The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition
The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition
复制标题
添加稻壳生物炭在高负荷条件下甜高粱厌氧消化中的作用
DOI：
10.1016/j.btre.2020.e00515
复制
发表时间：
2020
影响因子：
--
通讯作者：
Xu Kai-Qin
中科院分区：
文献类型：
--
作者：
Ma Haiyuan;Hu Yong;Kobayashi Takuro;Xu Kai-Qin
生物炭是由生物质热解过程制成的富碳产物。近年来，生物炭在厌氧消化过程中作为pH稳定剂、微生物载体和种间电子传递等功能引起了人们的关注。本研究通过批量试验考察了添加稻壳生物炭对高粱厌氧消化的影响。在高料液比条件下，pH值明显下降，挥发性脂肪酸（VFA）积累明显。添加15 g/L生物炭可使高粱最大产甲烷速率提高25%，滞后期缩短44%。生物炭浓度进一步增加几乎没有影响。生物炭的加入使反应器的碱度增加，从而促进了反应器性能的提高。在中性pH条件下，添加生物炭对乙酸、丙酸和丁酸的降解促进作用不明显。
Biochar is a carbon rich product made from the biomass pyrolysis process. Recently, biochar addition in anaerobic digestion processes has attracted attention for its possible functions to act as pH stabilizing agent, microbial carrier, and interspecies electron transfer. In this study, the effects of rice husk biochar addition in sorghum anaerobic digestion were investigated in batch tests. Under high F/M (food to microorganism) ratio conditions, obvious pH decreases and volatile fatty acids (VFA) accumulation was observed. Addition of 15 g/L biochar was found effective to increase the sorghum maximum methane production rate by 25 % and shorten the lag phase time by 44 %. Further biochar concentration increase showed little effects. Alkalinity increase brought by biochar addition contributed to the performance enhancement. Moreover, the promotive effects of biochar addition on degradation of acetic acid, propionic and butyric acid were not obvious under neutral pH conditions.