Abstract: In view of the problems that the high concentration of phosphate remained in secondary effluent, and combining with the related research at home and abroad, adsorption processes were attempted to remove phosphate, which used the  inexpensive natural zeolite as basic materials, the lanthanum ion as inorganic loading ion, loading dose of lanthanum chloride as the inorganic loading dose to compoundly treat Zeolite.After treatment, the removal capacity of phosphate by zeolite reached 83.83 %.The appropriate composite conditions were pH=10, 0.4% of LaCl3 concentration, compound time of 1 h, 200 ℃ of calcined temperature for 1 h.Compared with the power function, Elovich absorption kinetic equation could more clearly describe the absorption mechanism in phosphorus removal process by the composite  adsorbent.Through the contrast analysis by scanning electron microscope, it is shown that in the preparation of composite adsorbent process, the surface morphology and micro-pore size of zeolite and its shape have been changed.

Key words: Adsorption, Compound, Phosphate, Zeolite