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| ホーム > 学会誌「EICA」 > 論文検索 > |
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| 内容 |
研究発表 |
| 巻 |
9巻2号2004年
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| Page |
75
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| 題名 |
ORP control for nitrogen removal from sewage with low C/N ratio in a hybrid biofilm pilot plant
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| Title |
ORP control for nitrogen removal from sewage with low C/N ratio in a hybrid biofilm pilot plant |
| 著者 |
Y. O. Kim*，H. U. Nam*，I. G. Byun**，T. J. Park** and T. H. Lee* |
| Authors |
Y. O. Kim*，H. U. Nam*，I. G. Byun**，T. J. Park** and T. H. Lee* |
| 著者表記 |
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| 著者表記(英) |
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| 著者勤務先名 |
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| Office name |
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| 著者所属名 |
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| キーワード |
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| Key Words |
Denitrification; external carbon source; low C/N ratio; nitrogen removal; ORP control |
| 概要 |
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| Abstract |
An oxidation reduction potential (ORP) control system, which adjusted amount of external carbon source for denitrification based on ORP values, was applied to a hybrid biofilm pilot plant for cost-effective removal of nitrogen from sewage with low C/N ratio. The pilot plant consisted of serially anoxic-, aerobic-, anoxic-, aerobic-reactor and both aerobic reactors were separated two parts with a baffle. Influent BOD and total nitrogen (T-N) concentrations were varied in the rage of 25.0-140.5 mg/L and 15.5-46.5 mg/L, respectively. Because the C/N ratio (1.6-3.0) of the influent was too low to complete denitrification, an external carbon source of methanol was added to the second anoxic reactor to meet the regulation limit of effluent T-N, 10.0 mg/L. The effluent T-N concentration was directly affected by methanol addition in the tested concentration range, 50 to 100 mg/L as final concentration in the second anoxic reactor. An empirical equation decided from the ORP values according to added methanol amount was ORP = 0.0055[methanol]2 - 2.2733[methanol] + 37.402. The concentration of methanol addition was decided from an empirical equation according to the ORP value measured in the second anoxic reactor. As a result of applying the ORP automatic control system, 20% of the amount of methanol addition was reduced comparing with the fixed amount addition of methanol as final concentration as 75 mg/L without ORP control system. These results suggested that ORP auto-control system would be applied to efficient and cost effective removal of nitrogen from sewage with low C/N ratio. |
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