| Project/Area Number |
07555172
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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 | 試験 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | NAGAOKA UNIVERSITY OF TECHNOLOGY |
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Principal Investigator |
OHASHI Akiyoshi NAGAOKA UNIVERSITY OF TECHNOLOGY,Associate PROFESSOR, 工学部, 助教授 (70169035)
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| Co-Investigator(Kenkyū-buntansha) |
HISANO Tomoaki IHI CO.LTD., RESEARCHER, 技術研究所, 研究員(研究職)
FYKUNAGA Sakae IHI CO.LTD., RESEARCHER, 技術研究所, 専門課長(研究職)
ARAKI Nobuo NAGAOKA NATIONAL COLLEGE OF TECHNOLOGY,Associate PROFESSOR, 都市環境工学科, 助教授 (30193072)
MOMONOI Kiyoshi NAGAOKA UNIVERSITY OF TECHNOLOGY,PROFESSOR, 工学部, 教授 (60003852)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1996: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Thermophilic anaerobic treatment / UASB process / granulation / Alcohol distilllery wasrewater / Methanogenic activity / supper wastewater treatment |
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| Research Abstract |
All practical-scale UASB processes constructed so far have adopted either mesophilic or ambient temperature conditions. There is at present no thermophilic UASB process in operation, except one demonstration-scale process. One of the main causes hindering the dissemination of thermophilic UASB process may be the difficulty or less reliability of granule formation, compared with mesophilic processes.
In order to investigate the performance of new developed thermophilic UASB reactor and the behavior of methanogenic activities of the retained sludge, the laboratory-scale UASB reactor was operated approximately 2 years by feeding with an alcohol distilllery wast under thermophilic conditions (55ﾟC). The reactor was inoculated with mesophilically-grows granulated sludge harvested from an UASB reactor receiving a carbohydrate (mainly juice) waste water.
The novel thermophilic UASB reactor having a multistage of gas solid separator resulted in a low SVI and good stability of retained granulated sludge. As a result of establishment of well-settleable, high-activity granuled sludge, the reactor allowed ultimately a volumetric organic loading of 100kgCOD/m3/day, with a COD removal efficiency of around 85-90%. Methanogenic activities of the retained sludge reached finally up to 2.9g COD/g VSS/d for acetate, 0.69g COD/g VSS/d for propionate, and 16.2g COD/g VSS/d for hydrogen. Low values of the propionate-fed methanogenic activity compared to other thermotrophic groups, indicate that the propinate breakdown is mostly subject to be a rate-limiting step in thermophilic methane fermentation process.
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