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[B-16.9.1 Development of Appropriate Wastewater and Sludge Treatment Technology for Controlling CH₄ and N₂O emission applicable to China]

[Contact Person]

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

[Total Budget for FY1995-FY1997]

9,810,000 Yen (FY1997;3,271,000 Yen)

[Abstract]

Alcaligenes faecalis, a typical heterotrophic nitrifying and denitrifying bacterium, was added into activated sludge and was made to be a dominant genus of the activated sludge ecosystem. lnfluent COD to total nitrogen (TN) ratios and quantities of the inoculated A. faecalis were changed to test the responses of the systems. Behaviors of the systems to N₂O generation and wastewater treatment were evaluated. Experimental results showed that: N₂O production of the systems containing A. faecalis was generally about 50% of those of the control reactors containing only activated sludge. In addition, the former systems had a higher total nitrogen removal capability, their average total nitrogen removal efficiencies were generally over 30% higher than those of the control activated sludge systems. Moreover, COD removal efficiencies of the systems containing A. faecalis were higher than those of the control systems. On the other hand, more alien A. faecalis addition and higher influent COD to TN ratio led to lower N₂O emission and better effluent water qualities. Therefore, increasing the quantity of A. faecalis in activated sludge should be encouraged for controlling N₂O emission and upgrading wastewater treatment capability.

[Key Words]

Alcaligenes faecalis, global warming, N₂O emission, nitrogen removal