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http://dx.doi.org/10.12989/mwt.2017.8.2.171

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)
Publication Information
Membrane and Water Treatment / v.8, no.2, 2017 , pp. 171-184 More about this Journal
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
aerobic oxidation of methane with denitrification (AeOM-D); hydraulic retention time (HRT); methane ($CH_4$); carbon dioxide ($CO_2$); nitrous oxide ($N_2O$); greenhouse gases (GHGs);
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