Membrane and Water Treatment

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Greenhouse gases emission from aerobic methanotrophic denitrification (AeOM-D) in sequencing batch reactor

  • Lee, Kwanhyoung (Department of Environmental Engineering, Korea University) ;
  • Choi, Oh Kyung (Program of Environmental Technology and Policy, Korea University) ;
  • Lee, Jae Woo (Department of Environmental Engineering, Korea University)
  • Received : 2016.06.26
  • Accepted : 2016.10.12
  • Published : 2017.03.25
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Abstract

This study presents the effect of hydraulic retention time (HRT) on the characteristics of emission of three major greenhouse gases (GHGs) including $CH_4$, $CO_2$ and $N_2O$ during operation of a sequencing batch reactor for aerobic oxidation of methane with denitrification (AeOM-D SBR). Dissolved $N_2O$ concentration increased, leveled-off and slightly decreased as the HRT increased from 0.25 to 1d. Concentration of the dissolved $N_2O$ was higher at the shorter HRT, which was highly associated with the lowered C/N ratio. A longer HRT resulted in a higher C/N ratio with a sufficient carbon source produced by methanotrophs via methane oxidation, which provided a favorable condition for reducing $N_2O$ formation. With a less formation of the dissolved $N_2O$, $N_2O$ emission rate was lower at a longer HRT condition due to the lower C/N ratio. Opposite to the $N_2O$ emission, emission rates of $CH_4$ and $CO_2$ were higher at a longer HRT. Longer HRT resulted in the greater total GHGs emission as $CO_2$ equivalent which was doubled when the HRT increased from 0.5d to 1.0 d. Contribution of $CH_4$ onto the total GHGs emission was most dominant accounting for 98 - 99% compared to that of $N_2O$ (< 2%).

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea

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