title: The seasonal variation of emission of greenhouse gases from a full-scale sewage treatment plant.
abstract: 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.
authors.affiliation: Akita National College of Technology, Department of Civil and Environmental Engineering, Bunkyocho 1-1, Iijima, Akita, Japan. Electronic address: masuda@akita-nct.ac.jp.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Masuda
authors.affiliation: Tohoku University, Department of Civil and Environmental Engineering, Aoba 6-6-06, Aobayama, Aoba-ku, Sendai, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Tohoku University, Department of Civil and Environmental Engineering, Aoba 6-6-06, Aobayama, Aoba-ku, Sendai, Japan.
authors.forename: Itsumi
authors.initials: I
authors.lastname: Sano
authors.affiliation: Tohoku University, Department of Civil and Environmental Engineering, Aoba 6-6-06, Aobayama, Aoba-ku, Sendai, Japan. Electronic address: yyli@epl1.civil.tohoku.ac.jp.
authors.forename: Yu-You
authors.initials: YY
authors.lastname: Li
authors.affiliation: Tohoku University, Department of Civil and Environmental Engineering, Aoba 6-6-06, Aobayama, Aoba-ku, Sendai, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Nishimura
mesh_terms: D000397:Air Pollution / Q000706:statistics & numerical data*; D005740:Gases / Q000032:analysis; D017752:Greenhouse Effect; D017745:Incineration; D008697:Methane / Q000032:analysis; D009609:Nitrous Oxide / Q000032:analysis; D012621:Seasons; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry / Q000706:statistics & numerical data
chemical_list: D005740:Gases; D008697:Methane; D009609:Nitrous Oxide; D012722:Sewage; D062065:Wastewater
keywords: Greenhouse gas; LCA; Methane; Nitrous oxide; Sewage treatment plant