| 研究課題/領域番号 |
14F04372
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 外国 |
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| 研究分野 |
土木環境システム
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| 研究機関 | 北海道大学 |
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研究代表者 |
船水 尚行 北海道大学, 工学研究院, 教授 (10113622)
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| 研究分担者 |
GUIZANI MOKHTAR 北海道大学, 工学研究院, 外国人特別研究員
GUIZANI Mokhtar 北海道大学, 工学(系)研究科(研究院), 外国人特別研究員
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| 研究期間 (年度) |
2014-04-25 – 2017-03-31
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| 研究課題ステータス |
完了 (2016年度)
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| 配分額 *注記 |
2,200千円 (直接経費: 2,200千円)
2016年度: 800千円 (直接経費: 800千円)
2015年度: 1,100千円 (直接経費: 1,100千円)
2014年度: 300千円 (直接経費: 300千円)
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| キーワード | エンドトキシン / 土壌処理 / 凝集処理 / 正荷電膜 / 排水再利用 / 毒性物質 / LPS / 処理 / 下水処理 / 国際研究者交流 |
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| 研究実績の概要 |
LPS endotoxins are bacterial by-products that present a possible threat to humans if ingested. Investigation explored different removal methods to remove the LPS endotoxin from the reclaimed wastewater:1)Long term Soil aquifer treatment; 2)Coagulation and flocculation; 3)filtration through positively charged micro structure membranes.
1)Long term operation of soil aquifer treatment of endotoxin proved that the efficiency decreases over time. After one year of operation, bacterial growth in the soilleads to LPS endotoxin production in the soil lowering its removal efficiency. In addition, longer operation leads to a degradation of the soil adsorption capacity.
2)Coagulation and flocculation process provided satisfactory results in reducing LPS endotoxins in water as a first barrier. The highest endotoxin removal was achieved at an aluminum sulfate dose of 80 mg/L at a pH of 4.69. However the optimum pH for DOC and turbidity removal is 6.35.The residual LPS endotoxin concentration was significantly higher than the reported value in tap and groundwater. This suggests a need for further treatments for safe potable reuse.
3)With respect to positively charged micro structure membranes, the study confirmed the assumption that positively charged membranes are an effective alternative for LPS endotoxin removal from reclaimed wastewater. Indeed, comparable or even better removal efficiency of LPS endotoxin Removal using positively charged membranes than the microfiltration was observed, even though it has a larger pore size.
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| 現在までの達成度 (段落) |
28年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
28年度が最終年度であるため、記入しない。
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