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Wang W, Jiang T, Wang S, Wang L, Li Z, Li W, Wang B. Low alkalinity, free ammonia, and free nitrous acid cooperatively stabilize partial nitrification under excessive aeration condition. Chemosphere 2024; 352:141447. [PMID: 38360413 DOI: 10.1016/j.chemosphere.2024.141447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/27/2024] [Accepted: 02/10/2024] [Indexed: 02/17/2024]
Abstract
In this study, a lab-scale sequencing batch reactor (SBR) was established to assess the feasibility of maintaining partial nitrification in treating high-ammonium wastewater under the condition of excessive aeration (1 L/min, 1289 min). Results showed that the average ammonia (NH4+-N) removal efficiency (ARE) was 93.4 ± 2.7% and the average nitrite accumulation ratio (NAR) was 90.7 ± 2.8% during 15-50 d. In a typical cycle, free ammonia (FA) and free nitrous acid (FNA) alternately inhibited the activity of nitrite oxidizing bacteria (NOB), while low alkalinity limited further nitrification at even excessive aeration. Metagenomic analysis revealed that the relative abundance of Nitrosomonas, as the ammonia oxidizing bacteria (AOB), was up to 1.61%, while NOB were not detected. Taken together, this study indicated partial nitrification was almost not affected by excessive aeration, demonstrating its robustness depending on the cooperative strategy of the low alkalinity limitation and the inhibition of FA and FNA.
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Affiliation(s)
- Wen Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Tan Jiang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Shuo Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Lu Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Zhiyuan Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Wenjie Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Bo Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China.
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