PROBLEM TO BE SOLVED: To provide a flotation separation method for treating organic waste water by allowing minute bubbles to effectively contact the organic waste water containing a foaming component such as a surface active agent.SOLUTION: The method comprises a diffuser 7 disposed in a separation tank 1 to produce bubbles 11 and a self-sufficient minute bubble generator 6 disposed above the diffuser 7 to produce minute bubbles 12, allowing the minute bubbles 12 to shear off and miniaturize the bubble 11 to supply a large number of minute bubbles to the organic waste water 2. The foaming component in the organic waste water 2 rises up as bubbles 13 with the help of the minute bubbles 12 to be discharged as foam-separated water 3 while the water left in the separation tank 1 separated from the bubbles 13 is obtained as treated water 4. The amount of the air supplied to the separation tank 1 is determined on the basis of the horizontal cross sectional area of the separation tank 1.COPYRIGHT: (C)2007,JPO&INPIT【課題】界面活性剤等の発泡成分を含む有機性廃水に微細気泡を効率よく接触させて処理する浮上分離処理方法を提供する。【解決手段】分離槽1内に設置した散気板7より気泡11を発生させ、該散気板7よりも上方に設置した自給式微細気泡発生装置6より微細気泡12を発生させ、該微細気泡12により気泡11を剪断して微細化することにより、大量の微細気泡を有機性廃水2に供給し、有機性廃水2に含まれる発泡成分を該微細気泡12によって泡沫13として上昇させ、泡沫分離水3として排出する一方、泡沫13が除去された槽内水を処理水4として得る浮上分離処理方法において、分離槽1内に供給する空気量を分離槽1の水平断面積に基づいて設定する。【選択図】図1
