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The refinement of the N2O emission factor originating from treated sewage water in rivers with different water
Hayato Kakishima1, Ayaka Kagamu2, Yoshitaka Ebie3
1Course of Architecture Civil and Environmental System Design, Toyo University, 2100, Kujirai, Kawagoe-shi, Saitama 350-8585, Japan.
Abstract:
Treated sewage water flowing into rivers contains nitrogen (N) compounds, producing nitrous oxide (N2O) through nitrification and denitrification reactions. In Japan, environmental reference values have been set for water quality for various locations within waterways, and these are classified into six different categories based on the level of water quality. This study aimed to refine the N2O emission factor originating from treated sewage water by conducting year-round research on the production of dissolved N2O in rivers with varying concentrations of organic matter, N, and dissolved oxygen. There were differences in the N2O emission factor derived from the nitrification reaction of ammonium (NH4)-N due to the impact of N pollution load caused by the inflow of treated sewage water into rivers with different water qualities. The calculated N2O emission factor for rivers with relatively high water quality concentrations was 0.0028 kgN2O-N kgNH4-N-1, and the calculated average N2O emission factor originating from treated sewage water in rivers was 0.0026 kgN2O-N kgNH4-N-1.
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