| Issue |
E3S Web Conf.
Volume 617, 2025
2024 International Conference on Environment Engineering, Urban Planning and Design (EEUPD 2024)
|
|
|---|---|---|
| Article Number | 01010 | |
| Number of page(s) | 5 | |
| Section | Multi-dimensional Study on Ecological Environment and Resource Utilisation | |
| DOI | https://doi.org/10.1051/e3sconf/202561701010 | |
| Published online | 21 February 2025 | |
Impact of Dissolved Oxygen Limiting Strategies on the Simultaneous Partial Nitrification, Anammox and Denitrification (SNAD) Process
1 School of Environmental Scienece and Engineering, Xiamen University of Technology, Xiamen 361024, China
2 Wanjia Qingshui (Xiamen) Environmental Technology Co., LTD, Xiamen 361022, China
* Corresponding author: fuhy@xmut.edu.cn
The effect of dissolved oxygen (DO) limitation strategies on the nitrogen removal performance of the SNAD system under high DO damage was explored. Nitrogen removal efficiency (NRE) decreased rapidly in a high DO environment (2.0-3.0 mg/L). The NRE temporarily recovered to 87.32% after the DO limiting strategy was adopted. However, the NRE decreased to 59.35% with the rapid increase in nitrate concentration and the average anaerobic ammonia oxidation rate decreased to 1.37 mg-TN/(gVSS-h). In order to suppress the gradually increasing nitrate concentration, DO was further limited to 0.3-1.0 mg/L. This strategy effectively stabilised the nitrate concentration and achieved the recovery of anammox bacteria (AnAOB) activity, but could not stably restore the system denitrification performance. At the same time, the pH in the system dropped below 7, which hindered the restoration of the nitrogen removal efficacy. The DO limitation strategy can temporarily restore AnAOB activity. Achieving stable nitrogen removal may require synergistic adjustments of alkalinity and hydraulic retention time, among other strategies.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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