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Title: | Nitrous oxide emissions during wastewater treatment process | Authors: | Nguyen Phuong Dung | Keywords: | Nitrous oxide emissions;Wastewater treatment process | Issue Date: | 2022 | Abstract: | Nitrous oxide (N2O) is considered as one of the greenhouse gases emitted from municipal wastewater treatment plants and causes global warming effects. In this thesis, the overview of N2O emissions during biological treatment processes shall be introduced according to previous literature reviews, and methodologies to reduce N2O production would be proposed. In general, N2O is generated from biological treatment processes through three main pathways: NH2OH oxidation, nitrifier denitrification, and heterotrophic denitrification with the catalyst of ammonia-oxidizing bacteria, nitrate oxidizing bacteria, and denitrifying bacteria. Boundary conditions such as initial ammonium, dissolve oxygen, nitrite concentration, carbon sources, transient anoxic-aerobic conditions, temperature, pH, and phosphorus concentrations affect the amount of N2O emitted during wastewater treatment. Although the attached growth system, nitritation denitritation, and aerobic granular processes show their advantages in saving space and energy, N2O production from these processes is still higher than that of the conventional activated sludge process. Various methods to estimate, measure, and calculate N2O emissions have been illustrated, from using capita protein to directly measured by sensors to calculate N2O generated. Finally, based on the knowledge of emission pathways, operation parameters, and calculation models have been discovered, approaches to prevent and reduce N2O production in wastewater treatment plants would be introduced, such as dissolved oxygen and aeration control, carbon source addition, pH, temperature control and magnetic field creation, optimizing living conditions for denitrifying bacteria, inlet and initial ammonium concentration control, and long-term monitoring. |
URI(1): | https://epub.vgu.edu.vn/handle/dlibvgu/1708 |
Appears in Collections: | Water Technology, Reuse and Management (WTE) Water Technology, Reuse and Management (WTE) |
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Nitrous oxide emissions during wastewater treatment process.pdf | 2.15 MB | Adobe PDF | View/Open |
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