| 摘要 |
PURPOSE:To provide a sewage treating device with the coloration of treated water reduced and without the malodor being developed from the device. CONSTITUTION:Sewage is treated by an aerobic treating stage and a membrane separation stage. In this case, ozone is introduced into the sewage by 0.1-0.9mg per liter of sewage, and aerobic treatment is carried out. An ozonized air feeder 3 is connected to the lower part of an aerobic treating tank 1, the inlet of a membrane separator 2 or a concd. liq. line to supply the ozonized air or a part of the treated water for the separator 2 is introduced into an electrolytic ozonizer 8, and the ozonized water is supplied to the tank 1 along with raw water. The ozone concn. in the tank 1 is automatically controlled. Accordingly, the treated water is hardly colored, and the treated water free of malodors is easily obtained. |
