Volume 17 Issue 3
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Qiong-qiong Xia, Wei Shang, Xing-can Zheng, Wen-an Zhang, Ya-xiong Wang, Yong-li Sun, Peng-feng Li. 2024: Effect of aeration on low-substrate CANON process. Water Science and Engineering, 17(3): 292-299. doi: 10.1016/j.wse.2023.11.005
Citation: Qiong-qiong Xia, Wei Shang, Xing-can Zheng, Wen-an Zhang, Ya-xiong Wang, Yong-li Sun, Peng-feng Li. 2024: Effect of aeration on low-substrate CANON process. Water Science and Engineering, 17(3): 292-299. doi: 10.1016/j.wse.2023.11.005
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Effect of aeration on low-substrate CANON process

doi: 10.1016/j.wse.2023.11.005

  • North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300074, China

Funds:

This work was supported by the China National Science and Technology Major Project for Water Pollution Control and Treatment (Grant No. 2017ZX07106005).

  • Received Date: 2022-07-20
  • Accepted Date: 2023-10-24
    • Available Online: 2024-08-24
    Abstract
  • The completely autotrophic nitrogen removal over nitrite (CANON) is a new type of nitrogen removal process developed in recent years. The control of dissolved oxygen (DO) in this process is relatively stringent, especially in low-substrate wastewater treatment. However, the results of studies on the operation of the process in different aeration modes are still controversial, and investigations on biofilm type CANON reactors are limited. In this study, a pilot-scale CANON bioreactor filled with suspended carriers was investigated on the treatment of wastewater at low ammonium concentrations, and the effect of the aeration mode on autotrophic nitrogen removal was evaluated. Seven conditions with various aeration on/off times and DO levels were tested. The results showed that an intermittent aeration with a 20-min/20-min aeration on/off time and DO concentrations of 1.0–1.3 mg/L at the end of the aeration period was appropriate, potentially inhibiting nitrite oxidizing bacteria (NOB) and keeping the total nitrogen (TN) removal rate at a relatively high level of 76.7% ± 2.5%. In the optimal aeration mode, the reactor achieved effluent TN and concentrations of (11.1 ± 3.3) mg/L and (3.6 ± 2.3) mg/L, respectively, with a hydraulic retention time of 12 h and an influent concentration of (48.6 ± 9.4) mg/L at 30.1°C ± 2.2°C. The results of metagenomic sequencing for microorganisms on carriers indicated that the main nitrogen removal bacteria in the reactor were Proteobacteria, Planctomycetes, and Nitrospirae. The NOB genus Nitrospira was completely inhibited by intermittent aeration. Candidatus Kuenenia had strong adaptability to low-concentration wastewater.

     

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