| Project/Area Number |
21510089
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | Nihon University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
YOSHIDA Yukihito 日本大学, 理工学部, 教授 (40434120)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 環境負荷低減技術 / ポリリン酸蓄積細菌 / 亜酸化窒素 / 排水処理 / 好気脱窒 / 温室効果ガス / 亜硝酸 / 溶存酸素 / 地球温暖化 / 活性汚泥 / 包括酸素移動容量係数 |
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| Research Abstract |
Potentials of Nitrous Oxide(N_2O) production by Poly-Phosphate Accumulating Organisms(PAOs) were examined to reduce N_2O emission from wastewater treatment plants. Acetic acid, peptone and their mixture were used as organic substrates to cultivate the sludge enriched with different types of PAOs having different denitrification capability. Several findings were obtained as follows ; 1) Rhodocyclus-related PAO(R-PAO) can denitrify nitrite aerobically and produces N_2O as one of some final products. On the other hands, Actinobacteria-related PAO(A-PAO) does have little aerobic denitrification capability, hence, N_2O production is negligible. 2) Influencing factors on N_2O production by R-PAO are nitrite concentration, partial pressure of oxygen, and denitrification capability of R-PAO. The high nitrite concentration causes the higher aerobic denitrification rate of nitrite and the higher nitrite conversion to N_2O. The higher partial pressure of oxygen results in the higher nitrite conversion to N_2O and the lower aerobic denitrification rate of nitrite. Hence, the N_2O production rate depends on their balance. The higher denitrification capability of R-PAO results in the higher aerobic denitrification rate of nitrite and the lower nitrite conversion to N_2O. Hence, the N_2O production rate also depends on their balance.
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