Abstract: Both single factor and orthogonal experiments were used to explore the effect of the 5 factors，such as initial concen- tration of ammonium ion，pH，dosage of the aluminum tripolyphosphate，adsorption temperature，and time on the removal of ammonium ions.The best adsorption conditions were obtained，and adsorption kinetics of NH4+ on aluminum tripolyphosphate was also studied.The experimental results showed that the main influencing factors were in the order as follows：dosage of aluminum tripolyphosphate，temperature，initial concentration of ammonium ion，absorption time，pH.The optimum concentra- ions for adsorption of ammonium ions by aluminum tripolyphosphate in the solution were as follows：the initial concentration of ammonium ion was 50 mg/L，pH=4，the adsorbent dosage was 1.5 g，the adsorption temperature was 313 K，and the adsorption time was 70 min.The adsorption kinetics for ammonium by aluminum tripolyphosphate was in accordance with a third order reaction process under 298 K.The adsorption mechanism of aluminum dihydrogen tripolyphosphate for ammonium ions was discussed at the same time，which indicated that the main forms of NH4+ adsorption were surface adsorption and ion exchange with proton hydrogen in aluminum tripolyphosphate.

Key words: aluminum tripolyphosphate, ammonia nitrogen, absorption, kinetics