TY - JOUR
T1 - Methanation and chemolitrophic nitrogen removal by an anaerobic membrane bioreactor coupled partial nitrification and Anammox
AU - Li, Qian
AU - Hou, Zhaoyang
AU - Huang, Xingyuan
AU - Yang, Shuming
AU - Zhang, Jinfan
AU - Fu, Jingwei
AU - Li, Yu You
AU - Chen, Rong
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 52070148 and 52270049), the Shaanxi Provincial Key Program for Science and Technology Development (China) (No.2022KWZ-25), and the Japan Society for the Promotion of Science (No. P20794).
Publisher Copyright:
© 2022, Higher Education Press.
PY - 2023/6
Y1 - 2023/6
N2 - An AnMBR-PN/A system was developed for mainstream sewage treatment. To verify the efficient methanation and subsequent chemolitrophic nitrogen removal, a long-term experiment and analysis of microbial activity were carried out. AnMBR performance was less affected by the change of hydraulic retention time (HRT), which could provide a stable influent for subsequent PN/A units. The COD removal efficiency of AnMBR was > 93% during the experiment, 85.5% of COD could be recovered in form of CH4. With the HRT of PN/A being shortened from 10 to 6 h, nitrogen removal efficiency (NRE) of PN/A increased from 60.5% to 80.4%, but decreased to 68.8% when the HRTPN/A further decreased to 4 h. Microbial analysis revealed that the highest specific ammonia oxidation activity (SAOA) and the ratio of SAOA to specific nitrate oxidation activity (SNOA) provide stable NO2−-N/NH4+-N for anammox, and anammox bacteria (mainly identified as Candidatus Brocadia) enriched at the bottom of Anammox-UASB might play an important role in nitrogen removal. In addition, the decrease of COD in Anammox-UASB indicated partial denitrification occurred, which jointly promoted nitrogen removal with anammox. [Figure not available: see fulltext.]
AB - An AnMBR-PN/A system was developed for mainstream sewage treatment. To verify the efficient methanation and subsequent chemolitrophic nitrogen removal, a long-term experiment and analysis of microbial activity were carried out. AnMBR performance was less affected by the change of hydraulic retention time (HRT), which could provide a stable influent for subsequent PN/A units. The COD removal efficiency of AnMBR was > 93% during the experiment, 85.5% of COD could be recovered in form of CH4. With the HRT of PN/A being shortened from 10 to 6 h, nitrogen removal efficiency (NRE) of PN/A increased from 60.5% to 80.4%, but decreased to 68.8% when the HRTPN/A further decreased to 4 h. Microbial analysis revealed that the highest specific ammonia oxidation activity (SAOA) and the ratio of SAOA to specific nitrate oxidation activity (SNOA) provide stable NO2−-N/NH4+-N for anammox, and anammox bacteria (mainly identified as Candidatus Brocadia) enriched at the bottom of Anammox-UASB might play an important role in nitrogen removal. In addition, the decrease of COD in Anammox-UASB indicated partial denitrification occurred, which jointly promoted nitrogen removal with anammox. [Figure not available: see fulltext.]
KW - Anaerobic membrane bioreactor
KW - Carbon separation
KW - Chemolitrophic nitrogen removal
KW - Partial nitrification/Anammox
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U2 - 10.1007/s11783-023-1668-2
DO - 10.1007/s11783-023-1668-2
M3 - Article
AN - SCOPUS:85144814780
SN - 2095-2201
VL - 17
JO - Frontiers of Environmental Science and Engineering
JF - Frontiers of Environmental Science and Engineering
IS - 6
M1 - 68
ER -