| 摘要 |
PURPOSE:To perfectly remove the contaminant, especially, ammonia nitrogen contained in raw water is clean water. CONSTITUTION:Raw clean water is biologically treated in a nitration tank 1, a denitrification tank 2 and a sedimentation filter tank 6 in succession. Saddle-shaped ceramics are provided in the nitration tank 1 and the denitrification tank 2 as a bacteria immobilizing carrier. Oxygen enriched air is supplied to the nitration tank 1 from an oxygen enriched air preparing device 3 to perform nitration treatment under the control of ORP. By controlling ORP by supplying oxygen enriched air to the denitrification tank 2 from the oxygen enriched air preparing device 3, denitrification treatment is performed. The flocculation, sedimentation and filtration of bacteria are performed in the sedimentation filter tank 6. |
