| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and an apparatus for high-speed biological treatment of organic sewage using fine solid particles such as sand. SOLUTION: In the method and the apparatus for the high-speed biological treatment of organic sewage, the organic sewage is treated in a biological treatment tank while fluidizing the fine solid particles to each of which a biomenbrane is stuck, then the biologically treated water containing the fine solid particles are discharged from the biological treatment tank. At least a polymer coagulant is added to the biologically treated water to form coagulated flocs including the fine solid particles, then the flocs are coagulated and sedimentated to obtain the clear treated water and the fine solid particles is recovered from the deposited sludge and returned to the biological treatment tank.</p> |
