Proceedings

Linking nitrous oxide emissions and dissolved oxygen in full-scale biological wastewater treatment

Aboobakar, A.1,2, Cartmell, E.1, Stephenson, T.1, Jones, M.2, Vale, P.2, Dotro, G.1,2, 1Cranfield Water Science Institute, UK, 2Severn Trent Water, UK PRESENTATION ONLY

(free)

Abstract Nitrous oxide (N2O) is a greenhouse gas with a global warming potential 310 times stronger than CO2, and can be produced during biological wastewater treatment (WWT). Dissolved oxygen (DO) is believed to play a critical role, which can lead to incomplete nitrification or denitrification, triggering N2O production. This is significant in the current context of minimising energy use in activated sludge plants (ASPs) by lowering DO to reduce operational costs. Furthermore, better control of operating conditions may reduce N2O production and carbon emissions therein, and ultimately, increase process and energy efficiencies. A balance therefore, must be found, whereby carbon emissions are kept low, without compromising the efficiency in WWT. However, the link between DO and full-scale process emissions is only partially understood. This study aims to address this knowledge gap, by continuously monitoring N2O in full-scale, to establish the relationship with DO and operating conditions, as well as the impact to carbon footprint and process efficiency.

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