| 摘要 |
PROBLEM TO BE SOLVED: To provide a system in which clean tertiary treated water having extremely high removal ratio of nutritive salts is obtained by merely installing the system downstream of a purifying device. SOLUTION: In a tertiary treatment system which communicates with the downstream side of a purifying device 2 to denitrify water to be treated, there are provided a denitrifying tank 1 in which a flow passage for the water to be treated is formed, a plurality of vanes 4 which are disposed on the surface of the water in the tank 1 along the flow passage and each of which has thereon a magnetized member and whose lower parts are dipped into the water to be treated, and a drive motor 3 for rotationally driving at least one of the vanes 4. |
