Continuous Aeration Control to Reduce N₂O Emissions in a Full-Scale Sidestream Deammonification Reactor

Nitrous Oxide Emissions from Two Full-Scale Membrane-Aerated Biofilm Reactors

“…We are aware that this approach is a simplification, as N 2 O production and emissions are complex and affected by multiple variables, and different operational conditions and strategies can impact emissions (Vasilaki et al, 2018;Chen et al, 2020). Indeed, attempts to mitigate N 2 O emissions from PN/A reactors have resulted in EF N2O values lower than 1.6 % (Weissenbacher et al, 2010;Uri-Carreño et al, 2017). It also explains the variability in emissions within plants with similar specific N loading (left hand side of Fig.…”

Lessons Learned from 10 Years of ANITA Mox for Sidestream Treatment

“…Nitrous oxide (N 2 O) emissions from sidestream deammonification processes have been often linked to specific operation control strategies employed by the different technologies such as feeding regime (continuous vs. batch), aeration control (continuous vs. intermittent), and substrate concentration gradient in the reactor [15,16]. Ref.…”

“…Ref. [15] reported N 2 O emission from a full-scale granular sequencing batch reactor (SBR) deammonification unit at Ejby Mølle WWTP in Denmark in the range of 4-8% of incoming N-load under standard intermittent aeration control. The N 2 O emission was divided by half (2-4% of N-load) when the granular SBR was operated under a new continuous aeration strategy.…”

Gaseous Emissions from Wastewater Facilities

“…In another paper, He, Zhu, Li et al (2017) evaluated the N2O production in BAFs under varied dissolved oxygen (DO) concentrations and it was concluded that N2O emissions at a DO of 2 mg/L was more than 4 times higher compared to the emissions at a DO concentration of 6.0 mg/L. A surface emission flux chamber was employed to collect gas samples for CH4 and N2O analyses from two of the WWTPs in Xi'an, China (Li, Peng et al, 2017) (Uri et al, 2017).…”