| 摘要 |
<p>PURPOSE:To obtain a small-sized sewage purifying tank continuously and stably obtaining good treated water and reducing the amount of washing water by providing a biological reaction tank and a filter tank and successively transferring the water treated in a front stage process to the biological reaction tank and the filter tank. CONSTITUTION:In a biological reaction tank 4 at the time of purifying treatment, an aerobic condition is held by the emission of air from an air diffusing pipe 17 for aeration and the org. pollutant in water 7 to be treated is aerobically decomposed by the bacteria bound to a carrier 12. The water 7 to be treated issued from the biological reaction tank 14 flows downward or upward in a filter tank 15 to be filtered. In the filter tank 15 at the time of washing, the washing water from the biological reaction tank 14 flows downward or upward in the same way as the filtering state while air is emitted from an air diffusing pipe 19 for washing and discharged from a washing water discharge pipe 25 after washing.</p> |
