State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
Bioresour Technol. 2015 Mar;179:407-413. doi: 10.1016/j.biortech.2014.12.050. Epub 2014 Dec 19.
The physicochemical properties of cassava residues subjected to microwave (or steam)-heated acid pretreatment (MHAP or SHAP) were comparatively investigated to improve fermentative hydrogen and methane cogeneration. The hydrogen yield from cassava residues with MHAP and enzymolysis was higher (106.2 mL/g TVS) than that with SHAP and enzymolysis (102.1 mL/g TVS), whereas the subsequent methane yields showed opposite results (75.4 and 93.2 mL/g TVS). Total energy conversion efficiency increased to 24.7%. Scanning electron microscopy images revealed MHAP generated numerous regular micropores (∼6 μm) and SHAP generated irregular fragments (∼23 μm) in the destroyed lignocellulose matrix. Transmission electron microscopy images showed SHAP generated wider cracks (∼0.2 μm) in delaminated cell walls than MHAP (∼0.1 μm). X-ray diffraction patterns indicated MHAP caused a higher crystallinity index (33.00) than SHAP (25.88), due to the deconstruction of amorphous cellulose. Fourier transform infrared spectroscopy indicated MHAP caused a higher crystallinity coefficient (1.20) than SHAP (1.12).
为了提高发酵产氢和甲烷的协同效益，对比研究了微波（或蒸汽）加热酸预处理（MHAP 或 SHAP）后木薯渣的物理化学性质。与经 SHAP 和酶解后的木薯渣相比，经 MHAP 和酶解后的木薯渣的氢气产量更高（106.2 mL/g TVS），而随后的甲烷产量则呈现相反的结果（75.4 和 93.2 mL/g TVS）。总能量转化率提高到 24.7%。扫描电子显微镜图像显示，MHAP 在破坏的木质纤维素基质中产生了许多规则的微孔（约 6 μm），而 SHAP 则产生了不规则的碎片（约 23 μm）。透射电子显微镜图像显示，与 MHAP（约 0.1 μm）相比，SHAP 在分层细胞壁中产生了更宽的裂缝（约 0.2 μm）。X 射线衍射图谱表明，由于无定形纤维素的解构，MHAP 导致更高的结晶度指数（33.00），而 SHAP 则为 25.88。傅里叶变换红外光谱表明，与 SHAP（1.12）相比，MHAP 导致更高的结晶度系数（1.20）。
