| Project/Area Number |
13555152
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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 | Kure National College of Technology |
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Principal Investigator |
YAMAGUCHI Takashi Kure National College of Technology, Dept. of Civil Engineering, Associate Professor, 環境都市工学科, 助教授 (10280447)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOZAKI Satoshi Kotobuki Engineering and Manufacturing Co., Ltd., Research and Development, Deputy Manager, 総合開発室, 次長
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥8,600,000 (Direct Cost: ¥8,600,000)
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| Keywords | Domestic wastewater / anaerobic digestion / methane fermentation / methane-oxidizing bacteria / sulfur-oxidizing bacteria / sulfate-reducing bacteria / low strength wastewater / nitrogen removal |
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| Research Abstract |
We have proposed sewage treatment system which consists of an UASB reactor as an anaerobic pre-treatment unit and an aerobic post-treatment unit. The aerobic unit is composed of a combination of a tricking filter reactor and a fluidized bed reactor in order to polish up the UASB effluent. The feasibility test feeding raw sewage for over 250 days was carried out with 7.18 m^3 pilot plant system at a municipal sewage treatment plant. Circulation of a part of the tricking filter effluent stream to the UASB as supplying a sulfate source improved the final effluent quality of the system. Influent unfiltered BOD of 303 mg/L decreased to 150 mg/L in UASB effluent and subsequently to 13 mg/L in the aerobic unit effluent for 12 hours in the HRT of whole system. Vial-activity batch tests suggested that the main electron flow for BOD oxidation in the UASB sludge shifted completely from methane production to sulfate reduction after 90 days operation.
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