7.2. Emission of greenhouse gas such as N2O and CH4
Ideally, nitrate was converted totally to N2 in a denitrification bioreactor.
In some cases incomplete denitrification resulted in the production of N2O.
The lower temperature, the carbon substrate with lower reaction rates and the presence of higher DO would lead to less complete nitrate removal, resulting in N2O emission in the outflow (Elgood et al., 2010). Anaerobic degradation of the organic carbon source resulted in the production of CO2 and possibly CH4.
It is likely that methanogenes could develop in the inner part of the biofilm attached on the solid substratewhen the microbial consumption of nitrate exceeded its diffusion into the biofilm. The fluxes of CH4 was low when nitrate remained sufficiently high to suppress methanogens, while the methanogenic bacteria enable to compete with denitrifiers for carbon
source once nitrate was depleted in the bioreactor (Schipper et al.,2010b).
7.2. Emission of greenhouse gas such as N2O and CH4Ideally, nitrate was converted totally to N2 in a denitrification bioreactor.In some cases incomplete denitrification resulted in the production of N2O. The lower temperature, the carbon substrate with lower reaction rates and the presence of higher DO would lead to less complete nitrate removal, resulting in N2O emission in the outflow (Elgood et al., 2010). Anaerobic degradation of the organic carbon source resulted in the production of CO2 and possibly CH4. It is likely that methanogenes could develop in the inner part of the biofilm attached on the solid substratewhen the microbial consumption of nitrate exceeded its diffusion into the biofilm. The fluxes of CH4 was low when nitrate remained sufficiently high to suppress methanogens, while the methanogenic bacteria enable to compete with denitrifiers for carbonsource once nitrate was depleted in the bioreactor (Schipper et al.,2010b).
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