Department of Food, Agricultural, and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, USA.
Bioresour Technol. 2011 Oct;102(19):8828-34. doi: 10.1016/j.biortech.2011.07.005. Epub 2011 Jul 14.
Previous studies have shown that alkali pretreatment prior to anaerobic digestion (AD) can increase the digestibility of lignocellulosic biomass and methane yield. In order to simplify the process and reduce the capital cost, simultaneous alkali treatment and anaerobic digestion was evaluated for methane production from fallen leaves. The highest methane yield of 82 L/kg volatile solids (VS) was obtained at NaOH loading of 3.5% and substrate-to-inoculum (S/I) ratio of 4.1. The greatest enhancement in methane yield was achieved at S/I ratio of 6.2 with NaOH loading of 3.5% which was 24-fold higher than that of the control (without NaOH addition). Reactors at S/I ratio of 8.2 resulted in failure of the AD process. In addition, increasing the total solid (TS) content from 20% to 26% reduced biogas yield by 35% at S/I ratio of 6.2 and NaOH loading of 3.5%. Cellulose and hemicellulose degradation and methane yields are highly related.
先前的研究表明，在进行厌氧消化（AD）之前进行碱预处理可以提高木质纤维素生物质的可消化性和甲烷产量。为了简化工艺并降低资本成本，评估了同步碱处理和厌氧消化落叶产甲烷的效果。在 NaOH 负荷为 3.5%和底物-接种物（S/I）比为 4.1 的条件下，获得了 82 L/kg 挥发性固体（VS）的最高甲烷产量。在 S/I 比为 6.2 且 NaOH 负荷为 3.5%的条件下，甲烷产量的最大提高幅度达到了 24 倍，高于对照（未添加 NaOH）。S/I 比为 8.2 的反应器导致 AD 过程失败。此外，在 S/I 比为 6.2 和 NaOH 负荷为 3.5%的条件下，将总固体（TS）含量从 20%增加到 26%，沼气产量减少了 35%。纤维素和半纤维素的降解与甲烷产量密切相关。
