Journal
BIORESOURCE TECHNOLOGY
Volume 343, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126105
Keywords
Biological nitrogen removal; Simultaneous partial nitritation; Denitratation and anammox (SPNDA); Low dissolved oxygen; Ammonium and nitrate wastewater; Microbial dynamics
Funding
- National Natural Science Foundation of China [51578353, 51808367]
- Program for Professor of Special Appointment (Eastern Scholar) [TP2019020]
- Shanghai Pujiang Talent Program [19PJ1402600]
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This study proposed a novel simultaneous partial nitritation, denitratation and anammox process for efficient total nitrogen removal. Controlling aerobic duration and dissolved oxygen concentration could enhance microbial activity and stable suppression of nitrite-oxidizing bacteria.
This study presented a novel simultaneous partial nitritation (PN), denitratation and anammox (SPNDA) process for treating ammonium and nitrate wastewater. Results indicated that SPNDA could achieve a great total nitrogen (TN) removal of 97.6 +/- 0.5%, leading to effluent TN concentration of only 3.4 mg/L. Mass balance indicated that nitrogen removal rates via anammox, simultaneous nitrification and denitrification were 96.7% and 3.3%, respectively. Extended aerobic duration (12 h) and low dissolved oxygen (DO) concentration (0.15 mg/L) could improve ammonia-oxidizing bacteria (AOB) activity and maintain PN stability. The stable suppression of nitrite-oxidizing bacteria activity was attributed to the low DO (0.15 mg/L) and high free ammonia (3.63 mg/L) in SPND. Besides, the nitrogen conversion mechanisms for SPNDA were revealed based on a typical operational cycle. Microbial analysis showed that AOB (Nitrosomonas) and partial denitrifying bacteria (Thauera and Denitratisoma) coexisted with anammox bacteria (Candidatus Brocadia and Candidatus Anammoxoglobus) in the mixotrophic bio-community.
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