Assessment of Full-Scale N₂O Emission Characteristics and Testing of Control Concepts in an Activated Sludge Wastewater Treatment Plant with Alternating Aerobic and Anoxic Phases

Abstract

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Integrated Model for Understanding N2O Emissions from Wastewater Treatment Plants: A Deep Learning Approach

“…In other words, the joint interaction effects between temperature, NO 3 – –N, NH 4 –N, and influent flow rate are implied to drive the variability in N 2 O dynamics in the studied plant, which is operated as alternating between aerobic and anoxic periods. This is, in fact, in agreement with our previous work, which has revealed the importance of elevated NO 3 – –N concentration at the end of aerobic cycles combined with insufficient carbon source where the following anoxic phase leads to incomplete denitrification of N 2 O concentration in the liquid phase during the anoxic phase. As N 2 O is not completely denitrified during the anoxic phase, it is then stripped in the next aerobic phase, thereby contributing to the N 2 O emissions from the plant.…”

“…Overall, both Sobol and Kucherenko methods successfully complement each other and confirm the importance of the key process parameters that affect the N2O dynamics in the plant. While these findings are known from process engineering knowledge and operational experience 12,21 , the advantage of GSA is that it provides a quantification of the relationship. The latter is important when deciding on potential control strategies for the plant.…”

“…The latter is important when deciding on potential control strategies for the plant. In the case of the Avedøre plant, we have successfully tested the effect of DO setpoint in our previous study 21 ;…”

Temperature and oxygen level determine N2O respiration activities of heterotrophic N2O‐reducing bacteria: Biokinetic study

“…The four tested N 2 ORB from the two different nos Z types have distinct biokinetic traits at different temperatures (Figure 1), indicating that temperature is one of the potential factors governing the abundance and composition of the N 2 ORB communities. Seasonal temperature variations are often observed in WWTPs, where N 2 O emissions are correspondingly changed (Chen et al, 2019). Similarly, the temperature dependence of bioreactor performances is also reported (Watanabe et al, 2017), with lower observed N 2 O consumption activity at a low temperature (Wang et al, 2018).…”

Gaseous emissions from wastewater facilities

“…Data from a long‐term monitoring campaign were used to quantify full‐scale N 2 O emission of an WRRF operating an activated sludge system with aerobic and anoxic phases (Chen et al., 2019). A relatively low N 2 O emission was reported during seasons with decreasing water temperature trends.…”