報告書番号

V09033

タイトル（和文）

窒素除去バイオリアクターの石炭火力発電所実排水への適用性の検証

タイトル（英文）

Application of nitrogen-removal bioreactor to wastewater treatment in coal-fired power plant

概要 （図表や脚注は「報告書全文」に掲載しております）

石炭火力発電所が有する窒素排水の処理に適用可能な窒素除去バイオリアクターを開発するため、リアクターの主要部品である浄化モジュールとアルコール供給装置の検討を行うとともに、硝酸態窒素を含む実排水を用いた連続処理試験により、それらの耐久性を検証した。その結果、開発した浄化モジュールは、1年間にわたる耐久性を有しており、排水と良好な接触を維持できる環境下において、ラボ実験と同等以上の窒素除去速度（表面積1 m2当たり7 g-N/day）を示した。また、アルコール供給装置についても、反応槽内に設置した多数の浄化モジュールに対し、均一かつ安定してアルコールを供給でき、1年間を通して浄化モジュール内のアルコール濃度を一定に維持することにより、安定した窒素除去速度を示すことができた。

概要 （英文）

An experimental facility (2 m3 of a reactor tank volume) was installed in a coal-fired power plant to examine the ability and durability of a module capable of nitrogen removal and a device for alcohol supply. The module capable of nitrogen removal is the main part of the facility. The module in the single reactor tank can remove nitrogen from wastewater. The inexpensive and manufacturable module was developed in this study,and was used for a continuous operation in the power plant. To treat nitrate-containing wastewater, the modules in the reactor tank had been operated for a year. When the modules were sufficiently in contact with wastewater in the reactor tank, they showed 7 g-N day-1 of the nitrogen removal rate per 1 m2 of the module surface. The rate was equal or more than that in the laboratory experiments. The continuous operation didn't damage the modules. These results show that the developed module has high performance of nitrogen-removal and durability. The device for alcohol supply is also an important part of the facility, since the module in the reactor tank requires alcohol as an electron donor for denitrification. Although a large number of the modules are installed in the reactor tank, the device has to distribute alcohol to all modules equally. This effective device for alcohol supply was developed in this study, and was used in the continuous operation of the power plant. The device was able to keep the alcohol concentration of all modules constant for a year. The modules performed high performance of nitrogen-removal. The developed module and the device for alcohol supply are certainly useful in the application of this facility for nitrogen removal.

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