| Project/Area Number |
09555167
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Tokyo University of Agriculture & Technology |
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Principal Investigator |
HOSOMI Masaaki Tokyo University of Agriculture & Technology, Faculty of Engineering, Professor, 工学部, 教授 (90132860)
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| Co-Investigator(Kenkyū-buntansha) |
AKIBA Michihiro Shimane University, Faculty of Life and Environment Science, Associate Professor, 生物資源科学部, 講師 (00159336)
YOU Muneoki Tokyo University of Agriculture & Technology, Faculty of Agriculture, Professor, 農学部, 助教授 (50260526)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Reed filter bed system / Vertical percolation / ィイD115ィエD1N stable isotope / Nitrogen removable / Denitrification / Domestic wastewater treatment / Advanced treatment / 生活排水 / ヨシ / 硝化 / アセチレン阻害法 / ^<15>N安定同位体 |
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| Research Abstract |
The objectives of this study are (i) to make clear the effectiveness of reed and the loading formula of wastewater (i.e., continuos loading (CL) or intermittent loading (IL)) on nitrogen removal efficiency in a reed filter bed system (RFB) and (ii) to measure denitrification rates using ィイD115ィエD1N tracer method. The obtained results are as follows:
1) It was found that the nitrogen removal rate in the RFB tank was higher than that in the sand tank (Control, i.e. without reeds) in both CL and IL. Although the nitrogen removal rate of the RFB with IL ranged from 47-97% (average 76%) during 19 months, that of RFB with CL exhibited seasonal variations with range of 4-95% (average 54%).
2) The ィイD115ィエD1N tracer methods showed that the denitrification rates of the RFB and the sand tank ranged form 0 to 5.5, 0 to 3.4 [g-N/mィイD12ィエD1 /day] respectively. These indicate that about 60% of nitrogen loading to the RFB tank and about 80% of nitrogen loading to the sand tank were removed by denitrification. A part of remaining nitrogen loss in nitrogen balance of the RFB tank was considered to be caused by plant uptake. High denitrification rate in the RFB suggested that microbial activity in the reed rhizosphere played a important role in nitrogen removal efficiency.
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