Abstract: Taking scoria as an adsorbent material, we studied its adsorption effect on SO^2-₄ in low temperature water and its influence factors. The experimental results show that the scoria has a good adsorption effect onSO^2-₄. When the initial mass concentration of SO^2-₄ is 100—1 000 mg/L, the adsorption amount increases with the increase of the initial mass concentration. When ρ（SO^2-₄）=1 000 mg/L, the maximum adsorption amount is 6.42 mg/g, and the shortest equilibrium time is 4 h. The optimum pH for adsorption of SO^2-₄ is 7. Ca^2+ and Mg²⁺ have a slight promoting effect on SO^2-₄ adsorption by scoria, while Cl^- and NO^-₃ have inhibitory effect.

Key words: scoria, adsorption effect； low temperature water, sulfate ion, influence factor