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- Title
Minimization of N 2 O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism.
- Authors
Liu, Tang; Liu, Shufeng; He, Shishi; Tian, Zhichao; Zheng, Maosheng
- Abstract
To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01–0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants.
- Subjects
SEQUENCING batch reactor process; BATCH reactors; NITROGEN removal (Sewage purification); SEWAGE disposal plants; WASTEWATER treatment; POLYMERASE chain reaction; NITROUS oxide
- Publication
Water (20734441), 2021, Vol 13, Issue 2, p210
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w13020210