of residual solids, the hydrogen yield reached 42.2 mL/g-dry grass after the combined treatment, which was 311.7%, 190.0% and 35.0% higher in comparison with the control, individual ultrasound and acid pretreated groups, respectively. Meanwhile, the combined treatment also increased the substrate utilization efficiency and induced a more efficient fermentation pathway. Bacterial community analysis revealed that more enrichment of Clostridium and less enrichment of Enterococcus contributed to the improved hydrogen production.
在这项研究中，采用稀酸预处理与超声相结合的方法来提高草类物质的发酵产氢性能。实验结果表明，联合处理后草类物质的 SCOD 和可溶性碳水化合物含量分别提高了 98.6%和 236.9%。表面形貌（SEM 和 AFM）和结晶度分析表明，联合预处理过程能够有效破坏生物质结构并增加其表面积。由于可溶有机物比例的增加和残留固体的更好的酶解可及性，联合处理后的氢气产量达到了 42.2 mL/g-干草，分别比对照组、单独超声处理组和酸预处理组提高了 311.7%、190.0%和 35.0%。同时，联合处理还提高了底物利用效率，并诱导了更有效的发酵途径。细菌群落分析表明，产氢菌梭菌的丰度增加，而耗氢菌肠球菌的丰度降低，这有助于提高产氢性能。
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