关键词: 木质生物炭, 粒径, 灰分, 厌氧发酵, 甲烷

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