| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Especially in developing countries, nitrate contamination of groundwater has become a serious issue affecting the quality of drinking water and health. For development of ecofriendly simple reactor to remove nitrate via hydrogenotrophic denitrification (HD), an intermittent hydrogen supply or a usage of hydrogen microbubble were tried to improve the hydrogen effectiveness and the reduction of treatment cost. Using a cycle with a short period of hydrogen supply or a hydrogen microbubble supply, the excellent nitrogen removal efficiency (96%) was achieved. Furthermore, Hydrogenophaga spp., which is well known as HD bacteria, was dominant under the continuous hydrogen supply system, whereas Thauera spp. were the most abundant species in the effective reactor with reduction of hydrogen supply amount. These results support strongly the existence of the hybrid bacterial denitrification activity in HD reactor and might be important information to develop a new HD treatment system.
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