WWEM 2022

WWEM 2016 - IWA Papers

Paper Title: Integration of N2O emissions in the ASM2d model
Paper Topic: Modelling & Control (Wastewater Systems)
Presenter Name: Dr Juan Antonio Baeza Labat
Company/Organisation: Brunel University London

Paper Information :

Nitrous oxide (N2O), a greenhouse gas with significant contribution to the greenhouse effect, can be generated during the biological nutrient removal in wastewater treatment plants (WWTPs). Amongst the possible pathways for the N2O production, the autotrophic denitrification of nitrite and the incomplete hydroxylamine oxidation, both activated by Ammonia Oxidising Bacteria (AOB), are considered as the major N2O production mechanisms. In this work, a modified version of the IWA ASM2d model expanded to describe 2-step nitrification-denitrification was coupled with a 2-pathway model for N2O emissions by AOB for the prediction of N2O emissions from municipal wastewater treatment data. Although low dissolved oxygen (DO) conditions are recommended to reduce the energy requirements in WWTPs, our model predicts that low DO (<1.5 mgL-1) combined with a high influent ammonium concentration (>20.0 mgL-1) favours the partial nitrification and the subsequent N2O production via the autotrophic nitrite denitrification pathway.