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[B-16.6 Technological measures for controlling CH₄ and N₂O from domestic wastewater treatment by using a bioengineering and ecoengineering system]

[Contact Person]

Inamori Yuhei
Head, International Water Environment Renovation Research Team
Regional Environment Division
National Institute for Environmental Studies
Environment Agency
Onogawa 16-2, Tsukuba, Ibaraki, 305-0053 Japan
Tel:+81-298-50-2400 Fax:+81-298-50-2560
E-mail:inamori@nies.go.jp

[Total Budget for FY1995-FY1997]

67,280,000 Yen (FY1997;22,779,000 Yen)

[Abstract]

The final goal of this project study is, to develop and establish the effective technology for controlling the greenhouse gases, CH₄ and N₂O, emitted through the wastewater and its treatment process. The DO controlled intermittent aeration activated sludge method with coagulant added can be used to prevent the discharge of N₂O at the same time as it effectively removes nitrogen and phosphorus to prevent eutrophication. It is also clear that they can respond to a certain degree of load fluctuation. The process is, therefore, considered to be an extremely effective way to prevent global warming and to improve water environments. The emission characteristics of CH₄ and N₂O varies in the difference in swine waste treatment system greatly. The accumulation of NO₂-N in nitrification process happens easily in swine waste treatment, and leads to increase N₂O emission. Therefore, to control emission of N₂O with proceeding with nitrogen removal, promotion of nitrification and denitrification is important by the combination of anoxic and aerobic treatment process under the proper condition. CH₄ emission from the wetland varied under different vegetation, and that showed daily, and seasonal change. Five strains of CH₄ oxidizing bacteria were isolated from the wetland sediment and soil

[Key Words]

Greenhouse Effect Gas Reduction, Methane (CH₄₂O),Bioengineering, Ecoengineering