Adsorption of Nitrogen and Phosphorus on Natural Zeolite and its Influencing Factors

The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and phosphorus removal rate increased with the initial concentration; With the increasing of zeolite dosage and mesh of zeolite, the absorption efficacy on ammonia nitrogen and phosphorus is better; pH6-10, adsorption effect of ammonia nitrogen on natural zeolite is good, are more than 70%, pH<;5, zeolite removal on phosphorus increase with the decreases of pH. In alkaline conditions, the removal of phosphorus increase, because that the PO₄^2- may form precipitate with Ca²⁺ or Ba²⁺ in solution.