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A review of partial nitrification in biological nitrogen removal processes: from development to application

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Abstract

To further reduce the energy consumption in the wastewater biological nitrogen removal process, partial nitrification and its integrated processes have attracted increasing attentions owing to their economy and efficiency. Shortening the steps of ammonia oxidation to nitrate saves a large amount of aeration, and the accumulated nitrite could be reduced by denitritation or anammox, which requires less electron donors compared with denitrification. Therefore, the strategies through mainstream suppression and sidestream inhibition for the achievement of partial nitrification in recent years are reviewed. Specifically, the enrichment strategies of functional microorganisms are obtained on the basis of their growth and metabolic characteristics under different selective pressures. Furthermore, the promising developments, current application bottlenecks and possible future trends of some biological nitrogen removal processes integrating partial nitrification are discussed. The obtained knowledge would provide a new idea for the fast realization of economic, efficient and long-term stable partial nitrification and biological nitrogen removal process.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (51808223), Fundamental Research Funds for the Central Universities (JKB012014053, 50321022017009), National Key Research and Development Program of China (2019YFC0408202), Shanghai Educational Development Foundation (18CG34), and Shanghai Rising-Star Program (20QC1400500).

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Correspondence to Wei Li.

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Wang, J., Li, L., Liu, Y. et al. A review of partial nitrification in biological nitrogen removal processes: from development to application. Biodegradation 32, 229–249 (2021). https://doi.org/10.1007/s10532-021-09938-x

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  • DOI: https://doi.org/10.1007/s10532-021-09938-x

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