Removal characteristics of hypophosphorous and phosphorous ions in electroless nickel plating waste solution have been studied using two kinds of Yatugatake volcanic ash soils, which were named as Y-1 and Y-2.
The results obtained are as follows.
1) Y-2 is found to be allophane and Y-1 is the mixed systems of SiO
2, Al
2O
3, and Fe
2O
3 components.
2) Hypophosphorous and phosphorous ions in solution were both easily removed to Y-1 and Y-2 soils but the removal ratio decreased with increasing PH values from 3 to 10.
3) Removal behavior of hypophosphorous and phosphorous ions is influenced by cations in solution.
4) It was observed that removal ratio of hypophosphorous and phosphorous ions is increased by the saturated treatment with Fe ions.
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