Abstract
In this study, the material properties and adsorption characteristics of the adsorption material which consists of volcanic ash soil heated with ferrous sulfate (VASHF) are examined. VASHF simultaneously has cation exchange capacity and anion exchange capacity. Moreover, even though its hardness is less than that of sand, its durability to beating and water reverse washing is high, and it has sufficient physical strength to act as a filtration material. The adsorption rate of VASHF is very high. VASHF shows a high amount of phosphorus adsorption from the low-concentration stage to the high-concentration stage, and the amount of phosphorus adsorption is 8.1-22.3mgP·g-1(168h). Additionally, it can efficiently reduce the amount of phosphate, tripolyphosphate and phosphite ions, however, it can hardly reduce the amount of phosphinate monohydrate ions. The lower the pH is, the higher the removal rate of those forms of phosphorus that can be achieved with pH5.0-9.0, Coexisting with AsO43- 5.0mgAs·l-1, F- 20.0mg·l-1, Cl- and SO42- 200.0mg·l-1 and SiO42- 50.0mgSi·l-1, it is found out that VASHF did not influence phosphorus removal. Finally, highly effective phosphorus removal is verified by the phosphorus removal experiment of the column and the secondary effluent.
