A study on modified diatomite treatment the wastewater of ammonia nitrogen

Through the choose of inorganic flocculants (Ferrous sulfate (FS)) and the organic polymer flocculant (PAM) of diatomite was modified, using modified diatomite to treat ammonia-nitrogen wastewater. The experiment indicated that adsorption process of modification of the type and dosage, diatomite consumption, pH, in the initial concentration of ammonia solution is the impact of ammonia adsorption of the main factors. In a certain range, diatomite modified to increase the dosage to extend the absorption of time and increase the pH value can improve the removal of ammonia. Through modification experiments by raising the capacity of diatomite adsorption ammoniacal nitrogen, adsorption of ammoniacal nitrogen increase over one time. Langmuir and Freundlich isotherms were used to fit, and the experimental results show that the modified diatomite adsorption onto ammoniacal nitrogen accords with Langmuir and Freundlich isotherm. The maximum theoretical adsorption capacities are 10.062mg/g and 8.056mg/g.