10.1021/acs.est.5b02038.s001
Bing-Jie Ni
Bing-Jie
Ni
Yuting Pan
Yuting
Pan
Ben van den Akker
Ben
van den Akker
Liu Ye
Liu
Ye
Zhiguo Yuan
Zhiguo
Yuan
Full-Scale
Modeling Explaining Large Spatial Variations
of Nitrous Oxide Fluxes in a Step-Feed Plug-Flow Wastewater Treatment
Reactor
American Chemical Society
2015
N 2O emission data
Second Step
N 2O production pathways
biomass nitrogen loading rate
water quality parameters
nitrogen loading rate
Nitrous Oxide Fluxes
N 2O fluxes
N 2O emission monitoring data
WWTP
NH 2OH oxidation pathway
AOB denitrification pathway
N 2O production pathway
N 2O emission
N 2O model
wastewater treatment plants
2015-08-04 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Full_Scale_Modeling_Explaining_Large_Spatial_Variations_of_Nitrous_Oxide_Fluxes_in_a_Step_Feed_Plug_Flow_Wastewater_Treatment_Reactor/2144752
Nitrous
oxide (N<sub>2</sub>O) emission data collected from wastewater
treatment plants (WWTPs) show huge variations between plants and within
one plant (both spatially and temporarily). Such variations and the
relative contributions of various N<sub>2</sub>O production pathways
are not fully understood. This study applied a previously established
N<sub>2</sub>O model incorporating two currently known N<sub>2</sub>O production pathways by ammonia-oxidizing bacteria (AOB) (namely
the AOB denitrification and the hydroxylamine pathways) and the N<sub>2</sub>O production pathway by heterotrophic denitrifiers to describe
and provide insights into the large spatial variations of N<sub>2</sub>O fluxes in a step-feed full-scale activated sludge plant. The model
was calibrated and validated by comparing simulation results with
40 days of N<sub>2</sub>O emission monitoring data as well as other
water quality parameters from the plant. The model demonstrated that
the relatively high biomass specific nitrogen loading rate in the
Second Step of the reactor was responsible for the much higher N<sub>2</sub>O fluxes from this section. The results further revealed the
AOB denitrification pathway decreased and the NH<sub>2</sub>OH oxidation
pathway increased along the path of both Steps due to the increasing
dissolved oxygen concentration. The overall N<sub>2</sub>O emission
from this step-feed WWTP would be largely mitigated if 30% of the
returned sludge were returned to the Second Step to reduce its biomass
nitrogen loading rate.