Synthesis of polymerized lanthanum silicate flocculant for deep phosphate removal in high turbidity water
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.
PLSCcoagulationdeep phosphate removalkaolinhigh turbidity water
万方数据
维普
