| 内容 |
論文 |
| 巻 |
19巻2/3号2014年
|
| Page |
106
|
| 題名 |
送風量制御による下水処理における一酸化二窒素の排出削減方法
|
| Title |
Reduction method of Nitrous Oxide (N2O) Emission from Activated Sludge Process with Aeration Control |
| 著者 |
草野 吏 1)，小沼 晋 2)，鈴木重浩 1)，齋藤利晃 2)，濱本亜希 3)，小林政行 3) |
| Authors |
Tsukasa KUSANO 1), Susumu KONUMA 2), Shigehiro SUZUKI 1), Toshiaki SAITO 2), Aki HAMAMOTO 3) and Masayuki KOBAYASHI 3) |
| 著者表記 |
1)メタウォーター(株), 2)日本大学理工学部, 3)東京都下水道局計画調整部技術開発課 |
| 著者表記(英) |
1) Business Strategy Division Technology Strategy Dept., METAWATER Co., Ltd., 2) College of Science and Technology, NIHON University, 3) Technical Development Section Planning and Coordination Division, Bureau of Sewerage Tokyo Metropolitan Government |
| 著者勤務先名 |
|
| Office name |
|
| 著者所属名 |
|
| キーワード |
一酸化二窒素，硝化，酸化還元電位，活性汚泥処理，送風量制御 |
| Key Words |
nitrous oxide, nitrification, oxidation-reduction potential, activated sludge process, aeration control |
| 概要 |
下水処理プロセスからの地球温暖化ガス削減の運転管理の最適化を目的に，活性汚泥装置にて一酸化二窒素(N2O)の排出削減方法を調査した。調査結果から，N2O排出削減型の送風量制御方法として，槽前段部で硝化を抑制し，槽後段部において硝化を促進する方法(後段硝化型)が，対照系のDO制御に比較し約45%削減した。また，反応槽の硝化速度を変化させて活性汚泥中の硝化細菌によるN2O生成量を計算するモデルを開発し，実験結果との整合性を確認し，後段硝化型の送風量制御がN2O生成を抑制すると結論づけた。本稿では，その排出削減方法及び評価について報告する。 |
| Abstract |
In order to reveal the optimum aeration control strategy of the conventional activated sludge process for substantial reduction of nitrous oxide (N2O) emission, we operated two identical bench-scale reactors with six consecutive aeration tanks, focusing on the progress of nitrification. From the experimental results, we have found that low N2O emission was observed when nitrification occurred more at the latter part of the aeration tanks than the former part. This control method focusing on the progress of nitrification attained 45% reduction of N2O emission as compared to DO control method. To confirm the experimental results, the mathematical model with N2O production by two groups of ammonia oxidizing bacteria was developed. The simulation results agreed with tendency of the experimental results. Hence we concluded that the aeration control to provide more nitrification at the latter part of aeration tanks is preferable for the reduction of N2O emission. |
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