[Objective] The study aimed to discuss the optimal conditions for the treatment of wastewater containing low concentration of phosphorus by modified slag. [Method] Modified slag by hydrochloric acid was used to treat wastewater containing low concentration of phosphorus,and the effects of p H,dosage of the modified slag,reaction time and temperature on the removal effect of phosphorus were analyzed. Moreover,the mechanism of phosphorus removal by the modified slag was discussed. [Result] When the wastewater...