In view of the low efficiency of phosphate removal by polyaluminum chloride in the advanced treatment of high turbidity wastewater,a new efficient phosphorus removal agent-polymerized lanthanum silicate(PLSC),was designed.The characterization data showed that the part of silicon atoms in the molecular structure of polymerized silicic acid was replaced by lanthanum atoms to form the La-OH and Si-O-La groups,which further enhanced the phosphate removal efficiency.The experimental results showed that the pH,temperature and ionic strength of PLSC deep phosphorus removal in high turbidity water had a wide application range,showing high efficiency phosphorus removal behavior.The mechanism of phosphate removal by PLSC was analyzed by FTIR,Zeta potential and SEM-EDS,indicating that the La-OH group on the PLSC surface had a strong adsorption interaction on the phosphate,and the complexation mode of La-P was mainly double-toothed and double-nucleated.In the presence of kaolin,the complexation mode of La-P changed from two-tooth two-core to single-tooth single-core,which promoted the phosphate removal by PLSC.
关键词
聚合硅酸镧/絮凝/深度除磷/高岭土/高浊水
Key words
PLSC/coagulation/deep phosphate removal/kaolin/high turbidity water
维普
万方数据