| 摘要 |
<p>PURPOSE:To make the maintenance control easy and to improve the treating efficiency, by changing the arrangement density and interval of contact material corresponding to BOD concentration of influent waste water. CONSTITUTION:Clogging of the contact material 7 by the living things film sludge, is prevented by lowering the density of the material 7 by enlarging the inserting arrangement space of the contact material frame 6 or enlarging stretching space of the material 7, because waste water flowing in the first oxidation vessel 1, has a highest BOD concentration. The waste water is sent to the second oxidation vessel 3 after separating the mixed sludge in the first sludge separation vessel 2. BOD concentration is decreased in order of the second oxidation vessel 3 and the third oxidation vessel 5 and the clogging is difficult to happen and then, a high grade treatment is carried out by heightening the density of the material 7 and narrowing the space. Further, the sludge mixed in the waste water, is separated by providing the sludge separation vessel 4 between the second oxidation vessel 3 and the third oxidation vessel 5 when BOD concentration of the original waste water is high.</p> |
