In this study, methane (CH4) and nitrous oxide (N2O) emission dynamics of a plug–flow bioreactor located in a
municipal full-scale wastewater treatment plant were monitored during a period of 10 weeks. In general, CH4
and N2O gas emissions from the bioreactor accounted for 0.016% of the influent chemical oxygen demand
(COD) and 0.116% of the influent total Kjeldahl nitrogen (TKN) respectively. In order to identify the emission patterns
in the different zones, the bioreactor was divided in six different sampling sites and the gas collection hood
was placed for a period of 2–3 days in each of these sites. This sampling strategy also allowed the identification of
different process perturbations leading to CH4 or N2O peak emissions. CH4 emissions mainly occurred in the first
aerated site, and were mostly related with the influent and reject wastewater flows entering the bioreactor. On
the other hand, N2O emissionswere given along all the aerated parts of the bioreactor and were strongly dependant
on the occurrence of process disturbances such as periods of no aeration or nitrification instability. Dissolved
CH4 andN2O concentrations weremonitored in the bioreactor and in other parts of the plant, as a contribution for
the better understanding of the transport of these greenhouse gases across the different stages of the treatment
system.
In this study, methane (CH4) and nitrous oxide (N2O) emission dynamics of a plug–flow bioreactor located in amunicipal full-scale wastewater treatment plant were monitored during a period of 10 weeks. In general, CH4and N2O gas emissions from the bioreactor accounted for 0.016% of the influent chemical oxygen demand(COD) and 0.116% of the influent total Kjeldahl nitrogen (TKN) respectively. In order to identify the emission patternsin the different zones, the bioreactor was divided in six different sampling sites and the gas collection hoodwas placed for a period of 2–3 days in each of these sites. This sampling strategy also allowed the identification ofdifferent process perturbations leading to CH4 or N2O peak emissions. CH4 emissions mainly occurred in the firstaerated site, and were mostly related with the influent and reject wastewater flows entering the bioreactor. Onthe other hand, N2O emissionswere given along all the aerated parts of the bioreactor and were strongly dependanton the occurrence of process disturbances such as periods of no aeration or nitrification instability. DissolvedCH4 andN2O concentrations weremonitored in the bioreactor and in other parts of the plant, as a contribution forthe better understanding of the transport of these greenhouse gases across the different stages of the treatmentsystem.
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