| 摘要 |
An electroless nickel plating waste liquid (4) accommodated in an electrolytic oxidation tank (2) is treated by electrolytic oxidation with vibrating and fluidizing the waste liquid by means of an oscillating stirrer (10) to recover nickel by the electrolytic oxidation as well as recover the waste liquid in which an active component for fertilizer including phosphorus remains as a fertilizer solution. When the waste liquid is neutralized by a neutralizer including an active component for fertilizer such as potassium, nitrogen, etc., the fertilizer solution having higher content of the active component is obtained. The oscillating stirrer comprises an oscillation generator including a 25 to 500 Hz oscillating motor (18), an oscillating rod (22) connected to the oscillation generator, and multistage oscillating vanes (38) attached to the oscillating rod, and the oscillating vane is such that a tip end portion of the vane is fluttered when an oscillation is transmitted from the oscillating rod to the vane.
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