Abstract:In order to explore the alleviating effect of biochar on nitrate accumulation in anammox process, the effect of biochar at different pyrolysis temperatures (300, 500 and 700℃) on nitrogen removal performance of anammox system was investigated. The results showed that the total nitrogen removal rate was increased by 14.6%, 7.1% and 3.3%, respectively, after the addition of 300, 500 and 700℃ biochar compared with the control group. The main reason was that biochar promoted the reduction of nitrate as an electronic mediator, and the reduction product continued to participate in the anammox reaction to further reduced the residual ammonia nitrogen by 11.2%, 9.1% and 5.8%. The surface of biochar at 300℃ was rich in electron-losing groups such as phenols, aldehydes and ketones, and its electron-donating capacity was 2.64mmol e-/g, which was higher than 500℃ (1.92mmol e-/g) and 700℃ (1.32mmol e-/g), so the electron transfer was better strengthened. Microbial community and functional protein analysis showed that the abundance of Ca.Kuenenia, Pseudomonas and Thauera were enhanced by the addition of biochar, which was beneficial to the enrichment of Anammox and denitrifying bacteria. Meanwhile, biochar enhanced nitrogen metabolism during denitrification by promoting the expression of NapA (EC:1.9.6.1) and NarG (EC:1.7.5.1) functional genes.
付静薇, 贾紫雯, 杨晓欢, 贺逸飞, 李倩. 热解温度对生物炭提升厌氧氨氧化性能的影响[J]. 中国环境科学, 2022, 42(12): 5695-5702.
FU Jing-wei, JIA Zi-wen, YANG Xiao-huan, HE Yi-fei, LI Qian. Effect of pyrolysis temperature for biochar on improving nitrogen removal efficiency of Anammox. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5695-5702.
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