| 内容 |
論文 |
| 巻 |
9巻2号2004年
|
| Page |
67
|
| 題名 |
硝化細菌バイオセンサを用いた下水処理場への化学物質の流入回避について
|
| Title |
Biosensor-based Control of Nitrification Inhibitor in Municipal Wastewater Treatment Plants |
| 著者 |
○岡安祐司((独)土木研究所)，田中宏明(京都大学)，田中良春，乾 貴誌(（株）富士電機アドバンストテクノロジー) |
| Authors |
Y. Okayasu1，H. Tanaka2，Y. Tanaka3 and T. Inui3 |
| 著者表記 |
|
| 著者表記(英) |
|
| 著者勤務先名 |
|
| Office name |
|
| 著者所属名 |
|
| キーワード |
毒物センサー，硝化細菌，下水処理施設，水質事故，シアン |
| Key Words |
biosensor，nitrifying bacteria，wastewater treatment plant，chemical spill，cyanide |
| 概要 |
固定化した硝化細菌の呼吸活性をモニタリングすることにより、対象水中の毒性物質の存在を連続監視する毒物モニターを、下水処理場の流入下水の監視に適用した。さらに、この流入下水を用いて運転される２系列の模擬標準汚泥処理実験装置を準備し、一方を、毒物モニターが毒性物質を検出した場合には流入下水を回避池に導く制御を行う制御系、他方を何の制御も行わない対象系とした。この模擬活性汚泥処理実験装置において、人工的に、シアン化カリウムを添加することで水質事故を発生させ、毒物モニターでの検出と回避の制御の可否、下水処理水の水質悪化を抑える効果について評価を行った。 |
| Abstract |
Effect of potassium cyanide (KCN) on nitrification process in municipal wastewater treatment plants was studied by batch nitrification tests, which indicated that nitrification process tends to be inhibited at a lower KCN concentration than present discharge standard to sewerage. The experiment of the biosensor using nitrifying bacteria was also conducted for continuous monitoring of nitrification inhibitor in influent wastewater, and demonstrated that the biosensor can detect KCN at as low as EC10 of the above-mentioned batch nitrification test. Moreover, to know the effectiveness of application of the biosensor to avoid the impact of KCN due to accidental spill in sewerage system, KCN was intentionally injected into both the experimental models of activated sludge process equipped with and without the biosensor. The model with the biosensor that could detect KCN could divert the wastewater including KCN to a refuge tank, which resulted in the avoidance of upset of the activated sludge process. On the other hand, the model without the biosensor was upset in nitrification process due to KCN. Such difference demonstrates the effectiveness of the biosensor applied to countermeasures of accidental spill of toxic chemicals to avoid upset of nitrification in municipal wastewater treatment plants. |
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