Abstract:The low-cost P zeolite was synthesized from coal fly ash of power plants through the modified hydrothermal process, and further treated through the tombarthite La modification to improve its ammonium and phosphate removal efficiency. The experiments focused on testing the impact of modified lanthanum concentration, dosage, pH on ammonium and phosphate removal. X-ray diffraction (XRD) and scanning electronic microscope (SEM) were applied to observe the physical-chemical characteristics. Removal rate of ammonium and phosphate were 90%, 95% respectively under the conditions of lanthanum concentration at 0.5%, pH 4~8, and the dosage of 10g / L. The adsorption process of ammonium and phosphate was in accord with pseudo-second-order kinetic model. The equilibrium adsorption data were fitted to Langmuir isotherms and the maximum adsorption capacity of ammonium and phosphate were 3.94 ,1.65 mg/g respectively.
王宇, 谌建宇, 李小明, 骆其金, 杨麒, 蒋丽. 镧改性粉煤灰合成沸石的同步脱氨除磷研究[J]. 中国环境科学, 2011, 31(7): 1152-1158.
WANG Yu, CHEN Jian-Yu, LI Xiao-Ming, LUO Qi-Jin, YANG Qi, JIANG Li. Stimultaneous removal of ammonium and phosphate in waste water by La-modified synthetic zeolite from coal fly ash. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(7): 1152-1158.