[Objective]The study aimed to discuss the removal rate of phosphorus by different constructed wetland substrates.[Method]Based on static experiments,we analyzed the removal rate and characteristics of phosphorus by different constructed wetland substrates like steel slag,cinder slag,shale,boiler slag,soil and gravel.[Result]The maximum adsorption of phosphorus by various substrates showed as follows:steel slag >cinder slag >shale >boiler slag >soil >gravel.When the initial concentration of phosphorus was 5 mg/L,the removal rate of phosphorus by the steel slag,cinder slag,shale,boiler slag,soil and gravel was 99.76%,85.8%,71.2%,63.0%,46.8% and 11.7% respectively.It is suggested that shale and boiler slag can be used as the substrate of subsurface-flow constructed wetlands;cinder slag can be chosen as a renewable substrate for intensifying phosphorus removal;steel slag could be used at the end of subsurface-flow constructed wetlands for treating TP in outflows.[Conclusion]The research could provide theoretical references for choosing a suitable substrate for constructed wetlands to remove phosphorus in future.
