N2O emission from a sequencing batch reactor for biological N and P removal from wastewater

Lei SHEN, Yuntao GUAN, Guangxue WU, Xinmin ZHAN

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PDF(733 KB)
Front. Environ. Sci. Eng. ›› 2014, Vol. 8 ›› Issue (5) : 776-783. DOI: 10.1007/s11783-013-0586-0
RESEARCH ARTICLE

N2O emission from a sequencing batch reactor for biological N and P removal from wastewater

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Abstract

Nitrous oxide (N2O) is a greenhouse gas that can be released during biological nitrogen removal from wastewater. N2O emission from a sequencing batch reactor (SBR) for biological nitrogen and phosphorus removal from wastewater was investigated, and the aims were to examine which process, nitrification or denitrification, would contribute more to N2O emission and to study the effects of heterotrophic activities on N2O emission during nitrification. The results showed that N2O emission was mainly attributed to nitrification rather than to denitrification. N2O emission during denitrification mainly occurred with stored organic carbon as the electron donor. During nitrification, N2O emission was increased with increasing initial ammonium or nitrite concentrations. The ratio of N2O emission to the removed ammonium nitrogen (N2O-N/NH4-N) was 2.5% in the SBR system with high heterotrophic activities, while this ratio was in the range from 0.14% to 1.06% in batch nitrification experiments with limited heterotrophic activities.

Keywords

biological nutrient removal / denitrification / greenhouse gas / nitrification / nitrous oxide

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Lei SHEN, Yuntao GUAN, Guangxue WU, Xinmin ZHAN. N2O emission from a sequencing batch reactor for biological N and P removal from wastewater. Front.Environ.Sci.Eng., 2014, 8(5): 776‒783 https://doi.org/10.1007/s11783-013-0586-0

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant No. 51108242) and Shenzhen Science and Technology Development Funding-Fundamental Research Plan (No. JC201006030878A).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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