Abstract: To explore wood biochar on the influence of anaerobic fermentation, corn stalk and cow dung were used as fermentation substrate, and shrub biochar, poplar biochar and mixed sawdust biochar were used as additives. By changing the key factors such as biochar type, particle size and ash content, batch anaerobic fermentation was studied. The results showed that: biochar had an important effect on anaerobic fermentation system, and the smaller the particle size of biochar, the stronger the gas production capacity. Among them, the addition of poplar biochar had the greatest impact on the anaerobic fermentation system, which not only increased the cumulative production of methane (4.9%), maximum methane daily production rate (15.0%) and hydrolysis rate (15.6%) of the anaerobic fermentation system, but also shortened the fermentation lag phase.  In addition, the ash content of poplar biochar also had an important effect on anaerobic fermentation. When the ash content was 2.6 g·L^-1, it had the greatest impact on the anaerobic fermentation system. While improved the buffer capacity of the anaerobic fermentation system and the maximum methane production rate (14.4%), the  lag phase (11.8%) was also shortened. The higher or lower ash content was not conducive to the production of methane in the system.

Key words: wood biochar, particle size, ash, anaerobic fermentation, methane

摘要： 为研究木质生物炭对厌氧发酵产甲烷性能的影响，以玉米秸秆、牛粪作为发酵底物，以灌木生物炭、杨木生物炭、混合木屑生物炭作为添加剂，通过控制生物炭的种类、粒径以及灰分含量等关键因素，进行了批式厌氧发酵强化试验。结果表明：生物炭对厌氧发酵系统有重要影响，且粒径越小，产气能力越强。其中，杨木生物炭对厌氧发酵系统影响最大，不仅提升了厌氧发酵系统的甲烷累积产量（4.9%）、最大甲烷日产率（15.0%）以及水解速率（15.6%），也缩短了发酵延滞期。此外，杨木生物炭的灰分含量对厌氧发酵也有重要影响。当灰分含量为2.6 g·L^-1时，对厌氧发酵系统影响最大，在提升厌氧发酵系统的缓冲能力、最大甲烷日产率（14.4%）的同时，也缩短了延滞期（11.8%），灰分含量过高或过低均不利于系统产甲烷。

关键词: 木质生物炭, 粒径, 灰分, 厌氧发酵, 甲烷