4.7 Article

The nitrification recovery capacity is the key to enhancing nitrogen removal in the AOA system at low temperatures

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 818, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2021.151674

Keywords

Low temperature; Recovery of nitrification; Endogenous denitrification; Advanced nitrogen removal; Adjustment strategy

Funding

  1. Foundation for Innovative Research Groups of the National Natural Science Foundation of China [62021003]
  2. Biological Wastewater Treatment and Process ControlTechnology, Beijing International Science and technology Cooperation Base and Funding Projects of Beijing Municipal Commission of Education

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This study investigated the nitrogen removal performance of AOA process at low and room temperatures. The results showed that the nitrification capacity of AOA process was recovered at low temperature and the endogenous denitrification performance was enhanced by converting the partial aerobic zone into anoxic. The activity and abundance of ammonia-oxidizing bacteria (AOB) increased at low temperature, which was the key for nitrification capacity recovery. Overall, AOA system showed the possibility of advanced nitrogen removal at low temperatures.
Anaerobic/aerobic/anoxic (AOA) is suitable for advanced nitrogen removal of low C/N wastewater as an energy-saving process. Investigations of the temperature impact on the AOA process are critical to its application in cold regions or seasons. In this study, the nitrogen removal performance in AOA at low and room temperatures was investigated. The nitrification capacity of the AOA process was recovered at low temperature and the endogenous denitrification performance was enhanced by converting the partial aerobic zone into anoxic. At 15 degrees C, treating real municipal sewage with a low C/N ratio (3.36), TIN and NH4+-N removal efficiencies of 84.3 +/- 6.6% and 97.4 +/- 3.3% respectively, were achieved. The oxygen uptake rate test, quantitative PCR, and high-throughput sequencing results indicated that the activity and abundance of ammonia-oxidizing bacteria (AOB) increased at low temperature, which was the key for nitrification capacity recovery. Overall, the recoverability of nitrification capacity in the AOA system made advanced nitrogen removal possible at low temperatures. (c) 2021 Elsevier B.V. All rights reserved.

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