To reduce power consumption by treating a waste water in the presence of equal to or below a specific value of protein concentration in the waste water to be treated to increase the removing efficiency of phosphate ion.
A high purity iron made electrode 5 is arranged in a water treating section 1 having a flow-in port 3 and a flow-out port 4 of the waste water 2 so as to be dipped into the waste water 2 and is connected to a power source 6. And a diffusion pipe 7 is arranged at the bottom of the treating section 1 and air is supplied from an aeration pump 8 to be bubbled. A quantity of current to the electrode 5 is, for example, controlled to 467mA so that Fe/P is 1.8 and for example, the polarity of the electrode 5 is reversed every 30min. Albumin is added in the waste water to be treated as the flocculation nucleus agent. In such a case, the waste water is treated in a state that the concentration of the protein in the waste water to be treated is ≤100mg/l.
MORIIZUMI MASAKI
YOSHIDA JUN
FUKUMOTO AKIHIRO
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