| 摘要 |
<p>PURPOSE:To efficiently perform flocculation treatment and biological treatment, by mixing the solid component, obtained by the solid-liquid separation of the sludge in a purification tank, with excretion sewage and applying flocculation treatment to the resulting mixture while subjecting the separated solution by said treatment to biological treatment. CONSTITUTION:The solid component, which is obtained by the solid-liquid separation of the sludge from a purification tank, is mixed with excretion sewage and flocculation treatment is applied to the resulting mixture. The sludge of the purification tank can be subjected to solid-liquid separation as it is without adding a flocculant. Flocs formed by flocculation receives solid-liquid separation by a solid-liquid separation means such as a precipiration tank, a pressure floating tank or a dehydrator. The separated solution obtained by solid-liquid separation is mixed with the separated solution separated by the solid-liquid separation of the sludge of the purification tank to perform biological treatment. As a biological treatment method, a general activated sludge treatment method by a floating microorganism and its modified method and a fluidized bed method for performing treatment by fluidizing a particulate carrier having activated sludge adhered thereto can be employed.</p> |
