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[B-16.9.3 Development of CH₄ and N₂O Emission Control Using Ecoengineering Systems Such as Wetlands, Soil Trenches and Oxidation Ponds (Final Report)]

[Contact Person]

Yuhei Inamori
Head, International Water Environment Renovation Research Team
Regional Environmental Division,
National Institute for Environmental Studies.
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]

4,000,000 Yen (FY1997;2,000,000 Yen)

[Abstract]

This international joint research project has been undertaken to develop counter-measure technology using an ecoengineering system that can control the generation of CH₄, N₂O and other gasses in soil trenches used to treat domestic wastewater. During 1996, CH₄ and N₂O gas generation characteristics were analyzed based on a field survey of the generation of CH₄ and N₂O gas in soil trench treatment facilities in Japan and China and on the clarification of the mass balance by laboratory bench scale soil trenches. In 1997 the mechanisms of the generation of CH₄ and N₂O gas were clarified based on an analysis of the mass balance by the same bench scale soil trenches constructed at national testing bodies in both countries, the relationship between the generation of CH₄ and N₂O gasses and ORP was analyzed, and research was performed to develop a circulating anaerobic bed soil trench system that controls the generation of CH₄ and N₂O by incorporating the micro ventilation method.

The results of this research have revealed that the principal mechanisms behind the high discharge of CH₄ and N₂O by soil trenches are structural factors, that it is possible to control the generation of N₂O by keeping the ORP above +150 mV or below -10 mV, that it is possible to keep the ORP between +300 and +400 mV by applying the micro ventilation method, and that this can reduce the discharge of CH₄ and N₂O to about 1/2 and 1/3 respectively.

[Key Words]

CH₄, N₂O, ORP, Soil Trench, China