| 摘要 |
<p>PROBLEM TO BE SOLVED: To accurately purify raw water at a low running cost while slowly recirculating the water and to manufacture the water purifier with a compact configuration at a low cost. SOLUTION: This raw water purifier is formed by connecting a raw water tank 2 for transiently storing raw water to the plural treating tanks, i.e., a first treating tank 5, a second treating tank 6, a third treating tank 4, etc., for biologically treating the raw water in stages arranged in this order from the raw water feed side. Further, a main aeration tank 2a for aerating the raw water is set between the raw water tank 2 and the first treating tank 5, water is sent to the main aeration tank 2a from the raw water tank 2 by a suction pump 3P, the water is discharged from the main aeration tank 2a to the treating tanks on the downstream side and from the raw water tank 2 by the head, and the raw water is circulated through the tanks and purified.</p> |
