Department of Biological Systems Engineering, Washington State University, Pullman, WA, USA.
Department of Biological Systems Engineering, Washington State University, Pullman, WA, USA.
J Environ Manage. 2017 May 15;193:423-429. doi: 10.1016/j.jenvman.2017.02.025. Epub 2017 Feb 23.
Failure of methane yield is common for anaerobic digestion (AD) of "weak-acid/acid" wastes alone. In order to verify the importance of pH of materials on the process performance and the methane yield, the "weak-base" wastes-poplar wastes (PW) were used as substrate of solid-state AD (SS-AD). The results show that PW could be used for efficient methane yield after NaOH treatment, the total methane yield was 81.1 L/kg volatile solids (VS). PW also could be used for anaerobic co-digestion with high-pH cattle slurry (CM). For the group with NaOH pretreatment, time used for reaching stable state was 2 days earlier than that of the group without NaOH pretreatment. The maximal methane yield of 98.2 L/kg VS was obtained on conditions of 1:1 of PW-to-CM (P/C) ratio and NaOH pretreatment, which was 21.1% (p < 0.05) higher than that of PW. The maximal reductions of total solids (TS), VS, cellulose and hemicellulose were 51.3%, 57.5%, 46.0% and 47.0%, respectively, which were associated with the maximal methane yield. The results indicate that PW could be alone used for efficient SS-AD for methane yield after NaOH treatment.
单独进行“弱酸/酸性”废物的厌氧消化（AD）时，甲烷产量往往会失败。为了验证物料 pH 值对工艺性能和甲烷产量的重要性，将“弱碱”废物-杨木废物（PW）用作固态 AD（SS-AD）的底物。结果表明，PW 经 NaOH 处理后可用于高效产甲烷，总甲烷产量为 81.1 L/kg 挥发性固体（VS）。PW 也可用于高 pH 值牛粪浆（CM）的厌氧共消化。对于进行 NaOH 预处理的组，达到稳定状态所需的时间比没有进行 NaOH 预处理的组早 2 天。在 PW-to-CM（P/C）比为 1:1 且进行 NaOH 预处理的条件下，获得了 98.2 L/kg VS 的最大甲烷产量，比 PW 提高了 21.1%（p<0.05）。总固体（TS）、VS、纤维素和半纤维素的最大减少量分别为 51.3%、57.5%、46.0%和 47.0%，这与最大甲烷产量有关。结果表明，PW 经 NaOH 处理后可单独用于高效 SS-AD 以获得甲烷产量。
