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[Ｂ−１６.６.３　Development of Appropriate Wastewater and Sludge Treatment Technology for Controlling CH4 and N2O Emission Applicable to China (Final Report)]


[Contact person]

      Yuhei Inamori
      Head, International Water Environment Renovation Research Team
      Regional Environment Division
      National Institute for Environmental Studies
      16-2 Onogawa, Tsukuba, Ibaraki 305-0053 Japan
      Tel: 81-298-50-2400, Fax: 81-298-50-2570
      Email: inamori@nies.go.jp


[Total Budget for FY1998-1999]

　5,008,000 Yen
　(FY 1999: 2,407,000 Yen)

［Abstract］

　With the aim to improve nitrogen removal and to control the emissions of green-house gases as well, some comparative investigations were made between the processes of SND (simultaneous nitrification and denitrification) and SQND (sequential nitrification and denitrification) for treating domestic wastewater.
The results showed that both SND and SQND had good nitrogen removal abilities, with TN removal 41.42% for SND and 45.65% for SQND, and the later one is a little higher than former one by 4.23%, but SND obtained a less lower N2O emission than SQND; that DO concentration played important role in aerobic phase of SND for TN removal, and it indicated the tendency that TN removal efficiency went higher as DO became lower.
It seems that intermittently aerated SBR system, a kind of modified SQND process, is a hopeful wastewater treatment process for nitrogen removal, for that it obtained a TN removal efficiency of 81.8%, much higher than those obtained from SND and SQND.


［Key Words］

　Simultaneous nitrification and denitrification, Nitrogen removal, Green-house gases, N2O emission