Research Article

Frontiers of Environmental Science & Engineering

, Volume 8, Issue 5, pp 776-783

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

  • Lei ShenAffiliated withKey Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University
  • , Yuntao GuanAffiliated withKey Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University
  • , Guangxue WuAffiliated withKey Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen, Tsinghua University Email author 
  • , Xinmin ZhanAffiliated withCivil Engineering, College of Engineering and Informatics, National University of Ireland

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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 (N2ON/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