Comparison of dry and wet milling pre-treatment methods for improving the anaerobic digestion performance of the Pennisetum hybrid
Comparison of dry and wet milling pre-treatment methods for improving the anaerobic digestion performance of the Pennisetum hybrid
复制标题
DOI：
10.1039/c6ra27822a
复制
发表时间：
2017-02
期刊：
影响因子：
3.9
通讯作者：
Dong Pengyu;Li Lianhua;Zhen Feng;Kong Xiaoying;Sun Yongming;Z. Yi
中科院分区：
文献类型：
--
作者：
Dong Pengyu;Li Lianhua;Zhen Feng;Kong Xiaoying;Sun Yongming;Z. Yi
采用两种不同的粉碎预处理方法，研究其对杂交狼尾草厌氧消化性能的影响。两种碾磨预处理方法均能显著破坏杂交狼尾草的物理结构。随着处理时间的延长，杂交狼尾草的孔容、比表面积、平均孔径和结晶指数逐渐增大。厌氧发酵试验表明，在干磨和湿磨预处理中，干磨预处理3h的比甲烷产率最高（358.07 mL g−1 VS）和湿磨6 h预处理的草（315.87 mL g−1），分别比未处理的杂交狼尾草（253.88 mL g−1 VS）提高了41.04%和24.42%。干磨处理3h和湿磨处理6h后，杂交狼尾草的中位直径（D50）分别比未处理的杂交狼尾草降低了25.28%和22.36%。经过湿磨预处理后，杂交狼尾草的流动性比传统的“粉碎”预处理好得多，这可能会使大型沼气工程的饲养更容易。因此，良好的流动性和研磨预处理程度的优化可以在未来的工业规模上应用。
Two types of milling pre-treatment methods were used to study their effects on the anaerobic digestion performance of the Pennisetum hybrid. The physical structure of the Pennisetum hybrid could be significantly damaged with both milling pre-treatment methods. With an increase in treatment time, the pore volume, surface area, average pore diameter, and the crystallization index of the Pennisetum hybrid increased gradually. The anaerobic fermentation test showed that, among the dry and wet milling pre-treatments, the highest specific methane yield was obtained at 3 h dry milling pre-treated (358.07 mL g−1 VS) and 6 h wet milling pre-treated grass (315.87 mL g−1), which was 41.04% and 24.42% higher than that of the untreated Pennisetum hybrid (253.88 mL g−1 VS). The median diameter (D50) of the Pennisetum hybrid was 25.28% and 22.36% lower than that of the untreated Pennisetum hybrid after 3 h dry and 6 h wet milling pre-treatment. After wet milling pre-treatment, the fluidity of the Pennisetum hybrid was much better than conventional “smashing” pre-treatment, which may make feeding easier in large-scale biogas projects. Good fluidity and optimization of the degree of milling pre-treatment could, therefore, be applied on an industrial scale in the future.