著者

鈴木 穣 宮原 茂 竹石 和夫

出版者

Japan Society of Civil Engineers

雑誌

衛生工学研究論文集 (ISSN:09134069)

巻号頁・発行日

vol.27, pp.65-74, 1990-12-20 (Released:2010-03-17)

参考文献数

8

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An oxygen supply method to wastewater using gas permeable film in the form of tube was investigated for the purpose of reducing energy consumption for supplying oxygen. Oxygen transfer rate was measured in the case with or without biofilm, which proved the high rate of oxygen transfer with nitrifying biofilm supplied with ammonium substrate. Simultaneous nitrification and denitrification occurred, when the tube with nitrifying biofilm was applied to the treatment of wastewater, resulting in the high rate of organic matter removal. However, periodic sloughing of denitrifying biofilm which formed on the nitrifying biofilm was needed to keep the oxygen transfer rate high. Energy comsumptiom of the process using this tube was calculated to be less than 40% of that of the activated sluge process.