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A novel simultaneous partial nitritation, denitratation and anammox (SPNDA) process in sequencing batch reactor for advanced nitrogen removal from ammonium and nitrate wastewater
- Source :
- Bioresource technology. 343
- Publication Year :
- 2021
-
Abstract
- 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.
- Subjects :
- Environmental Engineering
Thauera
Nitrogen
Bioengineering
Sequencing batch reactor
Wastewater
chemistry.chemical_compound
Denitrifying bacteria
Ammonia
Bioreactors
Nitrate
Ammonium Compounds
Ammonium
Waste Management and Disposal
Nitrosomonas
Nitrates
biology
Sewage
Renewable Energy, Sustainability and the Environment
General Medicine
biology.organism_classification
chemistry
Anammox
Environmental chemistry
Denitrification
Oxidation-Reduction
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 343
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....49f8836a63ece4685f4fba332e1b9bd6