| 摘要 |
<p>PROBLEM TO BE SOLVED: To obviate the need for a space on the floor for the devices other than a settling tank by allowing a sludge settled and separated in a settling tank on the floor to flow down into a digestion tank by gravity, returning the settled sludge in the digestion tank to a reaction tank and discharging the supernatant liq. from the settling tank. SOLUTION: A settling tank 4 is arranged on the floor, and a storage tank 2, a first reaction tank 3 and a digestion tank 5 are set under the floor. An org. waste water is transferred to the first reaction tank 3 from the storage tank 2 by a pump P1, the waste water is transferred to the settling tank 4 by a pump P2, the waste water in the settling tank 4 is separated into a clear supernatant liq. and the settled sludge, the supernatant liq. is discharged outside the system, and the settled sludge is allowed to flow out into the digestion tank 5 by gravity. Aerobic digestion is conducted in the digestion tank 5 by the air diffused from a diffuser D2, and then the sludge settled in the digestion tank 5 is returned to the first reaction tank 3 through a pump P3. Accordingly, the space on the floor for the devices other than the settling tank 4 is not needed.</p> |
