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[Ｂ−１６.５　Evaluation of Technologies to Reduce the Emission of Green-House Effect Gases in Wastewater Treatment System]


[Contact person]

      Kenji Sakai
      Research Coordinator for Wastewater Treatment
      Water Quality Control Department,
      Public Works Research Institute, Japan
      Ministry of Construction
      1, Asahi, Tsukuba-shi, Ibaraki-ken, 305-0804 Japan
      Tel: +81-298-64-3726 Fax: +81-298-64-2817
      E-mail: k-sakai@pwri.go.jp


[Total Budget for FY1998-1999]

　15,818,000 Yen
　(FY 1999; 7,340,000 Yen)

［Abstract］

　The aim of this research is to evaluate the technologies to reduce the emission of the green-house effect gases(GHG), such as methane(CH4) and nitrous oxide(N2O), from the wastewater treatment facilities.
　The emission of CH4, and N2O from conventional activated sludge process was compared with that of AO and A2O process. The introduction of anaerobic tank was effective to reduce the emission of CH4. The PO4-P concentration in the anaerobic tank had little relation to the emission of CH4.
　The raise of furnace temperature in fluidized bed incinerators of sewage sludge was evaluated from the aspects of the effect and the cost. Half of the N2O emission from sludge incinerators can be reduced with this countermeasure. The cost of the reduction of GHG was estimated around 10,000 yen/t-C.


［Key Words］

　Green-House Effect Gases, Methane, Nitrous Oxide, Wastewater Treatment, Sludge Incineration