| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently treat a waste water to be directly discharged in sewerage in accordance with the properties of the water without need for any process or equipment like the conventional activated-sludge treatment and with an extremely simple structure. SOLUTION: A treating tank 1 into which raw water is injected is separated by a partition 4 with a water passage 5 formed at the intermediate part positioned at a specified distance from the tank bottom and water surface into a primary treating part 2 and a secondary treating part 3. In the primary treating part 2, a superfine bubble is blown up from the lower part, hence the grease and grease decomposing bacteria are floated up and retained, the retained grease is decomposed by the bacteria, and the treated water at the intermediate part of the primary treating part 2 is introduced into the secondary treating part 3 through the water passage 5 of the partition 4. In the secondary treating part 3, the primarily treated water is agitated, one part of the treated water is returned to the treating tank 1, and the other part is discharged from the tank bottom.</p> |
