Experimental Study on Ammonia-Nitrogen Removal in Water by Modified Zeolite

In this paper,the removal efficiency of ammonia-nitrogen with modified zeolite and natural zeolite is studied by static adsorption experiment of ammonia-nitrogen under the different concentrations of ammonia-nitrogen.HCl,NaOH,NaCl and AlCl3 are respectively adopted to modify the natural zeolite.We compared the removal rates of ammonia-nitrogen and adsorption capacity of these four different types of modified zeolite and natural zeolite by static adsorption experimentation.The results show that the removal efficiency of NaCl modified zeolite is the best,and its removal rate can reach 93.28%.The HCl modified zeolite is better and the NaOH modified zeolite follows it,the natural zeolite's is worse,but the AlCl3 modified zeolite is the worst.The regularity of ammonia-nitrogen absorption by NaCl modified zeolite conforms to the Langmuir isothermal adsorption model.The dosage of NaCl modified zeolite and agitation time contribute to the removal efficiency of ammonia-nitrogen,too.The optimal dosage is 0.5 g and the optimal agitation time is 30 min.Therefore,it is safe to draw the conclusion that NaCl modified zeolite can effectively improve the adsorption capacity of the natural zeolite,and its removal efficiency of ammonia-nitrogen is much better than that of the natural zeolite.