Abstract
The amount of phosphate removal from the water by using Zenigamezawa volcanic soils was examined on the condition of phosphate in the river water which differed from water qualities. These removal values from the water of River Shinkawa increased with lapse of incubated time from 1 to 28 days.
Compared with the effect of water quality of Rivers Toyohira, Hassabu, and Shinkawa on such removal values, there were no clear differece among kinds of rivers. Conversely, the values of EC, Acidity, Alkalinity and COD in the Shinkawa were remarkably higher than that on the Toyohira and the Hassabu. These results suggest that the amount of phosphate removal are influenced by forms of dissolved phosphate rather than the water quality.
