| 摘要 |
PROBLEM TO BE SOLVED: To provide a waste water treatment device capable of preventing waste water containing heavy metal from being discharged by preventing discharge of the heavy metal to the downstream side of an insolubilization tank when the metal waste water treatment device is stopped.SOLUTION: A waste water treatment device 1 includes a pump P1, an oxidization tank 21 for oxidizing a complex formation compound contained in waste water W, an insolubilization tank 31 disposed on the downstream side of the oxidization tank 21 and insolubilizing heavy metal contained in the waste water Wflowing from the oxidizing tank 21, a membrane separation tank 42 disposed on the downstream side of the insolubilization tank 31 and subjecting waste water flowing from the insolubilization tank 31 to membrane separation treatment, and a stirrer 34 for stirring the waste water in the insolubilization tank 31. The oxidizing tank 21 and the insolubilization tank 31, and the insolubilization tank 31 and the membrane separation tank 42 are respectively connected by an overflow mechanism, and the stirrer 34 is stopped after a predetermined lapse of time from stopping of the pump. |
