[Performance of phosphorus removal by simulated riparian zone enhanced with red mud treating reclaimed water]

The effect of red mud and the role of plants on the phosphorus removal of the reclaimed water were studied by lab-scale simulated riparian zone, which made well use of sintered red mud with well adsorption capacity for phosphorous due to its high contents of Ca, Al and Fe oxides. The results show that the suitable ratio range of adding red mud is 2.5%-5.0%, and correspondingly, the removal of phosphorus is as high as 82%-76%, resulting in 0.22-0. 29 mg/L of effluent TP concentration and 74%-75% of SRP/TP. When the percentage of adding red mud is 2.5%, comparing with the system without plants, the performance of the system with plants improves by 4%, reaching to 86% and 0. 17 mg/L of effluent TP concentration. Obviously, red mud can be directly used in the riparian zone to enhance the phosphorus removal as a new and cheap material.