抄録
To synthesize a high-performance phosphorus adsorbent suitable for wastewater treatment, ferrous sulfate was mixed with volcanic ash soil, brown forest soil or red soil and then heated. We inspected the phosphorus adsorption ability and the various characteristics of soils heated with ferrous sulfate, and examined the phosphorus adsorption mechanism. The results are as follows. The phosphorus adsorption ability, active iron (Feo), active aluminum (Alo), free iron (Fed) and free aluminum (Ald) levels of the three soil types increased markedly. The specific surface area of the three soil types decreased markedly upon heating with ferrous sulfate. The silicon level extracted using oxalate extration solution (Sio) increased in the volcanic ash soil heated with ferrous sulfate where as in brown forest soil and red soil the silicon level decreased markedly upon heating with ferrous sulfate. We showed that the phosphorus adsorption abilities of the three soil types with and without ferrous sulfate positively correlated with Feo, Alo, Fed and Ald levels; while they were not correlated with specific surface area and Sio.
