| 摘要 |
PROBLEM TO BE SOLVED: To provide a waste water treatment device, in which a device for removing phosphoric acid is incorporated, for dissolving stably electrodes and also informing simply the period of replacement of electrodes or the inspection of the electrodes for the purpose of maintenance or the like. SOLUTION: A dephosphorization device D1 is incorporated into a small combined treatment purifying tank 1 and provided with an elution tank 39, iron electrodes 40 and 41, a direct current power source 42 and a control section 43. Iron ions to react with phosphoric acid are eluted from the electrodes 40 and 41 by electrolysis. Electric current applied between the electrodes 40 and 41 is controlled by the control section 43. Also the dephosphorization device D1 is provided with an ion concentration sensing section 60 and an informing section 63. The ion concentration sensing section 60 is constituted of a sensing tank and a phosphate ion concentration sensor. When the concentration of phosphate ions sensed by the phosphate ion concentration sensor is beyond the given value, an instruction for turning an LED lamp on is issued to the informing section 63 by the control section 43. |
