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[B-2.7 Study Amounts of Methane and Nitrous Oxide Release from Sewage Treatment Plant]

[Contact Person]

Kazuo Takeishi
Research Coordinator for Wastewater Treatment
Water Quality Control Department
Public Works Research Institute, Ministry of Construction
1 Asahi, Tsukuba, Ibaraki 305 Japan
Phone +81-298-64-3726, Fax +81-298-64-2817

[Total Budget for FY1990-1994]

21,448,000 Yen (FY1994 4,090,000 Yen)

[Abstract]

　A study of amounts methane and nitrous oxide release from wastewater treatment processes was performed. The amount released from a household nightsoil treatment tank(summer and fall) was studied and the result was combined with those obtained in winter to estimate the total amount released In Japan. The behavior of the release of N₂O from fluidized bed furnace which incinerates the sludge dewatered coagurating by the polymer was studied accompanying fluctuations in the operating conditions. The actual state of N₂O release from a sludge melting furnace was also studied, but in comparison with that of other incineration proccsses, its emission factor could be ignored. The results already obtained were summed up to estimate of the amounts CH₄ and N₂O released from sewage treatment plants both in Japan and throughout the world.

[Key Words]

CH₄, N₂O,Sewage treatment, Sewage sludge,Household nightsoil treatment tank