Abstract:

Four kinds of adsorption materialsscoria, bone char, ash and manganese sand were used to remove F^- and SO^2-₄ in water. The research results show that adsorption capacities of scoria and bone char for F^- were 0.092，0.041 mg/g; adsorption capacities of them for SO^2-₄were 5.72,3.99 mg/g. Adsorption capacities of ash and manganese sand for F^- were both below 0.020 mg/g. AndSO^2-₄ was almost not adsorbed by them. Modification was applied in scoria and bone char because of their good adsorption effects. The research results show that Al₂(SO₄)₃ could be used as modifier. Adsorption capacity of scoria which was soaked in 10% Al₂(SO₄)₃ then calcinated at 300 ℃ was the maximum 0.099 mg/g. Adsorption capacity of scoria which was soaked in 10% Al₂(SO₄)₃ was the maximum 5.93 mg/g. Adsorption kinetics of them both followed quasi-secondary dynamics equation.

Key words: fluoride removal, sulfate removal, adsorption materials, modified material