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Xiang-kun Li, Ying-jun Yang, Gai-ge Liu, Dou-dou Sun, Xiao-chen Ma. 2023: Enhanced nitrogen removal at low temperature with mixed anoxic/oxic process. Water Science and Engineering, 16(1): 67-75. doi: 10.1016/j.wse.2022.08.005
Citation: Xiang-kun Li, Ying-jun Yang, Gai-ge Liu, Dou-dou Sun, Xiao-chen Ma. 2023: Enhanced nitrogen removal at low temperature with mixed anoxic/oxic process. Water Science and Engineering, 16(1): 67-75. doi: 10.1016/j.wse.2022.08.005
shu

Enhanced nitrogen removal at low temperature with mixed anoxic/oxic process

doi: 10.1016/j.wse.2022.08.005

  • a School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;

  • b School of Environment, Harbin Institute of Technology, Harbin 150090, China

Funds:

This work was supported by the National Natural Science Foundation of China (Grants No. 51978233 and 52000057) and the China Postdoctoral Science Foundation (Grant No. 2020M680844).

  • Received Date: 2021-12-20
  • Accepted Date: 2022-09-06
  • Rev Recd Date: 2022-08-24
    Abstract
  • Different hydraulic retention times (HRTs) were tested in a mixed anoxic/oxic (A/O) system at 5 C and 10 C to investigate the effects of HRT and carrier on nitrogen removal in wastewater at low temperatures. The results showed that the addition of the fillers improved the treatment effect of each index in the system. With an optimal HRT of 7.5 h at 5 C, the removal efficiencies of NH4+-N and total nitrogen (TN) reached 91.2% and 75.6%, respectively. With an HRT of 6 h at 10 C, the removal efficiencies of NH4+-N and TN were 96.7% and 82.9%, respectively. The results of high-throughput sequencing showed that the addition of the suspended carriers in the aerobic zone could improve the treatment efficiency of nitrogen at low temperatures. The microbial analysis indicated that the addition of the suspended carriers enhanced the enrichment of nitrogen removal bacteria. Nitrospira, Nitrotoga, and Nitrosomonas were found to be the bacteria responsible for nitrification, and their relative concentrations on the biofilm at 5 C and 10 C accounted for 98.11%, 92.79%, and 69.98% of all biological samples, respectively.

     

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