| Project/Area Number |
16560478
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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 |
Civil and environmental engineering
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| Research Institution | Research Reactor Institute, Kyoto University |
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Principal Investigator |
FUJIKAWA Yoko Kyoto University, Research Reactor Institute, Associate Professor, 原子炉実験所, 助教授 (90178145)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAHARA Masataka Osaka Sangyo University, Faculty of Human Environment, Professor, 人間環境学部, 教授 (60026119)
HAMASAKI Tatsuhide Osaka Sangyo University, Faculty of Human Environment, Associate Professor, 人間環境学部, 助教授 (50340617)
FUKUI Masami Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (40027462)
MAHARA Yasunori Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (30371537)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | refractory organic matter / sequential fractionation / COD reduction / natural attenuation / molecular weight / C / N ratio / FT-IR |
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| Research Abstract |
We have developed a rapid infiltration (RI) system with hydraulic loading rate of a few m/day using granulated materials having high sorption capacity of dissolved organic matter (DOM). Dissolved organic matter (DOM) in water samples from the RI system located in Kusatsu and Hattabara, Japan, andslow rate system in Koga, Japan, was separated into six fractions based on polarity, molecular weight, and biodegradability in order to compare their abilities to remove DOM. 80-90% of the DOM in influents at the three facilities was refractory in 28-day biodegradability tests. Influents at the Koga (municipal wastewater after secondary treatment) and Kusatsu (river water) facilities were very similar in the relative abundances of the six fractions. The Hattabara influent (livestock farm effluent after primary treatment) contained more of the humic-low molecular weight (LMW)-refractory fraction and less of the humic-high molecular weight (HMW)-refractory fraction than the other facilities. Removal of the humic-HMW-refractory fraction generally was high (60%), whereas it was low for the humic and non-humic-LMW-refractory fractions (10-30%). Overall DOM removal efficiency probably was governed by the soil's sorption capacity, hydraulic loading rate, and amount of the LMW-refractory fraction in the influent. Size exclusion chromatography (SEC) analyses conducted on the Hattabara water showed that the DOM in the influent that absorbed 260nm UV constituted primarily of non-humic-HMW DOM fraction with molecular-weight of 100-15000 Dalton, and that the removal efficiency of HMW-DOM was constant over different molecular weight. FT-IR analyses also showed removal of specific compounds was not principal mechanisms of DOM removal in the Hattabara system. CHNS analyses showed that the HWM- DOM fractions in Hattabara were more abundant in nitrogen.
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