Deng Yuanfang, Qiu Ling, Yao Yiqing, Qin Mengyao
College of Mechanical and Electronic Engineering, Northwest A&F University Yangling Shaanxi 712100 China
Northwest Research Center of Rural Renewable Energy Exploitation and Utilization of M.O.A, Northwest A&F University Yangling Shaanxi 712100 China
RSC Adv. 2018 Jun 20;8(40):22643-22651. doi: 10.1039/c8ra03692f. eCollection 2018 Jun 19.
Overcoming the complex three dimensional structure of biomass is a major challenge in enhancing anaerobic digestion (AD) efficacy. Freeze-thaw pretreatment was proposed herein in order to improve methane production from rice straw. The effect was notable: average methane content for group-A (-4 °C) and -B (-20 °C) were A1 (-4 °C, 12 h): 40.0%, A2 (-4 °C, 24 h): 40.5%, A3 (-4 °C, 48 h): 42.2%; B1 (-20 °C, 12 h): 44.2%, B2 (-20 °C, 24 h): 45.7%, B3 (-20 °C, 48 h): 46.0%, the increases were 88.8-99.1% and 108.8-117.2%, respectively, compared with control (CK) (21.2%). Total methane production for group-A and -B were A1: 22.8 mL g TS, A2: 24.7 mL g TS, A3: 27.8 mL g TS; B1: 29.9 mL g TS, B2: 31.3 mL g TS, B3: 32.0 mL g TS, compared with CK (7.6 mL g TS), the increases were 200.0-265.8%, 293.4-321.1%, respectively. The technical digestion time ( ) was shortened by 8 days. Therefore, the maximum methane production was obtained under conditions of -20 °C and 48 h. This study proposed an efficient pretreatment method that broadens the horizon of improving biomass conversion into bioenergy.
克服生物质复杂的三维结构是提高厌氧消化（AD）效率的一项重大挑战。本文提出了冻融预处理以提高稻草的甲烷产量。效果显著：A组（-4℃）和B组（-20℃）的平均甲烷含量分别为A1（-4℃，12小时）：40.0%，A2（-4℃，24小时）：40.5%，A3（-4℃，48小时）：42.2%；B1（-20℃，12小时）：44.2%，B2（-20℃，24小时）：45.7%，B3（-20℃，48小时）：46.0%，与对照组（CK）（21.2%）相比，增幅分别为88.8 - 99.1%和108.8 - 117.2%。A组和B组的总甲烷产量分别为A1：22.8 mL/g TS，A2：24.7 mL/g TS，A3：27.8 mL/g TS；B1：29.9 mL/g TS，B2：31.3 mL/g TS，B3：32.0 mL/g TS，与CK（7.6 mL/g TS）相比，增幅分别为200.0 - 265.8%、293.4 - 321.1%。技术消化时间缩短了8天。因此在-20℃和48小时的条件下获得了最大甲烷产量。本研究提出了一种高效的预处理方法，拓宽了提高生物质转化为生物能源的视野。
