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The seasonal variation of emission of greenhouse gases from a full-scale sewage treatment plant

Masuda, Shuhei, Suzuki, Shunsuke, Sano, Itsumi, Li, Yu-You, Nishimura, Osamu
Chemosphere 2015 v.140 pp. 167-173
aeration, carbon dioxide, electricity, greenhouse gas emissions, greenhouse gases, methane, nitrous oxide, seasonal variation, sewage, sewage treatment, sludge, wastewater, water temperature, water treatment
The seasonal variety of greenhouse gas (GHGs) emissions and the main emission source in a sewage treatment plant were investigated. The emission coefficient to treated wastewater was 291gCO2m−3. The main source of GHGs was CO2 from the consumption of electricity, nitrous oxide from the sludge incineration process, and methane from the water treatment process. They accounted for 43.4%, 41.7% and 8.3% of the total amount of GHGs emissions, respectively. The amount of methane was plotted as a function of water temperature ranging between 13.3 and 27.3°C. An aeration tank was the main source of methane emission from all the units. Almost all the methane was emitted from the aeration tank, which accounted for 86.4% of the total gaseous methane emission. However, 18.4% of the methane was produced in sewage lines, 15.4% in the primary sedimentation tank, and 60.0% in the aeration tank.